Features
•3000 Dhrystone 2.1 MIPS at 1.3 GHz
•Selectable Bus Clock (30 CPU Bus Dividers up to 28x)
•13 Selectable Core-to-L3 Frequency Divisors
•Selectable MPx/60x Interface Voltage (1.8V, 2.5V)
•Selectable L3 Interface of 1.8V or 2.5V
•PD Typical 12.6W at 1 GHz at VDD = 1.3V; 8.3W at 1 GHz at VDD = 1.1V, Full Operating
Conditions
•Nap, Doze and Sleep Modes for Power Saving
•Superscalar (Four Instructions Fetched Per Clock Cycle)
•4 GB Direct Addressing Range
•Virtual Memory: 4 Hexabytes (252)
•64-bit Data and 36-bit Address Bus Interface
•Integrated L1: 36 KB Instruction and 32 KB Data Cache
•Integrated L2: 512 KB
•11 Independent Execution Units and Three Register Files
•Write-back and Write-through Operations
•fINT Max = 1 GHz (1.2 GHz to be Confirmed)
•fBUS Max = 133 MHz/166 MHz
Description
This document is primarily concerned with the PowerPC PC7457; however, unless
otherwise noted, all information here also applies to the PC7447. The PC7457 and
PC7447 are implementations of the PowerPC microprocessor family of reduced
instruction set computer (RISC) microprocessors. This document describes pertinent
electrical and physical characteristics of the PC7457.
The PC7457 is the fourth implementation of the fourth generation (G4) microproces-
sors from Freescale. The PC7457 implements the full PowerPC 32-bit architecture
and is targeted at networking and computing systems applications. The PC7457 con-
sists of a processor core, a 512 Kbyte L2, and an internal L3 tag and controller which
support a glueless backside L3 cache through a dedicated high-bandwidth interface.
The PC7447 is identical to the PC7457 except it does not support the L3 cache
interface.
The core is a high-performance superscalar design supporting a double-precision
floating-point unit and a SIMD multimedia unit. The memory storage subsystem sup-
ports the MPX bus interface to main memory and other system resources. The L3
interface supports 1, 2, or 4M bytes of external SRAM for L3 cache and/or private
memory data. For systems implementing 4M bytes of SRAM, a maximum of 2M bytes
may be used as cache; the remaining 2M bytes must be private memory.
Note that the PC7457 is a footprint-compatible, drop-in replacement in a PC7455
application if the core power supply is 1.3V.
PowerPC®
7447/7457
PC7447/57
Preliminary
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Screening
• CBGA Upscreenings Based on Atmel Standards
• Full Military Temperature Range (Tj = -55°C, +125°C),
Industrial Temperature Range (Tj = -40°C, +110°C)
• HCTE Package for the 7457
G suffix
CBGA 360
Ceramic Ball Grid Array
GH suffix
HITCE 483
Ceramic Ball Grid Array
CBGA 483
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1. Block Diagram
Figure 1-1. PC7457 Microprocessor Block Diagram
+
Integer
Reservation
Station
Unit 2
+
Integer
Reservation
Station
Unit 2
Additional Features
- Time Base Counter/Decrementer
- Clock Multiplier
- JTAG/COP Interface
- Thermal/Power Management
- Performance Monitor
PA
Instruction Unit Instruction Queue
(12-Word)
96-Bit (3 Instructions)
Reservation
128-Bit (4 Instructions)
32-Bit
FPSCR
FPSCR
+ x ÷
Floating-
Point Unit
64-Bit
Reservation
32-Bit
Completion Unit
Completion Queue
(16-Entry)
32-Kbyte
D Cache
36-Bit 64-Bit
Stations (2)
Station
Reservationv
Stations (2) FPR File
16 Rename
Buffers
Stations (2-Entry)
GPR File
16 Rename
Buffers
Reservation
Station
VR File
16 Rename
Buffers
64-Bit
128-Bit
Completes up
Instruction MMU
SRs 128-Entry
IBAT Array
ITLB Tags 32-Kbyte
I Cache
Vector
Touch
Queue
VR Issue FPR Issue
Branch Processing Unit
CTR
LR
BTIC (128-Entry)
BHT (2048-Entry)
Fetcher
GPR Issue
(6-Entry/3-Issue) (4-Entry/2-Issue) (2-Entry/1-Issue)
Dispatch
Unit Data MMU
SRs
(Original) 128-Entry
DBAT Array
DTLB
32-Bit
EA
Status
L2 Store Queue (L2SQ)
Vector
FPU
Reservation
Station
Reservationv
Station
Reservation
Station
Vector
Integerer
Unit 1
Vector
Integerer
Unit 2
Vector
Permute
Unit
Line
Tags Block 0 (32-Byte) Status
Block 1 (32-Byte)
Memory Subsystem
Snoop Push/
Interventions
L1 Castouts
Bus Accumulator
(4)
x ÷
Integer
Unit 2
to three
per clock
instructions
L1 Load Queue (LLQ)
L1 Load Miss (5)
Cacheable Store Request(1)
L1 Service
L1 Store Queue
(LSQ)
L3 Cache Controller(1)
L3CR
StatusTags
Bus Accumulator
Block 0/1
Line
System Bus Interface
L2 Prefetch (3)
64-Bit Data
(8-Bit Parity)
External SRAM
Address Bus Data Bus
Queues
Castout
Bus Store Queue
Push
Load
Queue (11)
Queue (9)/
Queue (10)(2)
Notes: 1. The L3 cache interface is not implemented on the PC7447.
2. The Castout Queue and Push Queue share resources such for a combined total of 10 entries.
The Castout Queue itself is limited to 9 entries, ensuring 1 entry will be available for a push.
512-Kbyte UniÞed L2 Cache Controller
19-Bit Address
(1, 2, or 4 Mbytes)
Tags
Instruction Fetch (2)
128-Bit
Reservation
(Shadow)
+
Load/Store Unit
(EA Calculation)
Finished
Completed
Stores
Stores
Load Miss
L1 Castout
L1 Push
Vector Touch Engine
+
Integer
(3)
Unit 1
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2. General Parameters
Table 2-1 provides a summary of the general parameters of the PC7457.
3. Overview
This section summarizes features of the PC7457 implementation of the PowerPC architecture.
Major features of the PC7457 are as follows:
• High-performance, superscalar microprocessor
– As many as 4 instructions can be fetched from the instruction cache at a time
– As many as 3 instructions can be dispatched to the issue queues at a time
– As many as 12 instructions can be in the instruction queue (IQ)
– As many as 16 instructions can be at some stage of execution simultaneously
– Single-cycle execution for most instructions
– One instruction per clock cycle throughput for most instructions
– Seven-stage pipeline control
• Eleven independent execution units and three register files
– Branch processing unit (BPU) features static and dynamic branch prediction
128-entry (32-set, four-way set-associative) branch target instruction cache (BTIC),
a cache of branch instructions that have been encountered in branch/loop code
sequences. If a target instruction is in the BTIC, it is fetched into the instruction
queue a cycle sooner than it can be made available from the instruction cache.
Typically, a fetch that hits the BTIC provides the first four instructions in the target
stream
2048-entry branch history table (BHT) with two bits per entry for four levels of
prediction – not-taken, strongly not-taken, taken, and strongly taken
Up to three outstanding speculative branches
Branch instructions that don’t update the count register (CTR) or link register (LR)
are often removed from the instruction stream
Table 2-1. Device Parameters
Parameter Description
Technology 0.13 µm CMOS, nine-layer metal
Die size 9.1 mm × 10.8 mm
Transistor count 58 million
Logic design Fully-static
Packages PC7447: surface mount 360 ceramic ball grid array (CBGA)
PC7457: surface mount 483 ceramic ball grid array (CBGA) + HiTCE CBGA
Core power supply 1.3V ±500 mV DC nominal or 1.1V ±50 mV (nominal, see ”Recommended
Operating Conditions(1)” on page 12
I/O power supply 1.8V ±5% DC, or 2.5V ±5% for recommended operating conditions
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Eight-entry link register stack to predict the target address of Branch Conditional to
Link Register (BCLR) instructions
– Four integer units (IUs) that share 32 GPRs for integer operands
Three identical IUs (IU1a, IU1b, and IU1c) can execute all integer instructions except
multiply, divide, and move to/from special-purpose register instructions
IU2 executes miscellaneous instructions including the CR logical operations, integer
multiplication and division instructions, and move to/from special-purpose register
instructions
– Five-stage FPU and a 32-entry FPR file
Fully IEEE 754-1985-compliant FPU for both single- and double-precision
operations
Supports non-IEEE mode for time-critical operations
Hardware support for denormalized numbers
Thirty-two 64-bit FPRs for single- or double-precision operands
– Four vector units and 32-entry vector register file (VRs)
Vector permute unit (VPU)
Vector integer unit 1 (VIU1) handles short-latency AltiVec™ integer instructions, such
as vector add instructions (vaddsbs, vaddshs, and vaddsws, for example)
Vector integer unit 2 (VIU2) handles longer-latency AltiVec integer instructions, such
as vector multiply add instructions (vmhaddshs, vmhraddshs, and vmladduhm, for
example)
Vector floating-point unit (VFPU)
– Three-stage load/store unit (LSU)
Supports integer, floating-point, and vector instruction load/store traffic
Four-entry vector touch queue (VTQ) supports all four architected AltiVec data
stream operations
Three-cycle GPR and AltiVec load latency (byte, half-word, word, vector) with one-
cycle throughput
Four-cycle FPR load latency (single, double) with one-cycle throughput
No additional delay for misaligned access within double-word boundary
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Dedicated adder calculates effective addresses (EAs)
Supports store gathering
Performs alignment, normalization, and precision conversion for floating-point data
Executes cache control and TLB instructions
Performs alignment, zero padding, and sign extension for integer data
Supports hits under misses (multiple outstanding misses)
Supports both big- and little-endian modes, including misaligned little-endian
accesses
• Three issue queues FIQ, VIQ, and GIQ can accept as many as one, two, and three
instructions, respectively, in a cycle. Instruction dispatch requires the following:
– Instructions can be dispatched only from the three lowest IQ entries – IQ0, IQ1, and
IQ2
– A maximum of three instructions can be dispatched to the issue queues per clock
cycle
– Space must be available in the CQ for an instruction to dispatch (this includes
instructions that are assigned a space in the CQ but not in an issue queue)
• Rename buffers
– 16 GPR rename buffers
– 16 FPR rename buffers
– 16 VR rename buffers
• Dispatch unit
– Decode/dispatch stage fully decodes each instruction
• Completion unit
– The completion unit retires an instruction from the 16-entry completion queue (CQ)
when all instructions ahead of it have been completed, the instruction has finished
execution, and no exceptions are pending
– Guarantees sequential programming model (precise exception model)
– Monitors all dispatched instructions and retires them in order
– Tracks unresolved branches and flushes instructions after a mispredicted branch
– Retires as many as three instructions per clock cycle
• Separate on-chip L1 Instruction and data caches (Harvard Architecture)
– 32 Kbyte, eight-way set-associative instruction and data caches
– Pseudo least-recently-used (PLRU) replacement algorithm
– 32-byte (eight-word) L1 cache block
– Physically indexed/physical tags
– Cache write-back or write-through operation programmable on a per-page or per-
block basis
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– Instruction cache can provide four instructions per clock cycle; data cache can
provide four words per clock cycle
– Caches can be disabled in software
– Caches can be locked in software
– MESI data cache coherency maintained in hardware
– Separate copy of data cache tags for efficient snooping
– Parity support on cache and tags
– No snooping of instruction cache except for icbi instruction
– Data cache supports AltiVec LRU and transient instructions
– Critical double- and/or quad-word forwarding is performed as needed. Critical quad-
word forwarding is used for AltiVec loads and instruction fetches. Other accesses
use critical double-word forwarding
• Level 2 (L2) cache interface
– On-chip, 512 Kbyte, eight-way set-associative unified instruction and data cache
– Fully pipelined to provide 32 bytes per clock cycle to the L1 caches
– A total nine-cycle load latency for an L1 data cache miss that hits in L2
– PLRU replacement algorithm
– Cache write-back or write-through operation programmable on a per-page or per-
block basis
– 64-byte, two-sectored line size
– Parity support on cache
• Level 3 (L3) cache interface (not implemented on PC7447)
– Provides critical double-word forwarding to the requesting unit
– Internal L3 cache controller and tags
– External data SRAMs
– Support for 1, 2, and 4M bytes (MB) total SRAM space
– Support for 1 or 2 MB of cache space
– Cache write-back or write-through operation programmable on a per-page or per-
block basis
– 64-byte (1 MB) or 128-byte (2 MB) sectored line size
– Private memory capability for half (1 MB minimum) or all of the L3 SRAM space for a
total of 1-, 2-, or 4-MB of private memory
– Supports MSUG2 dual data rate (DDR) synchronous Burst SRAMs, PB2 pipelined
synchronous Burst SRAMs, and pipelined (register-register) Late Write synchronous
Burst SRAMs
– Supports parity on cache and tags
– Configurable core-to-L3 frequency divisors
– 64-bit external L3 data bus sustains 64-bit per L3 clock cycle
• Separate memory management units (MMUs) for Instructions and data
– 52-bit virtual address; 32- or 36-bit physical address
– Address translation for 4 Kbyte pages, variable-sized blocks, and 256M bytes
segments
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– Memory programmable as write-back/write-through, caching-inhibited/caching-
allowed, and memory coherency enforced/memory coherency not enforced on a
page or block basis
– Separate IBATs and DBATs (eight each) also defined as SPRs
– Separate instruction and data translation lookaside buffers (TLBs)
Both TLBs are 128-entry, two-way set-associative, and use LRU replacement
algorithm
TLBs are hardware- or software-reloadable (that is, on a TLB miss a page table
search is performed in hardware or by system software)
• Efficient data flow
– Although the VR/LSU interface is 128 bits, the L1/L2/L3 bus interface allows up to
256 bits
– The L1 data cache is fully pipelined to provide 128 bits/cycle to or from the VRs
– L2 cache is fully pipelined to provide 256 bits per processor clock cycle to the L1
cache
– As many as eight outstanding, out-of-order, cache misses are allowed between the
L1 data cache and L2/L3 bus
– As many as 16 out-of-order transactions can be present on the MPX bus
– Store merging for multiple store misses to the same line. Only coherency action
taken (address-only) for store misses merged to all 32 bytes of a cache block (no
data tenure needed)
– Three-entry finished store queue and five-entry completed store queue between the
LSU and the L1 data cache
– Separate additional queues for efficient buffering of outbound data (such as castouts
and write-through stores) from the L1 data cache and L2 cache
• Multiprocessing support features include the following:
– Hardware-enforced, MESI cache coherency protocols for data cache
– Load/store with reservation instruction pair for atomic memory references,
semaphores, and other multiprocessor operations
• Power and thermal management
– 1.6V processor core
– The following three power-saving modes are available to the system:
Nap—Instruction fetching is halted. Only those clocks for the time base,
decrementer, and JTAG logic remain running. The part goes into the doze state to
snoop memory operations on the bus and then back to nap using a QREQ/QACK
processor-system handshake protocol
Sleep—Power consumption is further reduced by disabling bus snooping, leaving
only the PLL in a locked and running state. All internal functional units are disabled
Deep sleep—When the part is in the sleep state, the system can disable the PLL.
The system can then disable the SYSCLK source for greater system power savings.
Power-on reset procedures for restarting and relocking the PLL must be followed on
exiting the deep sleep state
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– Thermal management facility provides software-controllable thermal management.
Thermal management is performed through the use of three supervisor-level
registers and a PC7457-specific thermal management exception
– Instruction cache throttling provides control of instruction fetching to limit power
consumption
• Performance monitor can be used to help debug system designs and improve software
efficiency
• In-system testability and debugging features through JTAG boundary-scan capability
• Testability
– LSSD scan design
– IEEE 1149.1 JTAG interface
– Array built-in self test (ABIST) – factory test only
• Reliability and serviceability
– Parity checking on system bus and L3 cache bus
– Parity checking on the L2 and L3 cache tag arrays
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4. Signal Description
Figure 4-1. PC7457 Microprocessor Signal Groups
Notes: 1. For the PC7457, there are 19 L3_ADDR signals, (L3_ADDR[0:18].
2. For the PC7447 and PM7457, there are 5 PLL_CFG signals, (PLL_CFG[0:4].
18
64
8
1
2
4
2
1
1
1
1
1
1
1
1
1
1
1
2
1
1
1
4
1
1
1
1
1
1
1
1
PC7457
L3_ADDR[17:0](1)
L3-DATA[0:63]
L3_DP[0:7]
L3_VSEL
L3_CLK[0:1]
L3_ECHO_CLK[0:3]
L3_CNTL[0:1]
INT
SMI
MCP
SRESET
HRESET
CKSTP_IN
CKSTP_OUT
TBEN
QREQ
QACK
BVSEL
BMODE[0:1]
PMON_IN
PMON_OUT
SYSCLK
PLL_CFG[0:3](2)
PLL_EXT
EXT_QUAL
CLK_OUT
TCK
TDI
TDO
TMS
TRST
BR
BG
A[0:35]
AP[0:4]
TS
TT[0:4]
TBST
TSIZ[0:2]
GBL
WT
CI
AACK
ARTRY
SHD0/SHD1
HIT
DBG
DTI[0:3]
DRDY
D[0:63]
DP[0:7]
TA
TEA
1
1
36
5
1
5
1
3
1
1
1
1
1
2
1
1
4
1
64
8
1
1
Address
Arbitration
Address
Transfer
Address
Transfer
Attributes
Address
Transfer
Termination
Data
Arbitration
Data
Transfer
Data
Transfer
Termination
L3 Cache
Address/Data
L3 Cache
Clock/Control
Interrupts/Resets
Processor
Status/Control
Clock Control
Test Interface
(JTAG)
AVDD
GND
VDD
OVDD
GVDD
Note: L3 cache interface is not supported
in the PC7441, PC7445, or the PC7447
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5. Detailed Specification
This specification describes the specific requirements for the microprocessor PC7457 in compli-
ance with Atmel standard screening.
6. Applicable Documents
1. MIL-STD-883: Test methods and procedures for electronics
2. MIL-PRF-38535: Appendix A: General specifications for microcircuits
The microcircuits are in accordance with the applicable documents and as specified herein.
6.1 Design and Construction
6.1.1 Terminal Connections
Depending on the package, the terminal connections are as shown in Table 11-1, ”Recom-
mended Operating Conditions(1)” on page 12 and Figure 4-1.
Notes: 1. Functional and tested operating conditions are given in ”Recommended Operating Conditions(1)” on page 12. Absolute max-
imum ratings are stress ratings only, and functional operation at the maximums is not guaranteed. Stresses beyond those
listed may affect device reliability or cause permanent damage to the device.
2. Caution: VDD/AVDD must not exceed OVDD/GVDD by more than 1V during normal operation; this limit may be exceeded for a
maximum of 20 ms during power-on reset and power-down sequences.
3. Caution: OVDD/GVDD must not exceed VDD/AVDD by more than 2V during normal operation; this limit may be exceeded for a
maximum of 20 ms during power-on reset and power-down sequences.
4. BVSEL must be set to 0, such that the bus is in 1.8V mode.
5. BVSEL must be set to HRESET or 1, such that the bus is in 2.5V mode.
6. L3VSEL must be set to ¬HRESET (inverse of HRESET), such that the bus is in 1.5V mode.
7. L3VSEL must be set to 0, such that the bus is in 1.8V mode.
8. L3VSEL must be set to HRESET or 1, such that the bus is in 2.5V mode.
9. Caution: VIN must not exceed OVDD or GVDD by more than 0.3V at any time including during power-on reset.
10. VIN may overshoot/undershoot to a voltage and for a maximum duration as shown in Figure 6-1.
6.1.2 Absolute Maximum Ratings(1)
Symbol Characteristic Maximum Value Unit
VDD(2) Core supply voltage -0.3 to 1.60 V
AVDD(2) PLL supply voltage -0.3 to 1.60 V
OVDD(3)(4)
Processor bus supply voltage BVSEL = 0 -0.3 to 1.95 V
OVDD(3)(5) BVSEL = HRESET or OVDD -0.3 to 2.7 V
GVDD(3)(6)
L3 bus supply voltage
L3VSEL = ¬HRESET -0.3 to 1.65 V
GVDD(3)(7) L3VSEL = 0 -0.3 to 1.95 V
GVDD(3)(8) L3VSEL = HRESET or GVDD -0.3 to 2.7 V
VIN(9)(10)
Input voltage
Processor bus -0.3 to OVDD + 0.3 V
VIN(9)(10) L3 bus -0.3 to GVDD + 0.3 V
VIN JTAG signals -0.3 to OVDD + 0.3 V
TSTG Storage temperature range -55 to 150 °C
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Notes: 1. These are the recommended and tested operating conditions. Proper device operation outside of these conditions is not
guaranteed.
2. This voltage is the input to the filter discussed in Section ”PLL Power Supply Filtering” on page 54 and not necessarily the
voltage at the AVDD pin which may be reduced from VDD by the filter.
3. ¬HRESET is the inverse of HRESET.
Figure 6-1. Overshoot/Undershoot Voltage
The PC7457 provides several I/O voltages to support both compatibility with existing systems
and migration to future systems. The PC7457 core voltage must always be provided at nominal
1.3V (see ”Recommended Operating Conditions(1)” on page 12 for actual recommended core
voltage). Voltage to the L3 I/Os and processor interface I/Os are provided through separate sets
of supply pins and may be provided at the voltages shown in Table 6-1. The input voltage
threshold for each bus is selected by sampling the state of the voltage select pins at the nega-
tion of the signal HRESET. The output voltage will swing from GND to the maximum voltage
applied to the OVDD or GVDD power pins.
6.1.3 Recommended Operating Conditions(1)
Symbol Characteristic
Recommended Value
UnitMin Max
VDD Core supply voltage 1.3V ±50 mV or 1.1V ±50 mV V
AVDD(2) PLL supply voltage 1.3V ±50 mV or 1.1V ±50 mV V
OVDD Processor bus supply voltage BVSEL = 0 1.8V ±5% V
OVDD BVSEL = HRESET or OVDD 2.5V ±5% V
GVDD
L3 bus supply voltage
L3VSEL = 0 1.8V ±5% V
GVDD L3VSEL = HRESET or GVDD 2.5V ±5% V
GVDD(3) L3VSEL = ¬HRESET 1.5V ±5% V
VIN
Input voltage
Processor bus GND OVDD V
VIN L3 bus GND GVDD V
VIN JTAG signals GND OVDD V
TjDie-junction temperature -55 125 °C
GND
GND – 0.3V
GND – 0.7V Not to exceed 10% of tSYSCLK
OVDD/GVDD + 20%
OVDD/GVDD + 5%
OVDD/GVDD
VIH
VIL
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Notes: 1. Not implemented on PC7447.
2. Caution: The input threshold selection must agree with the OVDD/GVDD voltages supplied. See
notes in ”Absolute Maximum Ratings(1)” on page 11.
3. If used, pull-down resistors should be less than 250Ω
4. Applicable to L3 bus interface only. ¬HRESET is the inverse of HRESET.
5. 1.8V I/O mode and 1.5V I/O mode are not supported in N spec at VDD = 1.1V.
6.2 Thermal Characteristics
6.2.1 Package Characteristics
Notes: 1. See ”Thermal Management Information” on page 15 for more details about thermal management.
2. Junction temperature is a function of on-chip power dissipation, package thermal resistance, mounting site (board) tempera-
ture, ambient temperature, airflow, power dissipation of other components on the board, and board thermal resistance.
3. Per SEMI G38-87 and JEDEC JESD51-2 with the single-layer board horizontal.
4. Per JEDEC JESD51-6 with the board horizontal.
5. Thermal resistance between the die and the printed-circuit board per JEDEC JESD51-8. Board temperature is measured on
the top surface of the board near the package.
6. Thermal resistance between the die and the case top surface as measured by the cold plate method (MIL SPEC-883
Method 1012.1) with the calculated case temperature. The actual value of RθJC for the part is less than 0.1°C/W.
Table 6-1. Input Threshold Voltage Setting
BVSEL
Signal
Processor Bus Input
Threshold is Relative to:
L3VSEL
Signal(1) L3 Bus Input Threshold is
Relative to: Notes
0 1.8V 0 1.8V (2)(3)(5)
¬HRESET Not available ¬HRESET 1.5V (2)(4)(5)
HRESET 2.5V HRESET 2.5V (2)
1 2.5V 1 2.5V (2)
Table 6-2. Package Thermal Characteristics(1)
Symbol Characteristic
Value
Unit
PC7447
CBGA
PC7457
CBGA
RθJA(2)(3) Junction-to-ambient thermal resistance, natural convection 22 20 °C/W
RθJMA(2)(4) Junction-to-ambient thermal resistance, natural convection, four-layer (2s2p) board 14 14 °C/W
RθJMA(2)(4) Junction-to-ambient thermal resistance, 200 ft./min. airflow, single-layer (1s) board 16 15 °C/W
RθJMA(2)(4) Junction-to-ambient thermal resistance, 200 ft./min. airflow, four-layer (2s2p) board 11 11 °C/W
RθJB(5) Junction-to-board thermal resistance 6 6 °C/W
RθJC(6) Junction-to-case thermal resistance < 0.1 < 0.1 °C/W
Coefficient of thermal expansion 6.8 6.8 ppm/°C
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6.2.2 Package Thermal Characteristics for HCTE
Table 1 provides the package thermal characteristics for the PC7457, HCTE.
Notes: 1. Simulation, no convection air flow.
2. Per JEDEC JESD51-6 with the board horizontal
6.2.3 Internal Package Conduction Resistance
For the exposed-die packaging technology, shown in Table 6-1 on page 13, the intrinsic conduc-
tion thermal resistance paths are as follows:
• The die junction-to-case (actually top-of-die since silicon die is exposed) thermal resistance
• The die junction-to-ball thermal resistance
Figure 17-3 on page 59 depicts the primary heat transfer path for a package with an attached
heat sink mounted to a printed-circuit board.
Figure 6-2. C4 Package with Heat Sink Mounted to a Printed-Circuit Board
Note the internal versus external package resistance.
Heat generated on the active side of the chip is conducted through the silicon, then through the
heat sink attach material (or thermal interface material), and finally to the heat sink where it is
removed by forced-air convection.
Because the silicon thermal resistance is quite small, for a first-order analysis, the temperature
drop in the silicon may be neglected. Thus, the thermal interface material and the heat sink con-
duction/convective thermal resistances are the dominant terms.
Table 1. Package Thermal Characteristics for HCTE Package
Characteristic Symbol
Value
UnitPC755 HCTE
Junction-to-bottom of balls(1) RθJ3.9 °C/W
Junction-to-ambient thermal resistance, natural
convection, four-layer (2s2p) board(1)(2) RθJMA 16.8 °C/W
Junction to board thermal resistance RθJB 7.6 °C/W
External Resistance
External Resistance
Internal Resistance
Radiation Convection
Heat Sink
Thermal Interface Material
Die/Package
Die Junction
Package/Leads
Printed-Circuit Board
Radiation Convection
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6.2.4 Thermal Management Information
This section provides thermal management information for the ceramic ball grid array (CBGA)
package for air-cooled applications. Proper thermal control design is primarily dependent on the
system-level design – the heat sink, airflow, and thermal interface material. To reduce the die-
junction temperature, heat sinks may be attached to the package by several methods – spring
clip to holes in the printed-circuit board or package, and mounting clip and screw assembly (see
Figure 17-2 on page 56); however, due to the potential large mass of the heat sink, attachment
through the printed-circuit board is suggested. If a spring clip is used, the spring force should not
exceed 10 pounds.
Figure 6-3. Package Exploded Cross-sectional View with Several Heat Sink Options
6.2.5 Thermal Interface Materials
A thermal interface material is recommended at the package lid-to-heat sink interface to mini-
mize the thermal contact resistance. For those applications where the heat sink is attached by
spring clip mechanism, Figure 6-3 shows the thermal performance of three thin-sheet thermal-
interface materials (silicone, graphite/oil, floroether oil), a bare joint, and a joint with thermal
grease as a function of contact pressure.
The use of thermal grease significantly reduces the interface thermal resistance. That is, the
bare joint results in a thermal resistance approximately seven times greater than the thermal
grease joint.
Often, heat sinks are attached to the package by means of a spring clip to holes in the printed-
circuit board (see Figure 17-2 on page 56). Therefore, the synthetic grease offers the best ther-
mal performance, considering the low interface pressure and is recommended due to the high
power dissipation of the PC7457. Of course, the selection of any thermal interface material
depends on many factors – thermal performance requirements, manufacturability, service tem-
perature, dielectric properties, cost, etc.
Printed-Circuit Board
Thermal Interface
Material
Heat Sink
Clip
Heat Sink CBGA Package
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Figure 6-4. Thermal Performance of Select Thermal Interface Material
6.2.5.1 Heat Sink Selection Example
For preliminary heat sink sizing, the die-junction temperature can be expressed as follows:
Tj = TI + Tr + (RθJC + Rθint + Rθsa) × Pd
where:
Tj is the die-junction temperature
TI is the inlet cabinet ambient temperature
Tr is the air temperature rise within the computer cabinet
RθJC is the junction-to-case thermal resistance
Rθint is the adhesive or interface material thermal resistance
Rθsa is the heat sink base-to-ambient thermal resistance
Pd is the power dissipated by the device
During operation, the die-junction temperatures (Tj) should be maintained less than the value
specified in ”Recommended Operating Conditions(1)” on page 12. The temperature of air cooling
the component greatly depends on the ambient inlet air temperature and the air temperature rise
within the electronic cabinet. An electronic cabinet inlet-air temperature (Ta) may range from 30°
to 40°C. The air temperature rise within a cabinet (Tr) may be in the range of 5° to 10°C.
The thermal resistance of the thermal interface material (Rθint) is typically about 1.5°C/W. For
example, assuming a Ta of 30°C, a Tr of 5°C, a CBGA package RθJC = 0.1, and a typical power
consumption (Pd) of 18.7W, the following expression for Tj is obtained:
Die-junction temperature: Tj = 30°C + 5°C + (0.1°C/W + 1.5°C/W + θsa) × 18.7W
0
0.5
1
1.5
2
010 20304050607080
Silicone Sheet (0.006 in.)
Bare Joint
Floroether Oil Sheet (0.007 in.)
Graphite/Oil Sheet (0.005 in.)
Synthetic Grease
Contact Pressure (psi)
Specific Thermal Resistance (K-in.2/W)
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For this example, a Rθsa value of 2.1°C/W or less is required to maintain the die junction temper-
ature below the maximum value of ”Recommended Operating Conditions(1)” on page 12.
Though the die junction-to-ambient and the heat sink-to-ambient thermal resistances are a com-
mon figure-of-merit used for comparing the thermal performance of various microelectronic
packaging technologies, one should exercise caution when only using this metric in determining
thermal management because no single parameter can adequately describe three-dimensional
heat flow. The final die-junction operating temperature is not only a function of the component-
level thermal resistance, but the system-level design and its operating conditions. In addition to
the component's power consumption, a number of factors affect the final operating die-junction
temperature – airflow, board population (local heat flux of adjacent components), heat sink effi-
ciency, heat sink attach, heat sink placement, next-level interconnect technology, system air
temperature rise, altitude, etc.
Due to the complexity and the many variations of system-level boundary conditions for today's
microelectronic equipment, the combined effects of the heat transfer mechanisms (radiation,
convection, and conduction) may vary widely. For these reasons, we recommend using conju-
gate heat transfer models for the board, as well as system-level designs.
For system thermal modeling, the PC7447 and PC7457 thermal model is shown in Figure 6-2 on
page 14. Four volumes will be used to represent this device. Two of the volumes, solder ball,
and air and substrate, are modeled using the package outline size of the package. The other
two, die, and bump and underfill, have the same size as the die. The silicon die should be mod-
eled 9.64 × 11 × 0.74 mm with the heat source applied as a uniform source at the bottom of the
volume. The bump and underfill layer is modeled as 9.64 × 11 × 0.69 mm (or as a collapsed vol-
ume) with orthotropic material properties: 0.6W/(m × K) in the xy-plane and 2W/(m × K) in the
direction of the z-axis. The substrate volume is 25 × 25 × 1.2 mm (PC7447) or 29 × 29 × 1.2 mm
(PC7457), and this volume has 18W/(m × K) isotropic conductivity. The solder ball and air layer
is modeled with the same horizontal dimensions as the substrate and is 0.9 mm thick. It can also
be modeled as a collapsed volume using orthotropic material properties: 0.034W/(m × K) in the
xy-plane direction and 3.8W/(m × K) in the direction of the z-axis.
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Figure 6-5. Recommended Thermal Model of PC7447 and PC7457
6.2.6 Power Consumption
Notes: 1. These values apply for all valid processor bus and L3 bus ratios. The values do not include I/O
supply power (OVDD and GVDD) or PLL supply power (AVDD). OVDD and GVDD power is system
dependent, but is typically < 5% of VDD power. Worst case power consumption for AVDD < 3
mW
2. Typical power is an average value measured at the nominal recommended VDD (see ”Rec-
ommended Operating Conditions(1)” on page 12) and 65°C while running the Dhrystone
2.1 benchmark and achieving 2.3 Dhrystone MIPs/MHz.
Bump and Underfill
Die
Substrate
Solder and Air
Die
Substrate
Side View of Model (Not to Scale)
Side View of Model (Not to Scale)
x
y
z
Conductivity Value Unit
Bump and Underfill
kx0.6 W/(m x K)
ky0.6
kz2
Substrate
k18
Solder Ball and Air
kx0.034
ky0.034
kz3.8
Table 6-3. Power Consumption for PC7457
Full-Power Mode
Processor (CPU) Frequency
Unit600 MHz 1000 MHz 1000 MHz 1200 MHz
Core Power Supply 1.1 1.1 1.3 1.3
Typical(1)(2) 5.3 8.3 15.8 17.5 W
Maximum(1)(3) 7.9 11.5 22.0 24.2 W
Nap Mode
Typical(1)(2) 1.31.35.25.2W
Sleep Mode
Typical(1)(2) 1.21.25.15.1W
Deep Sleep Mode (PLL Disabled)
Typical(1)(2) 1.11.15.05.0W
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3. Maximum power is the average measured at nominal VDD and maximum operating junction
temperature (see ”Recommended Operating Conditions(1)” on page 12) while running an
entirely cache-resident, contrived sequence of instructions which keep all the execution units
maximally busy.
4. Doze mode is not a user-definable state; it is an intermediate state between full-power and
either nap or sleep mode. As a result, power consumption for this mode is not tested.
7. Electrical Characteristics
7.1 Static Characteristics
Table 7-1 provides the DC electrical characteristics for the PC7457.
Notes: 1. Nominal voltages; see ”Recommended Operating Conditions(1)” on page 12 for recommended operating conditions.
2. For processor bus signals, the reference is OVDD while GVDD is the reference for the L3 bus signals.
3. Excludes test signals and IEEE 1149.1 boundary scan (JTAG) signals.
4. The leakage is measured for nominal OVDD/GVDD and VDD, or both OVDD/GVDD and VDD must vary in the same direction (for
example, both OVDD and VDD vary by either +5% or -5%).
5. Capacitance is periodically sampled rather than 100% tested.
6. Applicable to L3 bus interface only
Table 7-1. DC Electrical Specifications (see ”Recommended Operating Conditions(1)” on page 12)
Symbol Characteristic
Nominal Bus
Voltage(1) Min Max Unit
VIH(2)
Input high voltage (all inputs including SYSCLK)
1.5 GVDD × 0.65 GVDD + 0.3 V
VIH 1.8 OVDD/GVDD × 0.65 OVDD/GVDD + 0.3 V
VIH 2.5 1.7 OVDD/GVDD + 0.3 V
VIL(2)(6)
Input low voltage (all inputs including SYSCLK)
1.5 -0.3 GVDD × 0.35 V
VIL 1.8 -0.3 OVDD/GVDD × 0.35 V
VIL 2.5 -0.3 0.7 V
IIN(2)(3) Input leakage current, VIN = GVDD/OVDD –– 30µA
ITSI(2)(3)(4) High-impedance (off-state)
Leakage current, VIN = GVDD/OVDD
–– 30µA
VOH(6)
Output high voltage, IOH = -5 mA
1.5 OVDD/GVDD – 0.45 – V
VOH 1.8 OVDD/GVDD – 0.45 – V
VOH 2.5 1.8 – V
VOL(6)
Output low voltage, IOL = 5 mA
1.5 – 0.45 V
VOL 1.8 – 0.45 V
VOL 2.5 – 0.6 V
CIN
Capacitance,
VIN = 0V, f = 1 MHz
L3 interface(5)
––9.5pF
All other inputs(5) –8.0pF
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7.2 Dynamic Characteristics
This section provides the AC electrical characteristics for the PC7457. After fabrication, func-
tional parts are sorted by maximum processor core frequency as shown in section “Clock AC
Specifications” and tested for conformance to the AC specifications for that frequency. The pro-
cessor core frequency is determined by the bus (SYSCLK) frequency and the settings of the
PLL_CFG[0:4] signals. Parts are sold by maximum processor core frequency; See “Ordering
Information” on page 59.
7.2.1 Clock AC Specifications
Table 7-2 provides the clock AC timing specifications as defined in Figure 7-1 and represents
the tested operating frequencies of the devices. The maximum system bus frequency, fSYSCLK,
given in Table 7-2 is considered a practical maximum in a typical single-processor system. The
actual maximum SYSCLK frequency for any application of the PC7457 will be a function of the
AC timings of the PC7457, the AC timings for the system controller, bus loading, printed-circuit
board topology, trace lengths, and so forth, and may be less than the value given in Table 7-2.
Table 7-2. Clock AC Timing Specifications (See ”Recommended Operating Conditions(1)” on page 12)
Symbol Characteristic
Maximum Processor Core Frequency
Unit
600 MHz 867 MHz 1000 MHz
VDD = 1.1V VDD = 1.1V VDD = 1.1V
Min Max Min Max Min Max
fCORE(1) Processor frequency 500 600 500 867 500 1000 MHz
fVCO(1) VCO frequency 1000 1200 1000 1733 1000 2000 MHz
fSYSCLK(1)(2) SYSCLK frequency 33 167 33 167 33 167 MHz
tSYSCLK(2) SYSCLK cycle time 6 30 6 30 6 30 ns
tKR, tKF(3) SYSCLK rise and fall time – 1 – 1 – 1 ns
tKHKL/tSYSCLK(4) SYSCLK duty cycle measured at OVDD/2 40 60 40 60 – – %
SYSCLK jitter(5)(6) –150–150– – ps
Internal PLL relock time(7) –100–100– – µs
Symbol Characteristic
Maximum Processor Core Frequency
Unit
867 MHz 1000 MHz 1200 MHz 1267 MHz
VDD = 1.3V VDD = 1.3V VDD = 1.3V VDD = 1.3V
Min Max Min Max Min Max Min Max
fCORE(1) Processor frequency 600 867 600 1000 600 1200 600 1267 MHz
fVCO(1) VCO frequency 1200 1733 1200 2000 1200 2400 1200 2534 MHz
fSYSCLK(1)(2) SYSCLK frequency 33 167 33 167 33 167 33 167 MHz
tSYSCLK(2) SYSCLK cycle time 6 30 6 30 6 30 6 30 ns
tKR, tKF(3) SYSCLK rise and fall time – 1 – 1–1–1ns
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Notes: 1. Caution: The SYSCLK frequency and PLL_CFG[0:4] settings must be chosen such that the resulting SYSCLK (bus) fre-
quency, CPU (core) frequency and PLL (VCO) frequency don’t exceed their respective maximum or minimum operating
frequencies. Refer to the PLL_CFG[0:4] signal description in ”Core Clocks and PLL Configuration” on page 51 for valid
PLL_CFG[0:4] settings
2. Assumes lightly-loaded, single-processor system.
3. Rise and fall times for the SYSCLK input measured from 0.4V to 1.4V.
4. Timing is guaranteed by design and characterization.
5. This represents total input jitter, short-term and long-term combined, and is guaranteed by design.
6. The SYSCLK driver’s closed loop jitter bandwidth should be less than 1.5 MHz at -3 dB.
7. Relock timing is guaranteed by design and characterization. PLL-relock time is the maximum amount of time required for
PLL lock after a stable VDD and SYSCLK are reached during the power-on reset sequence. This specification also applies
when the PLL has been disabled and subsequently re-enabled during sleep mode. Also note that HRESET must be held
asserted for a minimum of 255 bus clocks after the PLL-relock time during the power-on reset sequence.
Figure 7-1 provides the SYSCLK input timing diagram.
Figure 7-1. SYSCLK Input Timing Diagram
VM = Midpoint Voltage (OVDD/2)
tKHKL/
tSYSCLK(4) SYSCLK duty cycle measured at OVDD/2 40 60 40 60 40 60 40 60 %
SYSCLK jitter(5)(6) –±150–±150–±150–±150ps
Internal PLL relock time(7) – 100 – 100 – 100 – 100 µs
Symbol Characteristic
Maximum Processor Core Frequency
Unit
867 MHz 1000 MHz 1200 MHz 1267 MHz
VDD = 1.3V VDD = 1.3V VDD = 1.3V VDD = 1.3V
Min Max Min Max Min Max Min Max
SYSCLK VMVMVM
tKHKL
tSYSCLK
CVIL
CVIH
tKR tKF
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7.2.2 Processor Bus AC Specifications
Table 7-3 provides the processor bus AC timing specifications for the PC7457 as defined in Fig-
ure 7-10 on page 33 and Figure 7-2 on page 23. Timing specifications for the L3 bus are
provided in section ”L3 Clock AC Specifications” on page 24.
Notes: 1. All input specifications are measured from the midpoint of the signal in question to the midpoint of the rising edge of the input
SYSCLK. All output specifications are measured from the midpoint of the rising edge of SYSCLK to the midpoint of the sig-
nal in question. All output timings assume a purely resistive 50Ω load (see Figure 7-10 on page 33). Input and output timings
are measured at the pin; time-of-flight delays must be added for trace lengths, vias, and connectors in the system.
Table 7-3. Processor Bus AC Timing Specifications(1) (at Recommended Operating Conditions, see page 12.)
Symbol(2) Parameter
All Speed Grades
UnitVDD = 1.1V
Min
VDD = 1.3V Max
tAVKH
tDVKH
tIVKH
tMVKH(8)
Input setup times:
A[0:35], AP[0:4]
D[0:63], DP[0:7]
AACK, ARTRY, BG, CKSTP_IN, DBG, DTI[0:3], GBL,
TT[0:3], QACK, TA, TBEN, TEA, TS,
EXT_QUAL, PMON_IN, SHD[0:1],
BMODE[0:1], BMODE[0:1], BVSEL, L3VSEL
2.0
2.0
2.0
2
1.8
1.8
1.8
1.8
–
–
–
–
ns
tAXKH
tDXKH
tIXKH
tMXKH(8)
Input hold times:
A[0:35], AP[0:4]
D[0:63], DP[0:7]
AACK, ARTRY, BG, CKSTP_IN, DBG, DTI[0:3], GBL,
TT[0:3], QACK, TA, TBEN, TEA, TS, EXT_QUAL,
PMON_IN, SHD[0:1]
BMODE[0:1], BMODE[0:1], BVSEL, L3VSEL
0
0
0
0
0
0
0
0
–
–
–
–
ns
tKHAV
tKHDV
tKHOV
Output valid times:
A[0:35], AP[0:4]
D[0:63], DP[0:7]
AACK, ARTRY, BR, CI, CKSTP_IN, DRDY, DTI[0:3],
GBL, HIT, PMON_OUT, QREQ, TBST, TSIZ[0:2], TT[0:3],
TS, SHD[0:1], WT
–
–
–
–
–
–
2
2
2
ns
tKHAX
tKHDX
tKHOX
Output hold times:
A[0:35], AP[0:4]
D[0:63], DP[0:7]
AACK, ARTRY, BR, CI, CKSTP_IN, DRDY, DTI[0:3],
GBL, HIT, PMON_OUT, QREQ, TBST, TSIZ[0:2], TT[0:3],
TS, SHD[0:1], WT
0.5
0.5
0.5
0.5
0.5
0.5
–
–
–
ns
tKHOE SYSCLK to output enable 0.5 0.5 – ns
tKHOZ SYSCLK to output high impedance (all except TS, ARTRY,
SHD0, SHD1)––3.5ns
tKHTSPZ(3)(4)(5) SYSCLK to TS high impedance after precharge – – 1 tSYSCLK
tKHARP(3)(5)(6)(7) Maximum delay to ARTRY/SHD0/SHD1 precharge – – 1 tSYSCLK
tKHARPZ(3)(5)(6)(7) SYSCLK to ARTRY/SHD0/SHD1 high impedance after
precharge ––2t
SYSCLK
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2. The symbology used for timing specifications herein follows the pattern of t(signal)(state)(reference)(state) for inputs and
t(reference)(state)(signal)(state) for outputs. For example, tIVKH symbolizes the time input signals (I) reach the valid state (V) relative to
the SYSCLK reference (K) going to the high (H) state or input setup time. And tKHOV symbolizes the time from SYSCLK (K)
going high (H) until outputs (O) are valid (V) or output valid time. Input hold time can be read as the time that the input signal
(I) went invalid (X) with respect to the rising clock edge (KH) (note the position of the reference and its state for inputs) and
output hold time can be read as the time from the rising edge (KH) until the output went invalid (OX).
3. tSYSCLK is the period of the external clock (SYSCLK) in ns. The numbers given in the table must be multiplied by the period of
SYSCLK to compute the actual time duration (in ns) of the parameter in question.
4. According to the bus protocol, TS is driven only by the currently active bus master. It is asserted low then precharged high
before returning to high impedance as shown in Figure 7-3 on page 24. The nominal precharge width for TS is 0.5 × tSYSCLK,
that is, less than the minimum tSYSCLK period, to ensure that another master asserting TS on the following clock will not con-
tend with the precharge. Output valid and output hold timing is tested for the signal asserted. Output valid time is tested for
precharge.The high-impedance behavior is guaranteed by design.
5. Guaranteed by design and not tested.
6. According to the bus protocol, ARTRY can be driven by multiple bus masters through the clock period immediately following
AACK. Bus contention is not an issue because any master asserting ARTRY will be driving it low. Any master asserting it low
in the first clock following AACK will then go to high impedance for one clock before precharging it high during the second
cycle after the assertion of AACK. The nominal precharge width for ARTRY is 1.0 tSYSCLK; that is, it should be high imped-
ance as shown in Figure 7-3 on page 24 before the first opportunity for another master to assert ARTRY. Output valid and
output hold timing is tested for the signal asserted.The high-impedance behavior is guaranteed by design.
7. According to the MPX bus protocol, SHD0 and SHD1 can be driven by multiple bus masters beginning the cycle of TS. Tim-
ing is the same as ARTRY
, that is, the signal is high impedance for a fraction of a cycle, then negated for up to an entire
cycle (crossing a bus cycle boundary) before being three-stated again. The nominal precharge width for SHD0 and SHD1 is
1.0 tSYSCLK. The edges of the precharge vary depending on the programmed ratio of core to bus (PLL configurations).
8. BMODE[0:1] and BVSEL are mode select inputs and are sampled before and after HRESET negation. These parameters
represent the input setup and hold times for each sample. These values are guaranteed by design and not tested. These
inputs must remain stable after the second sample. See Figure 7-2 on page 23 for sample timing.
Figure 7-2. Mode Input Timing Diagram
Figure 7-3 provides the input/output timing diagram for the PC7457.
tMVRH tMXRH
HRESET
Mode Signals
VM
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Figure 7-3. Input/Output Timing Diagram
Note: VM = Midpoint Voltage (OVDD/2)
7.2.3 L3 Clock AC Specifications
The L3_CLK frequency is programmed by the L3 configuration register core-to-L3 divisor ratio.
See Table 17-1 on page 51 for example core and L3 frequencies at various divisors. Table 7-4
on page 25 provides the potential range of L3_CLK output AC timing specifications as defined in
Figure 7-4 on page 26.
The maximum L3_CLK frequency is the core frequency divided by two. Given the high core fre-
quencies available in the PC7457, however, most SRAM designs will be not be able to operate
in this mode using current technology and, as a result, will select a greater core-to-L3 divisor to
provide a longer L3_CLK period for read and write access to the L3 SRAMs. Therefore, the typi-
cal L3_CLK frequency shown in Table 7-4 is considered to be the practical maximum in a typical
system. The maximum L3_CLK frequency for any application of the PC7457 will be a function of
the AC timings of the PC7457, the AC timings for the SRAM, bus loading, and printed-circuit
board trace length, and may be greater or less than the value given in Table 7-4. Note that
SYSCLK input jitter and L3_CLK[0:1] output jitter are already comprehended in the L3 bus AC
timing specifications and do not need to be separately accounted for in an L3 AC timing
analysis.
SYSCLK
All Inputs
VM
All Outputs
VM
(Except TS,
All Outputs
TS
VM
tKHOE
ARTRY, SHD0, SHD1)
(Except TS,
ARTRY, SHD0, SHD1)
ARTRY,
SHD0,
SHD1
tAVKH
tKHAV
tIVKH
tAXKH
tIXKH
tKHDV
tKHOV
tKHAX
tKHDX
tKHOX
tKHOZ
tKHTSPZ
tKHTSX
tKHTSV
tKHTSV
tKHARV tKHARP
tKHARX
tKHARPZ
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Clock skews, where applicable, do need to be accounted for in an AC timing analysis.Freescale
is similarly limited by system constraints and cannot perform tests of the L3 interface on a sock-
eted part on a functional tester at the maximum frequencies of Table 7-4. Therefore, functional
operation and AC timing information are tested at core-to-L3 divisors which result in L3 frequen-
cies at 250 MHz or lower.
Notes: 1. The maximum L3 clock frequency (and minimum L3 clock period) will be system dependent. See ”L3 Clock AC Specifica-
tions” on page 24 for an explanation that this maximum frequency is not functionally tested at speed by Freescale. The
minimum L3 clock frequency and period are fSYSCLK and tSYSCLK, respectively.
2. The nominal duty cycle of the L3 output clocks is 50% measured at midpoint voltage.
3. Maximum possible skew between L3_CLK0 and L3_CLK1. This parameter is critical to the address and control signals
which are common to both SRAM chips in the L3.
4. Maximum possible skew between L3_CLK0 and L3_ECHO_CLK1 or between L3_CLK1 and L3_ECHO_CLK3 for PB2 or
Late Write SRAM. This parameter is critical to the read data signals because the processor uses the feedback loop to latch
data driven from the SRAM, each of which drives data based on L3_CLK0 or L3_CLK1.
5. Guaranteed by design and not tested. The input jitter on SYSCLK affects L3 output clocks and the L3 address, data and
control signals equally and, therefore, is already comprehended in the AC timing and does not have to be considered in the
L3 timing analysis. The clock-to-clock jitter shown here is uncertainty in the internal clock period caused by supply voltage
noise or thermal effects. This is also comprehended in the AC timing specifications and need not be considered in the L3
timing analysis.
6. L3 I/O voltage mode must be configured by L3VSEL as described in Table 6-1 on page 13, and voltage supplied at GVDD
must match mode selected as specified in ”Recommended Operating Conditions(1)” on page 12.
Table 7-4. L3_CLK Output AC Timing Specifications at Recommended Operating Conditions (see page 12)(6)
Symbol Parameter
All Speed Grades
UnitMin Typical Max Min Typical Max
fL3_CLK(1) L3 clock frequency – 200 – 250 – MHz
tL3_CLK(1) L3 clock cycle time – 5 – – 4 – ns
tCHCL/tL3_CLK(2) L3 clock duty cycle – 50 – – 50 – %
tL3CSKW1(3) L3 clock output-to-output skew
(L3_CLK0 to L3_CLK1) – – 100 – – 100 ps
tL3CSKW2(4) L3 clock output-to-output skew
(L3_CLK[0:1] to L3_ECHO_CLK[1:3]) – – 100 – – 100 ps
L3 clock jitter(5) – –±75– –±75ps
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Figure 7-4. L3_CLK_OUT Output Timing Diagram
7.2.4 L3 Bus AC Specifications
The PC7457 L3 interface supports three different types of SRAM: source-synchronous, double
data rate (DDR) MSUG2 SRAM, Late Write SRAMs, and pipeline burst (PB2) SRAMs. Each
requires a different protocol on the L3 interface and a different routing of the L3 clock signals.
The type of SRAM is programmed in L3CR[22:23] and the PC7457 then follows the appropriate
protocol for that type. The designer must connect and route the L3 signals appropriately for each
type of SRAM. Following are some observations about the L3 interface.
• The routing for the point-to-point signals (L3_CLK[0:1], L3DATA[0:63], L3DP[0:7], and
L3_ECHO_CLK[0:3]) to a particular SRAM must be delay matched
• For 1M byte of SRAM, use L3_ADDR[16:0] (L3_ADDR[0] is LSB)
• For 2M bytes of SRAM, use L3_ADDR[17:0] (L3_ADDR[0] is LSB)
• No pull-up resistors are required for the L3 interface
• For high speed operations, L3 interface address and control signals should be a "T" with
minimal stubs to the two loads; data and clock signals should be point-to-point to their single
load. Figure 7-5 shows the AC test load for the L3 interface
Figure 7-5. AC Test Load for the L3 Interface
In general, if routing is short, delay-matched, and designed for incident wave reception and min-
imal reflection, there is a high probability that the AC timing of the PC7457 L3 interface will meet
the maximum frequency operation of appropriately chosen SRAMs. This is despite the pessimis-
tic, guard-banded AC specifications (see Table 7-6 on page 28, Table 7-7 on page 29, and
Table 7-8 on page 31), the limitations of functional testers described in Section ”L3 Clock AC
Specifications” on page 24 and the uncertainty of clocks and signals which inevitably make
worst-case critical path timing analysis pessimistic.
L3_CLK0 VM
tL3CR tL3CF
VM
VMVM
L3_CLK1
VM
VM
tL3_CLK
tCHCL
VM
L3_ECHO_CLK1
L3_ECHO_CLK3 VMVM VM VM
VMVM VM VM
For PB2 or Late Write:
tL3CSKW1
tL3CSKW2
tL3CSKW2
Z0 = 50Ω
RL = 50Ω
OVDD/
2
Output
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More specifically, certain signals within groups should be delay-matched with others in the same
group while intergroup routing is less critical. Only the address and control signals are common
to both SRAMs and additional timing margin is available for these signals. The double-clocked
data signals are grouped with individual clocks as shown in Figure 7-6 on page 30 or Figure 7-8
on page 32, depending on the type of SRAM. For example, for the MSUG2 DDR SRAM (see
Figure 7-6); L3DATA[0:31], L3DP[0:3], and L3_CLK[0] form a closely coupled group of outputs
from the PC7457; while L3DATA[0:15], L3DP[0:1], and L3_ECHO_CLK[0] form a closely cou-
pled group of inputs.
The PC7450 RISC Microprocessor Family User’s Manual refers to logical settings called "sam-
ple points" used in the synchronization of reads from the receive FIFO. The computation of the
correct value for this setting is system-dependent and is described in the PC7450 RISC Micro-
processor Family User’s Manual.
Three specifications are used in this calculation and are given in Table 7-5 on page 27. It is
essential that all three specifications are included in the calculations to determine the sample
points as incorrect settings can result in errors and unpredictable behavior. For more informa-
tion, see the PC7450 RISC Microprocessor Family User’s Manual.
Notes: 1. This specification describes a logical offset between the internal clock edge used to launch the
L3 address and control signals (this clock edge is phase-aligned with the processor clock
edge) and the internal clock edge used to launch the L3_CLK[n] signals. With proper board
routing, this offset ensures that the L3_CLK[n] edge will arrive at the SRAM within a valid
address window and provide adequate setup and hold time. This offset is reflected in the L3
bus interface AC timing specifications, but must also be separately accounted for in the calcu-
lation of sample points and, thus, is specified here.
2. This specification is the delay from a rising or falling edge on the internal_L3_CLK signal to the
corresponding rising or falling edge at the L3CLK[n] pins.
3. This specification is the delay from a rising or falling edge of L3_ECHO_CLK[n] to data valid
and ready to be sampled from the FIFO.
7.2.4.1 Effects of L3OHCR Settings on L3 Bus AC Specifications
The AC timing of the L3 interface can be adjusted using the L3 Output Hold Control Register
(L3OCHR).
Each field controls the timing for a group of signals. The AC timing specifications presented
herein represent the AC timing when the register contains the default value of 0x0000_0000.
Incrementing a field delays the associated signals, increasing the output valid time and hold time
of the affected signals. In the special case of delaying an L3_CLK signal, the net effect is to
decrease the output valid and output hold times of all signals being latched relative to that clock
signal. The amount of delay added is summarized in Table 7-6 on page 28.
Note that these settings affect output timing parameters only and don’t impact input timing
parameters of the L3 bus in any way.
Table 7-5. Sample Points Calculation Parameters
Symbol Parameter Max Unit
tAC Delay from processor clock to internal_L3_CLK(1) 3/4 tL3_CLK
tCO Delay from internal_L3_CLK to L3_CLK[n] output pins(2) 3ns
tECI Delay from L3_ECHO_CLK[n] to receive latch(3) 3ns
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Notes: 1. Refer to the PC7450 RISC Microprocessor Family User’s Manual for specific information regarding L3OHCR.
2. See Table 7-7 on page 29 and Table 7-8 on page 31 for more information.
3. Guaranteed by design; not tested or characterized.
4. Default value.
5. Increasing values of L3CLKn_OH delay the L3_CLKn signal, effectively decreasing the output valid and output hold times of
all signals latched relative to that clock signal by the SRAM; see Figure 7-6 on page 30 and Figure 7-8 on page 32.
7.2.4.2 L3 Bus AC Specifications for DDR MSUG2 SRAMs
When using DDR MSUG2 SRAMs at the L3 interface, the parts should be connected as shown
in Figure 7-6. Outputs from the PC7457 are actually launched on the edges of an internal clock
phase-aligned to SYSCLK (adjusted for core and L3 frequency divisors). L3_CLK0 and
L3_CLK1 are this internal clock output with 90° phase delay, so outputs are shown synchronous
to L3_CLK0 and L3_CLK1. Output valid times are typically negative when referenced to
L3_CLKn because the data is launched one-quarter period before L3_CLKn to provide adequate
setup time at the SRAM after the delay-matched address, control, data, and L3_CLKn signals
have propagated across the printed-wiring board.Inputs to the PC7457 are source-synchronous
with the CQ clock generated by the DDR MSUG2 SRAMs. These CQ clocks are received on the
L3_ECHO_CLKn inputs of the PC7457.
Table 7-6. Effect of L3OHCR Settings on L3 Bus AC Timing
Field name(1) Affected Signals Value
Output Valid Time Output Hold Time
Unit Notes
Parameter
Symbol(2) Change(3) Parameter
Symbol(2) Change(3)
L3AOH L3_ADDR[18:0],
L3_CNTL[0:1]
0b00
tL3CHOV
0
tL3CHOX
0
ps
(4)
0b01 +50 +50
0b10 +100 +100
0b11 +150 +150
L3CLKn_OH
All signals latched
by SRAM
connected to
L3_CLKn
0b000
tL3CHOV
tL3CHDV
tL3CLDV
0
tL3CHOX
tL3CHDX
tL3CLDX
0(4)
0b001 -50 -50 (5)
0b010 -100 -100 (5)
0b011 -150 -150 (5)
0b100 -200 -200 (5)
0b101 -250 -250 (5)
0b110 -300 -300 (5)
0b111 -350 -350 (5)
L3DOHn L3_DATA[n:n + 7],
L3_DP[n/8]
0b000
tL3CHDV
tL3CLDV
0
tL3CHDX
tL3CLDX
0(4)
0b001 +50 +50
0b010 +100 +100
0b011 +150 +150
0b100 +200 +200
0b101 +250 +250
0b111 +350 +350
0b111 +350 +350
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An internal circuit delays the incoming L3_ECHO_CLKn signal such that it is positioned within
the valid data window at the internal receiving latches. This delayed clock is used to capture the
data into these latches which comprise the receive FIFO. This clock is asynchronous to all other
processor clocks. This latched data is subsequently read out of the FIFO synchronously to the
processor clock. The time between writing and reading the data is set by the using the sample
point settings defined in the L3CR register.Table 7-7 provides the L3 bus interface AC timing
specifications for the configuration as shown in Figure 9, assuming the timing relationships
shown in Figure 7-7 and the loading shown in Figure 7-5 on page 26.
Notes: 1. Rise and fall times for the L3_CLK output are measured from 20% to 80% of GVDD.
2. For DDR, all input specifications are measured from the midpoint of the signal in question to the midpoint voltage of the ris-
ing or falling edge of the input L3_ECHO_CLKn (see Figure 7-7 on page 30). Input timings are measured at the pins.
3. For DDR, the input data will typically follow the edge of L3_ECHO_CLKn as shown in Figure 7-7. For consistency with other
input setup time specifications, this will be treated as negative input setup time.
4. tL3_CLK/4 is one-fourth the period of L3_CLKn. This parameter indicates that the PC7457 can latch an input signal that is
valid for only a short time before and a short time after the midpoint between the rising and falling (or falling and rising)
edges of L3_ECHO_CLKn at any frequency.
5. All output specifications are measured from the midpoint voltage of the rising (or for DDR write data, also the falling) edge of
L3_CLK to the midpoint of the signal in question. The output timings are measured at the pins. All output timings assume a
purely resistive 50Ω load (see Figure 7-5 on page 26).
6. For DDR, the output data will typically lead the edge of L3_CLKn as shown in Figure 7-7 on page 30. For consistency with
other output valid time specifications, this will be treated as negative output valid time.
7. tL3_CLK/4 is one-fourth the period of L3_CLKn. This parameter indicates that the specified output signal is actually launched
by an internal clock delayed in phase by 90°. Therefore, there is a frequency component to the output valid and output hold
times such that the specified output signal will be valid for approximately one L3_CLK period starting three-fourths of a clock
prior to the edge on which the SRAM will sample it and ending one-fourth of a clock period after the edge it will be sampled.
8. Assumes default value of L3OHCR. See ”Effects of L3OHCR Settings on L3 Bus AC Specifications” on page 27 for more
information.
9. L3 I/O voltage mode must be configured by L3VSEL as described in Table 6-1 on page 13, and voltage supplied at GVDD
must match mode selected as specified in ”Recommended Operating Conditions(1)” on page 12.
Table 7-7. L3 Bus Interface AC Timing Specifications for MSUG2 at Recommended Operating Conditions
(see page 12)
Symbol Parameter
All Speed Grades(9)
UnitMin Min Max Max
tL3CR, tL3CF L3_CLK rise and fall time(1) –0.75–0.75ns
tL3DVEH, tL3DVEL Setup times: Data and parity(2)(3)(4) (-tL3CLK/4)
+ 0.90 –(-tL3CLK/4)
+ 0.70 –ns
tL3DXEH, tL3DXEL Input hold times: Data and parity(2)(4) (tL3CLK/4)
+ 0.85 –(tL3CLK/4)
+ 0.70 –ns
tL3CHDV
, tL3CLDV Valid times: Data and parity(5)(6)(7)(8) –(-tL3CLK/4)
+ 0.60 –(-tL3CLK/4)
+ 0.50 ns
tL3CHOV Valid times: All other outputs(5)(7)(8) –(tL3CLK/4)
+ 0.65 –(tL3CLK/4)
+ 0.65 ns
tL3CHDX, tL3CLDX Output hold times: Data and parity(5)(6)(7)(8) (tL3CLK/4)
- 0.60 –(tL3CLK/4)
- 0.50 –ns
tL3CHOX Output hold times: All other outputs(5)(7)(8) (tL3CLK/4)
- 0.50 –(tL3CLK/4)
- 0.50 –ns
tL3CLDZ L3_CLK to high impedance: Data and parity – (-tL3CLK/4)
+ 0.60 –(-tL3CLK/4)
+ 0.60 ns
tL3CHOZ L3_CLK to high impedance: All other outputs – (tL3CLK/4)
+ 0.65 –(tL3CLK/4)
+ 0.65 ns
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Figure 7-6 shows the typical connection diagram for the PC7457 interfaced to MSUG2 DDR SRAMs.
Figure 7-6. Typical Source Synchronous 4M bytes L3 Cache DDR Interface
Note: 1. Or as recommended by SRAM manufacturer for single-ended clocking.
Figure 7-7 shows the L3 bus timing diagrams for the PC7457 interfaced to MSUG2 SRAMs.
Figure 7-7. L3 Bus Timing Diagrams for L3 Cache DDR SRAMs
Note: tL3CHDV and tL3CLDV as drawn here will be negative numbers, that is, output valid time will be time before the clock edge.
{L3DATA[0:15], L3DP[0:1]}
{L3DATA[16:31], L3DP[2:3]}
{L3DATA[32:47], L3DP[4:5]}
L3ADDR[18:0]
L3_CNTL[0]
L3_CLK[0]
L3_CLK[1]
L3_ECHO_CLK[0]
L3_ECHO_CLK[1]
L3ECHO_CLK[2]
L3_ECHO_CLK[3]
{L3DATA[48:63], L3DP[6:7]}
CQ
SA[18:0]
CK
B1
B2
SRAM 0
SRAM 1
CQ
D[0:17]
D[18:35]
CQ
SA[18:0]
CK
B1
B2
CQ
D[0:17]
D[18:35]
L3_CNTL[1]
NC
NC
GND
GND
GND
NC
NC
GND
GND
GND
PC7457
Denotes
Receive (SRAM
to PC7457)
Aligned Signals
Denotes
Transmit
(PC7457 to SRAM)
Aligned Signals
(1)
CQ
CK
B3
G
CQ
LBO
CQ
CK
B3
G
CQ
LBO
GVDD/2
(1)
GVDD/2
L3_CLK[0,1]
ADDR, L3CNTL
VM
tL3CHOV
tL3CHOX
VM
tL3CHOZ
VM VM VM
tL3CHDV
tL3CHDX
Outputs
tL3CLDV
tL3CLDX
tL3CLDZ
L3DATA WRITE
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Notes: 1. tL3DVEH and tL3DVEL as drawn here will be negative numbers, that is, input setup time will be time after the clock edge.
2. VM = Midpoint Voltage (GVDD/2)
7.2.5 L3 Bus AC Specifications for PB2 and Late Write SRAMs
When using PB2 or Late Write SRAMs at the L3 interface, the parts should be connected as
shown in Figure 7-8 on page 32. These SRAMs are synchronous to the PC7457; one L3_CLKn
signal is output to each SRAM to latch address, control, and write data. Read data is launched
by the SRAM synchronous to the delayed L3_CLKn signal it received. The PC7457 needs a
copy of that delayed clock which launched the SRAM read data to know when the returning data
will be valid. Therefore, L3_ECHO_CLK1 and L3_ECHO_CLK3 must be routed halfway to the
SRAMs and returned to the PC7457 inputs L3_ECHO_CLK0 and L3_ECHO_CLK2, respec-
tively. Thus, L3_ECHO_CLK0 and L3_ECHO_CLK2 are phase-aligned with the input clock
received at the SRAMs. The PC7457 will latch the incoming data on the rising edge of
L3_ECHO_CLK0 and L3_ECHO_CLK2.Table 7-8 provides the L3 bus interface AC timing spec-
ifications for the configuration shown in Figure 7-8, assuming the timing relationships of Figure
7-9 and the loading of Figure 7-5 on page 26.
Notes: 1. Rise and fall times for the L3_CLK output are measured from 20% to 80% of GVDD.
2. Timing behavior and characterization are currently being evaluated.
3. All input specifications are measured from the midpoint of the signal in question to the midpoint voltage of the rising edge of
the input L3_ECHO_CLKn (see Figure 7-7 on page 30). Input timings are measured at the pins.
4. All output specifications are measured from the midpoint voltage of the rising edge of L3_CLKn to the midpoint of the signal
in question. The output timings are measured at the pins. All output timings assume a purely resistive 50Ω load (see Figure
7-7).
L3_ECHO_CLK[0,1,2,3]
L3 Data and Data
Parity Inputs
VM VM VM VMVM
Inputs
tL3DVEH
tL3DXEL
tL3DVEL
tL3DXEH
Table 7-8. L3 Bus Interface AC Timing Specifications for PB2 and Late Write SRAMs at Recommended Operating
Conditions (see page 12)
Symbol Parameter
All Speed Grades
UnitMin Max
tL3CR, tL3CF L3_CLK rise and fall time(1)(2) –0.75ns
tL3DVEH Setup times: Data and parity(2)(3) 0.1 – ns
tL3DXEH Input hold times: Data and parity(2)(3) –0.7ns
tL3CHDV Valid times: Data and parity(2)(4)(5) –2.5ns
tL3CHOV Valid times: All other outputs(5) –1.8ns
tL3CHDX Output hold times: Data and parity(2)(4)(5) 1.4 – ns
tL3CHOX Output hold times: All other outputs(2)(5) 1.0 – ns
tL3CHDZ L3_CLK to high impedance: Data and parity(2) –3.0ns
tL3CHOZ L3_CLK to high impedance: All other outputs(2) –3.0ns
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5. Assumes default value of L3OHCR. See ”Effects of L3OHCR Settings on L3 Bus AC Specifications” on page 27” for more
information.
Figure 7-8 shows the typical connection diagram for the PC7457 interfaced to PB2 SRAMs or Late Write SRAMs.
Figure 7-8. Typical Synchronous 1M Byte L3 Cache Late Write or PB2 Interface
Note: 1. Or as recommended by SRAM manufacturer for single-ended clocking.
L3_ADDR[16:0]
L3_CNTL[0] SA[16:0]
K
K
SS
SW
ZZ
G
SRAM 0
DQ[0:17]
DQ[18:36 ]
L3_CNTL[1]
GVDD/2/2 (1)
GVDD/2 (1)
GND
GND
SRAM 1
GND
GND
L3_CLK[0]
L3_CLK[1]
L3_ECHO_CLK[0]
L3_ECHO_CLK[1]
L3_ECHO_CLK[2]
PC7457
L3_ECHO_CLK[3]
SA[16:0]
K
K
SS
SW
ZZ
G
DQ[0:17]
DQ[18:36]
Denotes
Receive (SRAM
to PC7457)
Aligned Signals
Denotes
Transmit
(PC7457 to SRAM)
Aligned Signals
{L3_DATA[0:15], L3_DP[0:1]}
{L3_DATA[16:31], L3_DP[2:3]}
{L3_DATA[32:47], L3_DP[4:5]}
{L3_DATA[48:63], L3_DP[6:7]}
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Figure 7-9 shows the L3 bus timing diagrams for the PC7457 interfaced to PB2 or Late Write SRAMs.
Figure 7-9. L3 Bus Timing Diagrams for Late Write or PB2 SRAMs
Note: VM = Midpoint Voltage (GVDD/2)
Figure 7-10. AC Test Load
7.2.6 IEEE 1149.1 AC Timing Specifications
Table 7-9 provides the IEEE 1149.1 (JTAG) AC timing specifications as defined in Figure 7-12
through Figure 7-15 on page 35.
L3_ECHO_CLK[0,2] VM
tL3DVEH
tL3DXEH
L3_CLK[0,1]
ADDR, L3_CNTL
VM
tL3CHOV tL3CHOX
VM
tL3CHDZ
Outputs
Inputs
L3_ECHO_CLK[1,3]
tL3CHDV tL3CHDX
tL3CHOZ
L3DATA WRITE
Parity Inputs
L3 Data and Data
Z0 = 50Ω
RL = 50Ω
OVDD/
2
Output
Table 7-9. JTAG AC Timing Specifications (Independent of SYSCLK)()at Recommended Operating Conditions
(see ”Recommended Operating Conditions(1)” on page 12)
Symbol Parameter Min Max Unit
fTCLK TCK frequency of operation 0 33.3 MHz
tTCLK TCK cycle time 30 – ns
tJHJL TCK clock pulse width measured at 1.4V 15 – ns
tJR and tJF TCK rise and fall times 0 2 ns
tTRST(2) TRST assert time 25 – ns
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Notes: 1. All outputs are measured from the midpoint voltage of the falling/rising edge of TCLK to the midpoint of the signal in ques-
tion. The output timings are measured at the pins. All output timings assume a purely resistive 50Ω load (see Figure 7-11).
Time-of-flight delays must be added for trace lengths, vias and connectors in the system.
2. TRST is an asynchronous level sensitive signal. The setup time is for test purposes only.
3. Non-JTAG signal input timing with respect to TCK.
4. Non-JTAG signal output timing with respect to TCK.
5. Guaranteed by design and characterization
Figure 7-11 provides the AC test load for TDO and the boundary-scan outputs of the PC7457.
Figure 7-11. Alternate AC Test Load for the JTAG Interface
Figure 7-12. JTAG Clock Input Timing Diagram
Note: VM = Midpoint Voltage (OVDD/2)
tDVJH(3)
tIVJH
Input Setup Times:
Boundary-scan data
TMS, TDI
4
0
–
–
ns
tDXJH(3)
tIXJH
Input Hold Times:
Boundary-scan data
TMS, TDI
20
25
–
–
ns
tJLDV(4)
tJLOV
Valid Times:
Boundary-scan data
TDO
4
4
20
25
ns
tJLDX(4)
tJLOX
Output hold times:
Boundary-scan data
TDO
TBD
TBD
TBD
TBD
tJLDZ(4)(5)
tJLOZ
TCK to output high impedance:
Boundary-scan data
TDO
3
3
19
9
ns
Table 7-9. JTAG AC Timing Specifications (Independent of SYSCLK)()at Recommended Operating Conditions
(see ”Recommended Operating Conditions(1)” on page 12) (Continued)
Symbol Parameter Min Max Unit
Output Z0 = 50Ω
RL = 50Ω
OVDD/2
VMVMVM
tTCLK
tJR tJF
tJHJL
TCLK
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Figure 7-13. TRST Timing Diagram
Note: VM = Midpoint Voltage (OVDD/2)
Figure 7-14. Boundary-scan Timing Diagram
Note: VM = Midpoint Voltage (OVDD/2)
Figure 7-15. Test Access Port Timing Diagram
Note: VM = Midpoint Voltage (OVDD/2)
TRST
t
TRST
VM
VM
VMTCK
Boundary
Data Inputs
Boundary
Data Outputs
Boundary
Data Outputs
tDXJH
tDVJH
tJLDV
tJLDZ
Output Data Valid
tJLDX
VM
Input
Data Valid
Output Data Valid
tJLOX
Input Data
Valid
tIVJH tIXJH
tJLOV
tJLOZ
Output Data Valid
Output Data Valid
VM
TCK
TDI, TMS
TDO
TDO
VM
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8. Preparation for Delivery
8.1 Handling
MOS devices must be handled with certain precautions to avoid damage due to accumulation of
static charge. Input protection devices have been designed in the chip to minimize the effect of
static buildup. However, the following handling practices are recommended:
• Devices should be handled on benches with conductive and grounded surfaces
• Ground test equipment, tools and operator
• Do not handle devices by the leads
• Store devices in conductive foam or carriers
• Avoid use of plastic, rubber or silk in MOS areas
• Maintain relative humidity above 50% if practical
9. Package Mechanical Data
The following sections provide the package parameters and mechanical dimensions for the
CBGA package.
9.1 Package Parameters for the PC7447, 360 CBGA
The package parameters are as provided in the following list. The package type is 25 × 25 mm,
360-lead ceramic ball grid array (CBGA).
Package outline 25 mm × 25 mm
Interconnects 360 (19 × 19 ball array - 1)
Pitch 1.27 mm (50 mil)
Minimum module height 2.72 mm
Maximum module height 3.24 mm
Ball diameter 0.89 mm (35 mil)
Coefficient of thermal expansion 6.8 ppm/°C (CBGA)
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10. Pin Assignment
Figure 10-1 shows the pinout of the PC7447, 360 CBGA package as viewed from the top
surface.
Figure 10-2 shows the side profile of the CBGA package to indicate the direction of the top sur-
face view.
Figure 10-1. Pinout of the PC7447, 360 CBGA Package as Viewed from the Top Surface
Figure 10-2. Side View of the CBGA Package
A
B
C
D
E
F
G
H
J
K
L
M
N
P
R
T
321456 16 17 18 19
U
V
W
151413121110987
Substrate Assembly
Encapsulant
View Die
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11. Pinout Listings
Table 11-1 provides the pinout listing for the PC7447, 360 CBGA package. Table 7-9 provides
the pinout listing for the PC7457, 483 CBGA package.
Note: This pinout is not compatible with the PC750, PC7400, or PC7410 360 BGA package.
Table 11-1. Pinout Listing for the PC7447, 360 CBGA Package
Signal Name Pin Number Active I/O I/F Select(1)
A[0:35](2) E11, H1, C11, G3, F10, L2, D11, D1, C10, G2, D12, L3, G4, T2, F4,
V1, J4, R2, K5, W2, J2, K4, N4, J3, M5, P5, N3, T1, V2, U1, N5, W1,
B12, C4, G10, B11
High I/O BVSEL
AACK R1 Low Input BVSEL
AP[0:4] C1, E3, H6, F5, G7 High I/O BVSEL
ARTRY(3) N2 Low I/O BVSEL
AVDD A8 – Input BVSEL
BG M1 Low Input BVSEL
BMODE0(4) G9 Low Input BVSEL
BMODE1(5) F8 Low Input BVSEL
BR D2 Low Output BVSEL
BVSEL(1)(6) B7 High Input BVSEL
CI(3) J1 Low Output BVSEL
CKSTP_IN A3 Low Input BVSEL
CKSTP_OUT B1 Low Output BVSEL
CLK_OUT H2 High Output BVSEL
D[0:63]
R15, W15, T14, V16, W16, T15, U15, P14, V13, W13, T13, P13, U14,
W14, R12, T12, W12, V12, N11, N10, R11, U11, W11, T11, R10, N9,
P10, U10, R9, W10, U9, V9, W5, U6, T5, U5, W7, R6, P7, V6, P17,
R19, V18, R18, V19, T19, U19, W19, U18, W17, W18, T16, T18, T17,
W3, V17, U4, U8, U7, R7, P6, R8, W8, T8
High I/O BVSEL
DBG M2 Low Input BVSEL
DP[0:7] T3, W4, T4, W9, M6, V3, N8, W6 High I/O BVSEL
DRDY(7) R3 Low Output BVSEL
DTI[0:3](8) G1, K1, P1, N1 High Input BVSEL
EXT_QUAL(9) A11 High Input BVSEL
GBL E2 Low I/O BVSEL
GND
B5, C3, D6, D13, E17, F3, G17, H4, H7, H9, H11, H13, J6, J8, J10,
J12, K7, K3, K9, K11, K13, L6, L8, L10, L12, M4, M7, M9, M11, M13,
N7, P3, P9, P12, R5, R14, R17, T7, T10, U3, U13, U17, V5, V8, V11,
V15
––N/A
HIT(7) B2 Low Output BVSEL
HRESET D8 Low Input BVSEL
INT D4 Low Input BVSEL
L1_TSTCLK(9) G8 High Input BVSEL
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5345C–HIREL–07/05
PC7447/57 [Preliminary]
L2_TSTCLK(10) B3 High Input BVSEL
No Connect(11)
A6, A13, A14, A15, A16, A17, A18, A19, B13, B14, B15, B16, B17,
B18, B19, C13, C14, C15, C16, C17, C18, C19, D14, D15, D16, D17,
D18, D19, E12, E13, E14, E15, E16, E19, F12, F13, F14, F15, F16,
F17, F18, F19, G11, G12, G13, G14, G15, G16, G19, H14, H15, H16,
H17, H18, H19, J14, J15, J16, J17, J18, J19, K15, K16, K17, K18,
K19, L14, L15, L16, L17, L18, L19, M14, M15, M16, M17, M18, M19,
N12, N13, N14, N15, N16, N17, N18, N19, P15, P16, P18, P19
–– –
LSSD_MODE(6)(12) E8 Low Input BVSEL
MCP C9 Low Input BVSEL
OVDD B4, C2, C12, D5, E18, F2, G18, H3, J5, K2, L5, M3, N6, P2, P8, P11,
R4, R13, R16, T6, T9, U2, U12, U16, V4, V7, V10, V14 ––N/A
PLL_CFG[0:4] B8, C8, C7, D7, A7 High Input BVSEL
PMON_IN(13) D9 Low Input BVSEL
PMON_OUT A9 Low Output BVSEL
QACK G5 Low Input BVSEL
QREQ P4 Low Output BVSEL
SHD[0:1](3) E4, H5 Low I/O BVSEL
SMI F9 Low Input BVSEL
SRESET A2 Low Input BVSEL
SYSCLK A10 – Input BVSEL
TA K6 Low Input BVSEL
TBEN E1 High Input BVSEL
TBST F11 Low Output BVSEL
TCK C6 High Input BVSEL
TDI(6) B9 High Input BVSEL
TDO A4 High Output BVSEL
TEA L1 Low Input BVSEL
TEST[0:3](12) A12, B6, B10, E10 – Input BVSEL
TEST[4](9) D10 – Input BVSEL
TMS(6) F1 High Input BVSEL
TRST(6)(14) A5 Low Input BVSEL
TS(3) L4 Low I/O BVSEL
TSIZ[0:2] G6, F7, E7 High Output BVSEL
TT[0:4] E5, E6, F6, E9, C5 High I/O BVSEL
WT(3) D3 Low Output BVSEL
VDD H8, H10, H12, J7, J9, J11, J13, K8, K10, K12, K14, L7, L9, L11, L13,
M8, M10, M12 ––N/A
Table 11-1. Pinout Listing for the PC7447, 360 CBGA Package (Continued)
Signal Name Pin Number Active I/O I/F Select(1)
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5345C–HIREL–07/05
PC7447/57 [Preliminary]
Notes: 1. OVDD supplies power to the processor bus, JTAG, and all control signals; and VDD supplies power to the processor core and
the PLL (after filtering to become AVDD). To program the I/O voltage, connect BVSEL to either GND (selects 1.8V) or to
HRESET (selects 2.5V). If used, the pull-down resistor should be less than 250Ω. For actual recommended value of VIN or
supply voltages see Figure 6.1.3 on page 12.
2. Unused address pins must be pulled down to GND.
3. These pins require weak pull-up resistors (for example, 4.7 kΩ) to maintain the control signals in the negated state after they
have been actively negated and released by the PC7447 and other bus masters.
4. This signal selects between MPX bus mode (asserted) and 60x bus mode (negated) and will be sampled at HRESET going
high.
5. This signal must be negated during reset, by pull up to OVDD or negation by ¬HRESET (inverse of HRESET), to ensure
proper operation.
6. Internal pull up on die.
7. Ignored in 60x bus mode.
8. These signals must be pulled down to GND if unused, or if the PC7447 is in 60x bus mode.
9. These input signals are for factory use only and must be pulled down to GND for normal machine operation.
10. It is recommended this test signal be tied to HRESET; however, other configurations will not adversely affect performance.
11. These signals are for factory use only and must be left unconnected for normal machine operation.
12. These input signals are for factory use only and must be pulled up to OVDD for normal machine operation.
13. This pin can externally cause a performance monitor event. Counting of the event is enabled via software.
14. This signal must be asserted during reset, by pull down to GND or assertion by HRESET, to ensure proper operation
41
5345C–HIREL–07/05
PC7447/57 [Preliminary]
12. Mechanical Dimensions for the PC7447, 360 CBGA
Figure 12-1 provides the mechanical dimensions and bottom surface nomenclature for the PC7447, 360 CBGA package.
Figure 12-1. Mechanical Dimensions and Bottom Surface Nomenclature for the PC7447, 360 CBGA Package
Notes: 1. Dimensioning and tolerance per ASME Y14.5M, 1994
2. Dimensions in millimeters
3. Top side A1 corner index is a metallized feature with various shapes. Bottom side A1 corner is designated with a ball missing
from the array
CA
360X
A
B
C
D
E
F
G
H
J
K
L
M
N
P
R
T
B0.3
C
0.15
b
U
W
V
12345678910111213141516171819
0.2
2X
C
A1 CORNER
B
0.2
2X
D
E
E3
E2
E1
E4
D2
D4
D3 D1
Capacitor Region
1
A
0.15 A
0.35 A
A
A1
A2
A3
Millimeters
DIM MIN MAX
A 2.72 3.20
A1 0.80 1
A2 1.10 1.30
A3 – 0.6
b 0.82 0.93
D 25 BSC
D1 – 11.3
D2 8 –
D3 – 6.5
D4 10.9 11.1
e 1.27 BSC
E 25 BSC
E1 – 11.3
E2 8 –
E3 – 6.5
E4 9.55 9.75
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5345C–HIREL–07/05
PC7447/57 [Preliminary]
12.1 Package Parameters for the PC7457, 483 CBGA and 483 HCTE
The package parameters are as provided in the following list. The package type is 29 ×29 mm,
483-lead ceramic ball grid array (CBGA and HCTE).
Package outline 29 mm × 29 mm
Interconnects 483 (22 × 22 ball array - 1)
Pitch 1.27 mm (50 mil)
Minimum module height –
Maximum module height 3.22 mm
Ball diameter 0.89 mm (35 mil)
Coefficient of thermal expansion 6.8 ppm/°C (CBGA)
12.3 ppm/°C (HCTE - CBGA)
Figure 12-2 shows the pinout of the PC7457, 483 CBGA and HCTE packages as viewed from
the top surface.
Figure 12-3 shows the side profile of the CBGA and HCTE packages to indicate the direction of
the top surface view.
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5345C–HIREL–07/05
PC7447/57 [Preliminary]
Figure 12-2. Pinout of the PC7457, 483 CBGA and HCTE Package as Viewed from the Top
Surface
Figure 12-3. Side View of the CBGA and HCTE Packages
A
B
C
D
E
F
G
H
J
K
L
M
N
P
R
T
123456789101112131415
16 17 18 19
U
V
W
20 21 22
Y
AA
AB
Encapsulant
Substrate Assembly View
Die
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5345C–HIREL–07/05
PC7447/57 [Preliminary]
Table 12-1. Pinout Listing for the PC7457, 483 CBGA and HCTE Packages
Signal Name Pin Number Active I/O I/F Select(1)
A[0:35](2) E10, N4, E8, N5, C8, R2, A7, M2, A6, M1, A10, U2, N2, P8, M8, W4,
N6, U6, R5, Y4, P1, P4, R6, M7, N7, AA3, U4, W2, W1, W3, V4,
AA1, D10, J4, G10, D9
High I/O BVSEL
AACK U1 Low Input BVSEL
AP[0:4] L5, L6, J1, H2, G5 High I/O BVSEL
ARTRY(3) T2 Low I/O BVSEL
AVDD B2 – Input N/A
BG R3 Low Input BVSEL
BMODE0(4) C6 Low Input BVSEL
BMODE1(5) C4 Low Input BVSEL
BR K1 Low Output BVSEL
BVSEL(6)(7) G6 High Input N/A
CI(3) R1 Low Output BVSEL
CKSTP_IN F3 Low Input BVSEL
CKSTP_OUT K6 Low Output BVSEL
CLK_OUT N1 High Output BVSEL
D[0:63]
AB15, T14, R14, AB13, V14, U14, AB14, W16, AA11, Y11, U12,
W13, Y14, U13, T12, W12, AB12, R12, AA13, AB11, Y12, V11, T11,
R11, W10, T10, W11, V10, R10, U10, AA10, U9, V7, T8, AB4, Y6,
AB7, AA6, Y8, AA7, W8, AB10, AA16, AB16, AB17, Y18, AB18,
Y16, AA18, W14, R13, W15, AA14, V16, W6, AA12, V6, AB9, AB6,
R7, R9, AA9, AB8, W9
High I/O BVSEL
DBG V1 Low Input BVSEL
DP[0:7] AA2, AB3, AB2, AA8, R8, W5, U8, AB5 High I/O BVSEL
DRDY(8) T6 Low Output BVSEL
DTI[0:3])(9) P2, T5, U3, P6 High Input BVSEL
EXT_QUAL(10) B9 High Input BVSEL
GBL M4 Low I/O BVSEL
GND
A22, B1, B5, B12, B14, B16, B18, B20, C3, C9, C21, D7, D13, D15,
D17, D19, E2, E5, E21, F10, F12, F14, F16, F19, G4, G7, G17, G21,
H13, H15, H19, H5, J3, J10, J12, J14, J17, J21, K5, K9, K11, K13,
K15, K19, L10, L12, L14, L17, L21, M3, M6, M9, M11, M13, M19,
N10, N12, N14, N17, N21, P3, P9, P11, P13, P15, P19, R17, R21,
T13, T15, T19, T4, T7, T9, U17, U21, V2, V5, V8, V12, V15, V19,
W7, W17, W21, Y3, Y9, Y13, Y15, Y20, AA5, AA17, AB1, AB22
–– N/A
GVDD(11) B13, B15, B17, B19, B21, D12, D14, D16, D18, D21, E19, F13, F15,
F17, F21, G19, H12, H14, H17, H21, J19, K17, K21, L19, M17, M21,
N19, P17, P21, R15, R19, T17, T21, U19, V17, V21, W19, Y21
–– N/A
HIT(8) K2 Low Output BVSEL
HRESET A3 Low Input BVSEL
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5345C–HIREL–07/05
PC7447/57 [Preliminary]
INT J6 Low Input BVSEL
L1_TSTCLK(10) H4 High Input BVSEL
L2_TSTCLK(12) J2 High Input BVSEL
L3VSEL(6)(7) A4 High Input N/A
L3ADDR[18:0] H11, F20, J16, E22, H18, G20, F22, G22, H20, K16, J18, H22, J20,
J22, K18, K20, L16, K22, L18 High Output L3VSEL
L3_CLK[0:1] V22, C17 High Output L3VSEL
L3_CNTL[0:1] L20, L22 Low Output L3VSEL
L3DATA[0:63]
AA19, AB20, U16, W18, AA20, AB21, AA21, T16, W20, U18, Y22,
R16, V20, W22, T18, U20, N18, N20, N16, N22, M16, M18, M20,
M22, R18, T20, U22, T22, R20, P18, R22, M15, G18, D22, E20,
H16, C22, F18, D20, B22, G16, A21, G15, E17, A20, C19, C18, A19,
A18, G14, E15, C16, A17, A16, C15, G13, C14, A14, E13, C13,
G12, A13, E12, C12
High I/O L3VSEL
L3DP[0:7] AB19, AA22, P22, P16, C20, E16, A15, A12 High I/O L3VSEL
L3_ECHO_CLK[0,2] V18, E18 High Input L3VSEL
L3_ECHO_CLK[1,3] P20, E14 High I/O L3VSEL
LSSD_MODE(7)(13) F6 Low Input BVSEL
MCP B8 Low Input BVSEL
No Connect(14) A8, A11, B6, B11, C11, D11, D3, D5, E11, E7, F2, F11, G2, H9 – – N/A
OVDD
B3, C5, C7, C10, D2, E3, E9, F5, G3, G9, H7, J5, K3, L7, M5, N3,
P7, R4, T3, U5, U7, U11, U15, V3, V9, V13, Y2, Y5, Y7, Y10, Y17,
Y19, AA4, AA15
–– N/A
PLL_CFG[0:4] A2, F7, C2, D4, H8 High Input BVSEL
PMON_IN(15) E6 Low Input BVSEL
PMON_OUT B4 Low Output BVSEL
QACK K7 Low Input BVSEL
QREQ Y1 Low Output BVSEL
SHD[0:1] L4, L8 Low I/O BVSEL
SMI G8 Low Input BVSEL
SRESET G1 Low Input BVSEL
SYSCLK D6 – Input BVSEL
TA N8 Low Input BVSEL
TBEN L3 High Input BVSEL
TBST B7 Low Output BVSEL
TCK J7 High Input BVSEL
TDI(7) E4 High Input BVSEL
TDO H1 High Output BVSEL
TEA T1 Low Input BVSEL
Table 12-1. Pinout Listing for the PC7457, 483 CBGA and HCTE Packages (Continued)
Signal Name Pin Number Active I/O I/F Select(1)
46
5345C–HIREL–07/05
PC7447/57 [Preliminary]
.
Notes: 1. OVDD supplies power to the processor bus, JTAG, and all control signals except the L3 cache controls (L3CTL[0:1]); GVDD
supplies power to the L3 cache interface (L3ADDR[0:17], L3DATA[0:63], L3DP[0:7], L3_ECHO_CLK[0:3], and L3_CLK[0:1])
and the L3 control signals L3_CNTL[0:1]; and VDD supplies power to the processor core and the PLL (after filtering to
become AVDD). For actual recommended value of VIN or supply voltages, see ”Recommended Operating Conditions(1)” on
page 12.
2. Unused address pins must be pulled down to GND.
3. These pins require weak pull-up resistors (for example, 4.7 kΩ) to maintain the control signals in the negated state after they
have been actively negated and released by the PC7457 and other bus masters.
4. This signal selects between MPX bus mode (asserted) and 60x bus mode (negated) and will be sampled at HRESET going
high.
5. This signal must be negated during reset, by pull up to OVDD or negation by ¬HRESET (inverse of HRESET), to ensure
proper operation.
6. See Table 6-1 for bus voltage configuration information. If used, pull-down resistors should be less than 250Ω.
7. Internal pull up on die.
8. Ignored in 60x bus mode.
9. These signals must be pulled down to GND if unused or if the PC7457 is in 60x bus mode.
10. These input signals for factory use only and must be pulled down to GND for normal machine operation.
11. Power must be supplied to GVDD, even when the L3 interface is disabled or unused.
12. It is recommended that this test signal be tied to HRESET; however, other configurations will not adversely affect
performance.
13. These input signals are for factory use only and must be pulled up to OVDD for normal machine operation.
14. These signals are for factory use only and must be left unconnected for normal machine operation.
15. This pin can externally cause a performance monitor event. Counting of the event is enabled via software.
16. This signal must be asserted during reset, by pull down to GND or assertion by HRESET, to ensure proper operation.
17. These pins are internally connected to VDD. They are intended to allow an external device to detect the core voltage level
present at the processor core. If unused, they must be connected directly to VDD or left unconnected.
TEST[0:5](13) B10, H6, H10, D8, F9, F8 – Input BVSEL
TEST[6](10) A9 – Input BVSEL
TMS(7) K4 High Input BVSEL
TRST(7)(16) C1 Low Input BVSEL
TS(3) P5 Low I/O BVSEL
TSIZ[0:2] L1,H3,D1 High Output BVSEL
TT[0:4] F1, F4, K8, A5, E1 High I/O BVSEL
WT(3) L2 Low Output BVSEL
VDD J9, J11, J13, J15, K10, K12, K14, L9, L11, L13, L15, M10, M12,
M14, N9, N11, N13, N15, P10, P12, P14 –– N/A
VDD_SENSE[0:1](17) G11, J8 – – N/A
Table 12-1. Pinout Listing for the PC7457, 483 CBGA and HCTE Packages (Continued)
Signal Name Pin Number Active I/O I/F Select(1)
47
5345C–HIREL–07/05
PC7447/57 [Preliminary]
13. Mechanical Dimensions for the PC7457, 483 CBGA
Figure 12-1 provides the mechanical dimensions and bottom surface nomenclature for the PC7457, 483 CBGA package.
Figure 13-1. Mechanical Dimensions and Bottom Surface Nomenclature for the PC7457, 483 CBGA Package
Notes: 1. Dimensioning and tolerancing per ASME Y14.5M, 1994
2. Dimensions in millimeters
3. Top side A1 corner index is a metallized feature with various shapes. Bottom side. A1 corner is designated with a ball miss-
ing from the array
CA
483X
A
B
C
D
E
F
G
H
J
K
L
M
N
P
R
T
B0.3
C
0.15
b
U
W
V
Y
AB
AA
123456 78910111213141516171819202122
Capacitor Region
A
0.15 A
0.35 A
A
A1
A2
A3
Millimeters
DIM MIN MAX
A 2.72 3.20
A1 0.80 1
A2 1.10 1.30
A3 – 0.6
b 0.82 0.93
D 29 BSC
D1 – 12.5
D2 8.5 –
D3 – 8.4
D4 10.9 11.1
e 1.27 BSC
E 29 BSC
E1 – 12.5
E2 8.5 –
E3 – 8.4
E4 9.55 9.75
0.2
2X
C
A1 CORNER
B
0.2
2X
D
E
E3
E2
E1
E4
D2
D4
D3 D1
1
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5345C–HIREL–07/05
PC7447/57 [Preliminary]
14. Substrate Capacitors for the PC7457, 483 CBGA
Figure 14-1 shows the connectivity of the substrate capacitor pads for the PC7457, 483 CBGA. All capacitors are 100 nF.
Figure 14-1. Substrate Bypass Capacitors for the PC7457, 483 CBGA
1
C1-2
C1-1 C2-1 C3-1 C4-1 C5-1 C6-1
C6-2C5-2C4-2C3-2C2-2
C18-1
C18-2 C17-2 C16-2 C15-2 C14-2 C13-2
C13-1C14-1C15-1C16-1C17-1
C12-1
C12-2 C11-2 C10-2 C9-2 C8-2 C7-2
C7-1C8-1C9-1
C10-1C11-1
C19-2
C19-1 C20-1 C21-1 C22-1 C23-1 C24-1
C24-2C23-2C22-2C21-2C20-2
A1 CORNER
C1 GND OVDD
C2 GND VDD
C3 GND GVDD
C4 GND VDD
C5 GND VDD
C6 GND GVDD
C7 GND VDD
C8 GND VDD
C9 GND GVDD
C10 GND VDD
C11 GND VDD
C12 GND GVDD
C13 GND VDD
C14 GND VDD
C15 GND VDD
C16 GND OVDD
C17 GND VDD
C18 GND OVDD
C19 GND VDD
C20 GND VDD
C21 GND OVDD
C22 GND VDD
C23 GND VDD
C24 GND VDD
Capacitor
Pad Number
-1 -2
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5345C–HIREL–07/05
PC7447/57 [Preliminary]
15. Mechanical Dimensions for the PC7457, 483 HCTE
Figure 12-1 provides the mechanical dimensions and bottom surface nomenclature for the PC7457, 483 HCTE package.
Figure 15-1. Mechanical Dimensions and Bottom Surface Nomenclature for the PC7457, 483 HCTE Package
Notes: 1. Dimensioning and tolerancing per ASME Y14.5M, 1994
2. Dimensions in millimeters
3. Top side A1 corner index is a metallized feature with various shapes. Bottom side. A1 corner is designated with a ball miss-
ing from the array
CA
483X
A
B
C
D
E
F
G
H
J
K
L
M
N
P
R
T
B0.3
C
0.15
b
U
W
V
Y
AB
AA
123456 78910111213141516171819202122
Capacitor Region
A
0.15 A
0.35 A
A
A1
A2
A3
Millimeters
DIM MIN MAX
A 2.72 3.20
A1 0.80 1
A2 1.10 1.30
A3 – 0.6
b 0.82 0.93
D 29 BSC
D1 – 12.5
D2 8.5 –
D3 – 8.4
D4 10.9 11.1
e 1.27 BSC
E 29 BSC
E1 – 12.5
E2 8.5 –
E3 – 8.4
E4 9.55 9.75
0.2
2X
C
A1 CORNER
B
0.2
2X
D
E
E3
E2
E1
E4
D2
D4
D3 D1
1
50
5345C–HIREL–07/05
PC7447/57 [Preliminary]
16. Substrate Capacitors for the PC7457, 483 HCTE
Figure 16-1 shows the connectivity of the substrate capacitor pads for the PC7457, 483 HCTE. All capacitors are 100 nF.
Figure 16-1. Substrate Bypass Capacitors for the PC7457, 483 HCTE
1
C1-2
C1-1 C2-1 C3-1 C4-1 C5-1 C6-1
C6-2C5-2C4-2C3-2C2-2
C18-1
C18-2 C17-2 C16-2 C15-2 C14-2 C13-2
C13-1C14-1C15-1C16-1C17-1
C12-1
C12-2 C11-2 C10-2 C9-2 C8-2 C7-2
C7-1C8-1C9-1
C10-1C11-1
C19-2
C19-1 C20-1 C21-1 C22-1 C23-1 C24-1
C24-2C23-2C22-2C21-2C20-2
A1 CORNER
C1 GND OVDD
C2 GND VDD
C3 GND GVDD
C4 GND VDD
C5 GND VDD
C6 GND GVDD
C7 GND VDD
C8 GND VDD
C9 GND GVDD
C10 GND VDD
C11 GND VDD
C12 GND GVDD
C13 GND VDD
C14 GND VDD
C15 GND VDD
C16 GND OVDD
C17 GND VDD
C18 GND OVDD
C19 GND VDD
C20 GND VDD
C21 GND OVDD
C22 GND VDD
C23 GND VDD
C24 GND VDD
Capacitor
Pad Number
-1 -2
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17. System Design Information
This section provides system and thermal design recommendations for successful application of
the PC7457.
17.1 Clocks
The following sections provide more detailed information regarding the clocking o fthe PC7457.
17.1.1 Core Clocks and PLL Configuration
The PC7457 PLL is configured by the PLL_CFG[0:4] signals. For a given SYSCLK (bus) fre-
quency, the PLL configuration signals set the internal CPU and VCO frequency of operation.
The PLL configuration for the PC7457 is shown in Table 17-1 for a set of example frequencies.
In this example, shaded cells represent settings that, for a given SYSCLK frequency, result in
core and/or VCO frequencies that do not comply with the 1-GHz column in Table 7-2 on page
20. Note that these configurations were different in some earlier PC7450-family devices and
care should be taken when upgrading to the PC7457 to verify the correct PLL settings for an
application.
Table 17-1. PC7457 Microprocessor PLL Configuration Example for 1267 MHz Parts
PLL_CFG[0:4]
Bus-to-Core
Multiplier
Core-to-VCO
Multiplier
Example Bus-to-Core Frequency in MHz (VCO Frequency in MHz)
Bus (SYSCLK) Frequency
33.3
MHz
50
MHz
66.6
MHz
75
MHz
83
MHz
100
MHz
133
MHz
167
MHz
01000 2x 2x
10000 3x 2x
10100 4x 2x 667
(1333)
10110 5x 2x 667
(1333)
835
(1670)
10010 5.5x 2x 733
(1466)
919
(1837)
11010 6x 2x 600
(1200)
800
(1600)
1002
(2004)
01010 6.5x 2x 650
(1300)
866
(1730)
1086
(2171)
00100 7x 2x 700
(1400)
931
(1862)
1169
(2338)
00010 7.5x 2x 623
(1245)
750
(1500)
1000
(2000)
1253
(2505)
11000 8x 2x 600
(1200)
664
(1328)
800
(1600)
1064
(2128)
01100 8.5x 2x 638
(1276)
706
(1412)
850
(1700)
1131
(2261)
01111 9x 2x 600
(1200)
675
(1350)
747
(1494)
900
(1800)
1197
(2394)
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Notes: 1. PLL_CFG[0:4] settings not listed are reserved.
01110 9.5x 2x 633
(1266)
712
(1524)
789
(1578)
950
(1900)
1264
(2528)
10101 10x 2x 667
(1333)
750
(1500)
830
(1660)
1000
(2000)
10001 10.5x 2x 700
(1400)
938
(1876)
872
(1744)
1050
(2100)
10011 11x 2x 733
(1466)
825
(1650)
913
(1826)
1100
(2200)
00000 11.5x 2x 766
(532)
863
(1726)
955
(1910)
1150
(2300)
10111 12x 2x 600
(1200)
800
(1600)
900
(1800)
996
(1992)
1200
(2400)
11111 12.5x 2x 600
(1200)
833
(1666)
938
(1876)
1038
(2076)
1250
(2500)
01011 13x 2x 650
(1300)
865
(1730)
975
(1950)
1079
(2158)
11100 13.5x 2x 675
(1350)
900
(1800)
1013
(2026)
1121
(2242)
11001 14x 2x 700
(1400)
933
(1866)
1050
(2100)
1162
(2324)
00011 15x 2x 750
(1500)
1000
(2000)
1125
(2250)
1245
(2490)
11011 16x 2x 800
(1600)
1066
(2132)
1200
(2400)
00001 17x 2x 850
(1900)
1132
(2264)
00101 18x 2x 600
(1200)
900
(1800)
1200
(2400)
00111 20x 2x 667
(1334)
1000
(2000)
01001 21x 2x 700
(1400)
1050
(2100)
01101 24x 2x 800
(1600)
1200
(2400)
11101 28x 2x 933
(1866)
00110 PLL bypass PLL off, SYSCLK clocks core circuitry directly
11110 PLL off PLL off, no core clocking occurs
Table 17-1. PC7457 Microprocessor PLL Configuration Example for 1267 MHz Parts (Continued)
PLL_CFG[0:4]
Bus-to-Core
Multiplier
Core-to-VCO
Multiplier
Example Bus-to-Core Frequency in MHz (VCO Frequency in MHz)
Bus (SYSCLK) Frequency
33.3
MHz
50
MHz
66.6
MHz
75
MHz
83
MHz
100
MHz
133
MHz
167
MHz
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2. The sample bus-to-core frequencies shown are for reference only. Some PLL configurations may select bus, core, or VCO
frequencies which are not useful, not supported, or not tested for by the PC7455; See “Clock AC Specifications” on page 20.
for valid SYSCLK, core, and VCO frequencies.
3. In PLL-bypass mode, the SYSCLK input signal clocks the internal processor directly and the PLL is disabled. However, the
bus interface unit requires a 2x clock to function. Therefore, an additional signal, EXT_QUAL, must be driven at one-half the
frequency of SYSCLK and offset in phase to meet the required input setup tIVKH and hold time tIXKH (see Table 7-3 on page
22). The result is that the processor bus frequency is one-half SYSCLK while the internal processor is clocked at SYSCLK
frequency. This mode is intended for factory use and emulator tool use only.
Note: The AC timing specifications given in this document do not apply in PLL-bypass mode.
4. In PLL-off mode, no clocking occurs inside the PC7455 regardless of the SYSCLK input.
17.1.2 L3 Clocks
The PC7457 generates the clock for the external L3 synchronous data SRAMs by dividing the
core clock frequency of the PC7457. The core-to-L3 frequency divisor for the L3 PLL is selected
through the L3_CLK bits of the L3CR register. Generally, the divisor must be chosen according
to the frequency supported by the external RAMs, the frequency of the PC7457 core, and timing
analysis of the circuit board routing. Table 17-2 shows various example L3 clock frequencies
that can be obtained for a given set of core frequencies.
Notes: 1. The core and L3 frequencies are for reference only. Note that maximum L3 frequency is design dependent. Some examples
may represent core or L3 frequencies which are not useful, not supported, or not tested for the PC7457; see ”L3 Clock AC
Specifications” on page 24 for valid L3_CLK frequencies and for more information regarding the maximum L3 frequency.
2. Not all core frequencies are supported by all speed grades; see Table 7-2 on page 20 for minimum and maximum core fre-
quency specifications.
Table 17-2. Sample Core-to-L3 Frequencies(1)
Core
Frequency
(MHz) ÷2÷2.5÷3÷3.5÷4÷4.5÷5÷5.5÷6÷6.5÷7÷7.5÷8
500 250 200 167 143 125 111 100 91 83 77 71 67 63
533 266 213 178 152 133 118 107 97 89 82 76 71 67
550 275 220 183 157 138 122 110 100 92 85 79 73 69
600 300 240 200 171 150 133 120 109 100 92 86 80 75
650 325 260 217 186 163 144 130 118 108 100 93 87 81
666 333 266 222 190 167 148 133 121 111 102 95 89 83
700 350 280 233 200 175 156 140 127 117 108 100 93 88
733 367 293 244 209 183 163 147 133 122 113 105 98 92
800 400 320 266 230 200 178 160 145 133 123 114 107 100
866 433 347 289 248 217 192 173 157 145 133 124 115 108
933 467 373 311 266 233 207 187 170 156 144 133 124 117
1000 500 400 333 285 250 222 200 182 166 154 143 133 125
1050(2) 525 420 350 300 263 233 191 191 175 162 150 140 131
1100(2) 550 440 367 314 275 244 200 200 183 169 157 147 138
1150(2) 575 460 383 329 288 256 209 209 192 177 164 153 144
1200(2) 600 480 400 343 300 267 218 218 200 185 171 160 150
1250(2) 638 500 417 357 313 278 227 227 208 192 179 167 156
1300(2) 650 520 433 371 325 289 236 236 217 200 186 173 163
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17.1.3 System Bus Clock (SYSCLK) and Spread Spectrum Sources
Spread spectrum clock sources are an increasingly popular way to control electromagnetic inter-
ference emissions (EMI) by spreading the emitted noise to a wider spectrum and reducing the
peak noise magnitude in order to meet industry and government requirements. These clock
sources intentionally add long-term jitter in order to diffuse the EMI spectral content. The jitter
specification given in Table 7-2 on page 20 considers short-term (cycle-to-cycle) jitter only and
the clock generator’s cycle-to-cycle output jitter should meet the PC7457 input cycle-to-cycle jit-
ter requirement. Frequency modulation and spread are separate concerns, and the PC7457 is
compatible with spread spectrum sources if the recommendations listed in Table 20 are
observed.
Notes: 1. Guaranteed by design.
2. SYSCLK frequencies resulting from frequency spreading, and the resulting core and VCO fre-
quencies, must meet the minimum and maximum specifications given in Table 7-2 on page 20.
It is imperative to note that the processor’s minimum and maximum SYSCLK, core, and VCO
frequencies must not be exceeded regardless of the type of clock source. Therefore, systems in
which the processor is operated at its maximum rated core or bus frequency should avoid violat-
ing the stated limits by using down-spreading only.
17.2 PLL Power Supply Filtering
The AVDD power signal is provided on the PC7457 to provide power to the clock generation PLL.
To ensure stability of the internal clock, the power supplied to the AVDD input signal should be fil-
tered of any noise in the 500_kHz to 10 MHz resonant frequency range of the PLL. A circuit
similar to the one shown in Figure 13-1 using surface mount capacitors with minimum effective
series inductance (ESL) is recommended.
The circuit should be placed as close as possible to the AVDD pin to minimize noise coupled from
nearby circuits. It is often possible to route directly from the capacitors to the AVDD pin, which is
on the periphery of the 360 CBGA footprint and very close to the periphery of the 483 CBGA
footprint, without the inductance of vias.
Figure 17-1. PLL Power Supply Filter Circuit
Previous revisions of this document required a 400Ω. resistor for Rev. 1.1 (Rev. B) devices
instead of the 10Ω. resistor shown above. All production devices require a 10Ω. resistor. For
more information, see the PC7450 Family Chip Errata for the PC7457 and PC7447.
Table 17-3. Spread Specturm Clock Source Recommendations (at Recommended Operating
Conditions, see page 12.)
Parameter Min Max Unit Notes
Frequency modulation – 50 kHz (1)
Frequency spread – 1.0 % (1)(2)
VDD
400Ω
2.2 µF2.2 µF
GND
AVDD
Low ESL surface mount capacitor
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17.3 Decoupling Recommendations
Due to the PC7457 dynamic power management feature, large address and data buses, and
high operating frequencies, the PC7457 can generate transient power surges and high fre-
quency noise in its power supply, especially while driving large capacitive loads. This noise must
be prevented from reaching other components in the PC7457 system, and the PC7457 itself
requires a clean, tightly regulated source of power. Therefore, it is recommended that the sys-
tem designer place at least one decoupling capacitor at each VDD, OVDD, and GVDD pin of the
PC7457. It is also recommended that these decoupling capacitors receive their power from sep-
arate VDD, OVDD/GVDD, and GND power planes in the PCB, utilizing short traces to minimize
inductance.
These capacitors should have a value of 0.01 or 0.1 µF. Only ceramic surface mount technology
(SMT) capacitors should be used to minimize lead inductance, preferably 0508 or 0603 orienta-
tions where connections are made along the length of the part. Consistent with the
recommendations of Dr. Howard Johnson in High Speed Digital Design: A Handbook of Black
Magic (Prentice Hall, 1993) and contrary to previous recommendations for decoupling Freescale
microprocessors, multiple small capacitors of equal value are recommended over using multiple
values of capacitance.
In addition, it is recommended that there be several bulk storage capacitors distributed around
the PCB, feeding the VDD, GVDD, and OVDD planes, to enable quick recharging of the smaller
chip capacitors. These bulk capacitors should have a low equivalent series resistance (ESR) rat-
ing to ensure the quick response time necessary. They should also be connected to the power
and ground planes through two vias to minimize inductance. Suggested bulk capacitors: 100 –
330 µF (AVX TPS tantalum or Sanyo OSCON).
17.4 Connection Recommendations
To ensure reliable operation, it is highly recommended to connect unused inputs to an appropri-
ate signal level. Unused active low inputs should be tied to OVDD. Unused active high inputs
should be connected to GND. All NC (no-connect) signals must remain unconnected. Power and
ground connections must be made to all external VDD, OVDD, GVDD, and GND pins in the
PC7457. If the L3 interface is not used, GVDD should be connected to the OVDD power plane,
and L3VSEL should be connected to BVSEL; the remainder of the L3 interface may be left
unterminated.
17.5 Output Buffer DC Impedance
The PC7457 processor bus and L3 I/O drivers are characterized over process, voltage, and
temperature.
To measure Z0, an external resistor is connected from the chip pad to OVDD or GND. Then, the
value of each resistor is varied until the pad voltage is OVDD/2 (see Figure 14-1 on page 48).
The output impedance is the average of two components, the resistances of the pull-up and pull-
down devices. When data is held low, SW2 is closed (SW1 is open), and RN is trimmed until the
voltage at the pad equals OVDD/2. RN then becomes the resistance of the pull-down devices.
When data is held high, SW1 is closed (SW2 is open), and RP is trimmed until the voltage at the
pad equals OVDD/2. RP then becomes the resistance of the pull-up devices. RP and RN are
designed to be close to each other in value. Then, Z0 = (RP + RN)/2.
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Figure 17-2. Driver Impedance Measurement
Table 17-4 summarizes the signal impedance results. The impedance increases with junction
temperature and is relatively unaffected by bus voltage.
17.6 Pull-up/Pull-down Resistor Requirements
The PC7457 requires high-resistive (weak: 4.7 kΩ) pull-up resistors on several control pins of
the bus interface to maintain the control signals in the negated state after they have been
actively negated and released by the PC7457 or other bus masters. These pins are TS, ARTRY,
SHDO, and SHD1.
Some pins designated as being for factory test must be pulled up to OVDD or down to GND to
ensure proper device operation. For the PC7447, 360 BGA, the pins that must be pulled up to
OVDD are LSSD_MODE and TEST[0:3]; the pins that must be pulled down to GND are
L1_TSTCLK and TEST[4]. For the PC7457, 483 BGA, the pins that must be pulled up to OVDD
are LSSD_MODE and TEST[0:5]; the pins that must be pulled down are L1_TSTCLK and
TEST[6]. The CKSTP_IN signal should likewise be pulled up through a pull-up resistor (weak or
stronger: 4.7 – 1 kΩ) to prevent erroneous assertions of this signal. In addition, the PC7457 has
one open-drain style output that requires a pull-up resistor (weak or stronger: 4.7 – 1 kΩ) if it is
used by the system. This pin is CKSTP_OUT.
If pull-down resistors are used to configure BVSEL or L3VSEL, the resistors should be less than
250Ω (see Table 11-1 on page 38). Because PLL_CFG[0:4] must remain stable during normal
operation, strong pull-up and pull-down resistors (1 kΩ or less) are recommended to configure
these signals in order to protect against erroneous switching due to ground bounce, power sup-
ply noise or noise coupling.
Table 17-4. Impedance Characteristics with VDD = 1.5V, OVDD = 1.8V ±5%, Tj = 5° - 85°C
Impedance Processor bus L3 Bus Unit
Z0
Typical 33 – 42 34 – 42 Ω
Maximum 31 – 51 32 – 44 Ω
OVDD
OGND
SW2
SW1
RN
RP
Pad
Data
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During inactive periods on the bus, the address and transfer attributes may not be driven by any
master and may, therefore, float in the high-impedance state for relatively long periods of time.
Because the PC7457 must continually monitor these signals for snooping, this float condition
may cause excessive power draw by the input receivers on the PC7457 or by other receivers in
the system. It is recommended that these signals be pulled up through weak (4.7 kΩ) pull-up
resistors by the system, or that they may be otherwise driven by the system during inactive peri-
ods of the bus. The snooped address and transfer attribute inputs are A[0:35], AP[0:4], TT[0:4],
CI, WT, and GBL.
If extended addressing is not used, A[0:3] are unused and must be pulled low to GND through
weak pull-down resistors. If the PC7457 is in 60x bus mode, DTI[0:3] must be pulled low to GND
through weak pull-down resistors.
The data bus input receivers are normally turned off when no read operation is in progress and,
therefore, don’t require pull-up resistors on the bus. Other data bus receivers in the system, how-
ever, may require pull-ups, or that those signals be otherwise driven by the system during
inactive periods by the system. The data bus signals are D[0:63] and DP[0:7].
If address or data parity is not used by the system, and the respective parity checking is disabled
through HID0, the input receivers for those pins are disabled, and those pins don’t require pull-up
resistors and should be left unconnected by the system. If all parity generation is disabled
through HID0, then all parity checking should also be disabled through HID0, and all parity pins
may be left unconnected by the system.
The L3 interface does not normally require pull-up resistors.
17.7 JTAG Configuration Signals
Boundary-scan testing is enabled through the JTAG interface signals. The TRST signal is
optional in the IEEE 1149.1 specification, but is provided on all processors that implement the
PowerPC architecture. While it is possible to force the TAP controller to the reset state using
only the TCK and TMS signals, more reliable power-on reset performance will be obtained if the
TRST signal is asserted during power-on reset. Because the JTAG interface is also used for
accessing the common on-chip processor (COP) function, simply tying TRST to HRESET is not
practical.
The COP function of these processors allows a remote computer system (typically, a PC with
dedicated hardware and debugging software) to access and control the internal operations of
the processor. The COP interface connects primarily through the JTAG port of the processor,
with some additional status monitoring signals. The COP port requires the ability to indepen-
dently assert HRESET or TRST in order to fully control the processor. If the target system has
independent reset sources, such as voltage monitors, watchdog timers, power supply failures, or
push-button switches, then the COP reset signals must be merged into these signals with logic.
The arrangement shown in Figure 17-1 allows the COP port to independently assert HRESET or
TRST, while ensuring that the target can drive HRESET as well. If the JTAG interface and COP
header will not be used, TRST should be tied to HRESET through a 0Ω isolation resistor so that
it is asserted when the system reset signal (HRESET) is asserted, ensuring that the JTAG scan
chain is initialized during power-on. While Freescale recommends that the COP header be
designed into the system as shown in Figure 17-1 on page 54, if this is not possible, the isolation
resistor will allow future access to TRST in the case where a JTAG interface may need to be
wired onto the system in debug situations.
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The COP header shown in Figure 17-1 adds many benefits – breakpoints, watchpoints, register
and memory examination/modification, and other standard debugger features are possible
through this interface – and can be as inexpensive as an unpopulated footprint for a header to
be added when needed.
The COP interface has a standard header for connection to the target system, based on the
0.025" square-post, 0.100" centered header assembly (often called a Berg header). The con-
nector typically has pin 14 removed as a connector key.
There is no standardized way to number the COP header shown in Figure 17-1; consequently,
many different pin numbers have been observed from emulator vendors. Some are numbered
top-to-bottom then left-to-right, while others use left-to-right then top-to-bottom, while still others
number the pins counter clockwise from pin 1 (as with an IC). Regardless of the numbering, the
signal placement recommended in Figure 17-1 is common to all known emulators.
The QACK signal shown in Figure 17-1 is usually connected to the PCI bridge chip in a system
and is an input to the PC7457 informing it that it can go into the quiescent state. Under normal
operation this occurs during a low-power mode selection. In order for COP to work, the PC7457
must see this signal asserted (pulled down). While shown on the COP header, not all emulator
products drive this signal. If the product does not, a pull-down resistor can be populated to
assert this signal. Additionally, some emulator products implement open-drain type outputs and
can only drive QACK asserted; for these tools, a pull-up resistor can be implemented to ensure
this signal is deasserted when it is not being driven by the tool. Note that the pull-up and pull-
down resistors on the QACK signal are mutually exclusive and it is never necessary to populate
both in a system. To preserve correct power-down operation, QACK should be merged via logic
so that it also can be driven by the PCI bridge.
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Figure 17-3. JTAG Interface Connection
Notes: 1. RUN/STOP, normally found on pin 5 of the COP header, is not implemented on the PC7457. Connect pin 5 of the COP
header to OVDD with a 10 kΩ pull-up resistor.
2. Key location; pin 14 is not physically present on the COP header.
3. Component not populated. Populate only if debug tool does not drive QACK.
4. Populate only if debug tool uses an open-drain type output and does not actively deassert QACK.
5. If the JTAG interface is implemented, connect HRESET from the target source to TRST from the COP header though an
AND gate to TRST of the part. If the JTAG interface is not implemented, connect HRESET from the target source to TRST of
the part through a 0Ω isolation resistor.
6. Though defined as a No-Connect, it is a common and recommended practice to use pin 12 as an additional GND pin for
improved signal integrity.
HRESET HRESET
HRESET
13
SRESET
SRESET SRESET
11
VDD_SENSE
6
5(1)
15
2 kΩ10 kΩ
10 kΩ
10 kΩ
OVDD
OVDD
OVDD
OVDD
CHKSTP_IN CHKSTP_IN
8TMS
TDO
TDI
TCK
TMS
TDO
TDI
TCK
9
1
3
4TRST
7
16
2
10
14(2)
Key
QACK
OVDD
OVDD
OVDD
TRST
10 kΩ
10 kΩ
10 kΩ
10 kΩ
OVDD
QACK
QACK
CHKSTP_OUT
CHKSTP_OUT
3
13
9
5
1
6
10
2
15
11
7
16
12
8
4
KEY
No Pin
COP Connector
Physical Pin Out
10 kΩ(4)
OVDD
1
2 kΩ(3)
0Ω(5)
12(6)
NC
From Target
Board Sources
(if any)
COP Header
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18. Definitions
18.1 Life Support Applications
These products are not designed for use in life support appliances, devices or systems where
malfunction of these products can reasonably be expected to result in personal injury. Atmel
customers using or selling these products for use in such applications do so at their own risk and
agree to fully indemnify Atmel for any damages resulting from such improper use or sale.
19. Ordering Information
Note: 1. For availability of the different versions, contact your local Atmel sales office.
PC 7457 V G U 1000 Lx
Prefix
Type
Screening Level(1)
U: Upscreening
Revision Level(1)
Rev. C
Application modifier(1)
L: 1.3V ± 50 mV
N: 1.1V ± 50 mV
Max internal processor speed(1)
933 MHz
1000 MHz
1200 MHz (TBC)
Temperature Range: Tj(1)
Prototype
(X)
V: -40˚C, 110˚C
M: -55˚C +125˚C
Package
G: CBGA
GH: HiTCE
PC 7447 V G U 1000 Lx
Prefix
Type
Screening Level(1)
U: Upscreening
Revision Level(1)
Rev. B
Application modifier(1)
L: 1.3V ± 50 mV
N: 1.1V ± 50 mV
Max internal processor speed(1)
933 MHz
1000 MHz
1200 MHz (TBC)
Temperature Range: Tj(1)
Prototype
(X)
V: -40˚C, 110˚C
M: -55˚C +125˚C
Package
G: CBGA
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20. Document Revision History
Table 20-1 provides a revision history for this hardware specification.
Table 20-1. Document Revision History
Revision
Number Date Substantive Change(s)
C 06/2005
Updated document to new Atmel template
Updated section numbering and changed reference from part number specifications to addendums
Added Rev. 1.2 devices, including increased L3 clock max frequency to 250 MHz and improved L3 AC
timing
Table 6-2 on page 13: Added CTE information
Table 7-2 on page 20: Modified jitter specifications to conform to JEDEC standards, changed jitter
specification to cycle-to-cycle jitter (instead of long- and short-term jitter); changed jitter bandwidth
recommendations
Table 7-7 on page 29: Deleted note 9 and renumbered.
Table 7-8 on page 31: Deleted note 5 and renumbered
Table 12-1 on page 44: Revised note 6
Added Section 17.1.3 ”System Bus Clock (SYSCLK) and Spread Spectrum Sources” on page 54
Section 17.2 ”PLL Power Supply Filtering” on page 54: Changed filter resistor recommendations.
Recommend 10Ω resistor for all production devices, including production Rev. 1.1 devices. 400Ω resistor
needed only for early Rev. 1.1 devices.
Table 20-1: Reversed the order of revision numbers.
Section 17.1.1 on page 51: Corrected note regarding different PLL configurations for earlier devices; all
PC7457 devices to date conform to this table
Section 17.6 on page 56: Added information about unused L3_ADDR signals.
HCTE package information
Preliminary specification α-site release subsequent to preliminary specification β-site
Motorola changed to Freescale
B 11/2004
Figure 7-3 on page 22: Corrected pin lists for input and output AC timing to correctly show HIT as an output-
only signal
Added specifications for 1267 MHz devices; removed specs for 1300 MHz devices.
Changed recommendations regarding use of L3 clock jitter in AC timing analysis in Section ”L3 Clock AC
Specifications” on page 24; the L3 jitter is now fully comprehended in the AC timing specs and does not
need to be included in the timing analysis
i
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PC7447/57 [Preliminary]
Table of Contents
Features .................................................................................................... 1
Description ............................................................................................... 1
Screening .................................................................................................. 2
1 Block Diagram .......................................................................................... 3
2 General Parameters ................................................................................. 4
3 Overview ................................................................................................... 4
4 Signal Description ................................................................................. 10
5 Detailed Specification ............................................................................ 11
6 Applicable Documents .......................................................................... 11
6.1 Design and Construction ........................................................................................11
6.2 Thermal Characteristics .........................................................................................13
7 Electrical Characteristics ...................................................................... 19
7.1 Static Characteristics ..............................................................................................19
7.2 Dynamic Characteristics .........................................................................................20
8 Preparation for Delivery ........................................................................ 36
8.1 Handling .................................................................................................................36
9 Package Mechanical Data ..................................................................... 36
9.1 Package Parameters for the PC7447, 360 CBGA .................................................36
10 Pin Assignment ...................................................................................... 37
11 Pinout Listings ....................................................................................... 38
12 Mechanical Dimensions for the PC7447, 360 CBGA .......................... 41
12.1 Package Parameters for the PC7457, 483 CBGA and 483 HCTE .......................42
13 Mechanical Dimensions for the PC7457, 483 CBGA .......................... 47
14 Substrate Capacitors for the PC7457, 483 CBGA ............................... 48
15 Mechanical Dimensions for the PC7457, 483 HCTE ........................... 49
16 Substrate Capacitors for the PC7457, 483 HCTE ................................ 50
17 System Design Information .................................................................. 51
17.1 Clocks ...................................................................................................................51
ii
5345C–HIREL–07/05
PC7447/57 [Preliminary]
17.2 PLL Power Supply Filtering ..................................................................................54
17.3 Decoupling Recommendations ............................................................................55
17.4 Connection Recommendations ............................................................................55
17.5 Output Buffer DC Impedance ...............................................................................55
17.6 Pull-up/Pull-down Resistor Requirements ............................................................56
17.7 JTAG Configuration Signals .................................................................................57
18 Definitions .............................................................................................. 60
18.1 Life Support Applications ......................................................................................60
19 Ordering Information ............................................................................. 60
20 Document Revision History .................................................................. 61
Printed on recycled paper.
5345C–HIREL–07/05 xM
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