SMSC TMC2074 PRODUCT PREVIEW Revision 0.2 (10-23-08)
Data Brief
PRODUCT FEATURES
TMC2074
Dual Mode CircLinkTM
Controller
Low Power CMOS, 3.3 Volt Power Supply with 5 Volt
Tolerant I/O
Supports 8/16-Bit Data Bus
— Both 86xx and 68hxx Platforms
1K On-chip Dual Port Buffer Memory
— Sequential I/O Mapped Access
Enhanced Token Passing Protocol from ARCNET
— Maximum 31 Nodes per Network
— Token Retry Mechanism
— Maximum 256 Bytes per Packet
— Consecutive Node ID Assignment
Memory Mirror
— Shared Memory within Network
Network Standard Time
— Network Time Synchronization
— Automatic Time Stamping
Coded Mark Inversion
— Intelligent 1-Bit Error Correction
— Magnetic Saturation Prevention
Dual Operation Modes
— Peripheral (Host) Mode Operates with MCU
— Standalone (I/O) Mode Operates without MCU
Supports 8 Bit Programmable General Purpose I/O at
peripheral Mode
Supports 16 Bit Input and 16 Bit Output at Standalone
Mode
Dual Communication Modes (with Peripheral Mode)
— Free Format Mode
— Remote Buffer Mode
3 Port Hub Integrated
— 1 Internal and 2 External
Flexible Topologies
— Bus, Star and Tree
Low Cost Media can be Used
— RS485 Differential Driver
Fiber Optics and Twisted Pair Cable Supported
128-Pin, VTQFP Lead-Free RoHS Compliant
Package
Temperature Range from 0 to 70 Degrees C
ORDER NUMBER:
TMC2074-NU FOR 128 PIN, VTQFP LEAD-FREE ROHS COMPLIANT PACKAGE
80 ARKAY DRIVE, HAUPPAUGE, NY 11788 (631) 435-6000, FAX (631) 273-3123
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Dual Mode CircLinkTM Controller
Revision 0.2 (10-23-08) 2 SMSC TMC2074
PRODUCT PREVIEW
Dual Mode CircLinkTM Controller
SMSC TMC2074 3 Revision 0.2 (10-23-08)
PRODUCT PREVIEW
General Description
About CircLink
The CircLink networking controller was developed for small control-oriented local network data
communication based on ARCNET's token-passing protocol that guarantees message integrity and
calculatable maximum cycle time.
In a CircLink network, when a node receives the token it becomes the temporary master of the network
for a fixed, short period of time. No node can dominate the network since token control must be
relinquished when transmission is complete. Once a transmission is completed the token is passed on
to the next node (logical neighbor), allowing it to be come the master.
Because of this token passing scheme, maximum waiting time for network access can be calculated
and the time performance of the network is predictable or deterministic. Control networking applications
require predictable performance to ensure that controlled events occur when required. However,
reconfiguration of a regular ARCNET network becomes necessary when the token is missed due to
electronic and magnetic noise. In these cases, the maximum wait time for sending datagrams cannot
be guaranteed and the real-time characteristic is impaired. CircLink makes several modification to the
original ARCNET protocol (such as maximum and consecutive node ID assignment) to avoid token
missing as much as possible and reduce the network reconfiguration time.
CircLink implements other enhancements to the ARCNET protocol including a smaller-sized network ,
shorter packet size, and remote buffer mode operation that enable more efficient and reliable small,
control-oriented LANs. In addition, CircLink introduces several unique features for reducing overall
system cost while increasing system reliability.
CircLink can operate under a special mode called "Standalone" or "I/O" mode. In this mode, CircLink
does not need an administrating CPU for each node. Only one CPU is needed to manage a CircLink
network composed up to maximum 31 nodes, reducing cost and complexity.
In a CircLink network, the data sent by the source node is received by all other nodes in the network
and stored according to node source ID. For the target node the received data is executed per
ARCNET flow control and the data is stored in its buffer RAM. The receiving node processes the data
while the remaining nodes on the network discard the data when the receiving node has completed.
This memory-mirroring function assures higher reliability and significantly reduces network traffic.
Network Standard Time (NST) is also a unique CircLink feature. NST is realized by synchronizing the
individual local time on each network node to the clock master in the designated node from which the
packet is sent. CircLink also uses CMI code for transmitting signals, rather than the dipulse or bipolar
signals that are the standard ARCNET signals. Since CMI encoding eliminates the DC element, a
simple combination of a standard RS485 IC and a pulse transformer can be used to implement a
transformer-coupled network.
Dual Mode CircLinkTM Controller
Revision 0.2 (10-23-08) 4 SMSC TMC2074
PRODUCT PREVIEW
About TMC2074
The TMC2074 network controller is CircLink technology's flagship product. The TMC2074's flexibility
and rich feature set enable a high-reliability and high-performance, real-time and control-oriented
network without the cumbersome middle layer protocol stacks and complex packet prioritization
schemes typically required.
TMC2074 operates at network data transfer rates up to 5 Mbps. Its embedded 1 kByte RAM can be
configured into a maximum of 32 pages to implement a 31-node network where each node in the
network has the same local memory.
The TMC2074 has two operational modes: "Peripheral Mode" and "Standalone Mode". It can operate
with or without the existence of a system CPU on a network node. In Peripheral Mode, the TMC2074
has two selectable communication modes, "Free Format Mode" and "Remote Buffer Mode". Free
Format mode, retained from ARCNET, is "packet oriented" communication. Remote Buffer mode
communication is a CircLink-specific feature, and is a token oriented communication, which includes
automatic data transmission when the token arrives.
The TMC2074 has a flexible 8-bit or 16-bit databus to interface various CPU types including X86,
68XX, and SHX with multiplexed or non-multiplexed address/data. When operating in Peripheral mode,
the TMC2074 has 8-bit programmable I/O available. When operating in Standalone mode, the
TMC2074's I/O configuration is16-bit. The TMC2074 also integrates a 3-port hub (two ports for external
connection) to accommodate various network topologies (Bus, Star, etc.) and combinations.
Dual Mode CircLinkTM Controller
SMSC TMC2074 5 Revision 0.2 (10-23-08)
PRODUCT PREVIEW
Block Diagram
Figure 1 TMC2074 Internal Block Diagram
Mode Setting
Register Access
Control Circuit
Interrupt Status
Interrupt Mask
EC Command
Receive Mode(#01-#31)
Receive Flag(#01-#31)
Clock Master SID
Net. Standard Time
Alarm Setting
Receive SID
Search SID
MAX ID Setting (MAXID)
Node ID Setting (NID)
Page Size Setting (PS)
Data Rate Setting
Address pointer
Page Register
Address Register
Diag. Register
Data Register H
Data Register L
Data Latch
TENT-ID Register
CONFIG Register
SETUP Registers
Address
Multiplexer Address Pointer
Data Latch Shift Register
RX Synchro-
nous circuit
TX Signal
Generator
CMI Decode CMI Encode
CMI Synchro
TXEN TXD RXIN
Buffer Memory
512B 512B
Improved ARCNET Protocol
Micro Sequencer
Working Registers
Memory Access Mediation Circuit
RECON Timer
OSC
Reset Circuit
Micro-Controller bus
MAXID NID PS CKP
nMUX nRWM W16 nSWAP
nSTALONE nDIAG
FLASHOnNSTCOUT
TXEN2 RXIN2
3Port HUB Circuit
ERR-INFO
PIN-INFO
nHUBON nCMIBYP
Others Clock
Dual Mode CircLinkTM Controller
Revision 0.2 (10-23-08) 6 SMSC TMC2074
PRODUCT PREVIEW
Package Outline
Figure 2 TMC2074 128-Pin VTQFP Package Diagram
Notes:
1. Controlling Unit: millimeter.
2. Package body dimensions D1 and E1 do not include the mold protrusion.
Maximum mold protrusion is 0.25 mm.
Table 1 TMC2074 128-Pin VTQFP Package Parameters
SYMBOL ITEMS MIN TYP MAX
AOverall Package Height - - 1.2
A1 Standoff 0.05 -0.15
A2 Body Thickness 0.95 - 1.05
DX Span 15.8 - 16.2
D1 X body Size 13.8 - 14.2
EY Span 15.8 - 16.2
E1 Y body Size 13.8 - 14.2
HLead Frame Thickness 0.09 - 0.2
LLead Foot Length 0.45 0.6 0.75
L1 Lead Length - 1.0 -
eLead Pitch 0.4 Basic
TLead Foot Angle 0 o -7
o
WLead Width 0.13 0.18 0.23
www Lead position Tolerance -0.035 -0.035
R1 Lead Shoulder Radius 0.08 - -
R2 Lead Foot Radius 0.08 -0.2
ccc Coplanarity - - 0.08
NPin count 128
www M
D1
D
N
E
E1
1
Ze
Zd
e
W
A
A2
A1
ccc
T
H
L
L1
R2
R1
0.25mm
