Numonyx™ StrataFlash® Embedded Memory (J3-65nm)
Datasheet December 2008
14 319942-02
4.0 Signal Descriptions
Tab le 4 lists the active signals used on J3-65nm and provides a description of each.
Table 4: TSOP & Easy BGA Signal Descriptions
Symbol Type Name and Function
A0 Input
BYTE-SELECT ADDRESS: Selects between high and low byte when the device is in x8 mode. This
address is latched during a x8 program cycle. Not used in x16 mode (i.e., the A0 input buffer is
turned off when BYTE# is high).
A[MAX:1] Input
ADDRESS INPUTS: Inputs for addresses during read and program operations. Addresses are
internally latched during a program cycle:
256-Mbit — A[24:1]
DQ[7:0] Input/
Output
LOW-BYTE DATA BUS: Inputs data during buffer writes and programming, and inputs commands
during CUI writes. Outputs array, CFI, identifier, or status data in the appropriate read mode. Data
is internally latched during write operations.
DQ[15:8] Input/
Output
HIGH-BYTE DATA BUS: Inputs data during x16 buffer writes and programming operations.
Outputs array, CFI, or identifier data in the appropriate read mode; not used for Status Register
reads. Data is internally latched during write operations in x16 mode. DQ[15:8] float in x8 mode
CE[2:0] Input
CHIP ENABLE: Activate the 256-Mbit devices’ control logic, input buffers, decoders, and sense
amplifiers. When the device is de-selected (see Table 6, “Chip Enable Truth Table for
256-Mb” on page 15), power reduces to standby levels.
All timing specifications are the same for these three signals. Device selection occurs with the
falling edge of CE0, CE1, or CE2 that enables the device. Device deselection occurs with the rising
edge of CE0, CE1, or CE2 that disables the device (see Table 6, “Chip Enable Truth Table
for 256-Mb” on page 15).
RP# Input
RESET: RP#-low resets internal automation and puts the device in power-down mode. RP#-high
enables normal operation. Exit from reset sets the device to read array mode. When driven low,
RP# inhibits write operations which provides data protection during power transitions.
OE# Input OUTPUT ENABLE: Activates the device’s outputs through the data buffers during a read cycle.
OE# is active low.
WE# Input WRITE ENABLE: Controls writes to the CUI, the Write Buffer, and array blocks. WE# is active low.
Addresses and data are latched on the rising edge of WE#.
STS Open Drain
Output
STATUS: Indicates the status of the internal state machine. When configured in level mode
(default), it acts as a RY/BY# signal. When configured in one of its pulse modes, it can pulse to
indicate program and/or erase completion. For alternate configurations of the Status signal, see the
Configurations command and Section 11.2, “Status Signal” on page 31. STS is to be
tied to VCCQ with a pull-up resistor.
BYTE# Input
BYTE ENABLE: BYTE#-low places the device in x8 mode; data is input or output on DQ[7:0], while
DQ[15:8] is placed in High-Z. Address A0 selects between the high and low byte. BYTE#-high
places the device in x16 mode, and turns off the A0 input buffer. Address A1 becomes the lowest-
order address bit.
VPEN Input
ERASE / PROGRAM / BLOCK LOCK ENABLE: For erasing array blocks, programming data, or
configuring lock-bits.
With VPEN ≤ VPENLK, memory contents cannot be altered.
VCC Power
CORE Power Supply: Core (logic) source voltage. Writes to the flash array are inhibited when VCC
≤ VLKO.
Caution: Device operation at invalid Vcc voltages should not be attempted.
VCCQ Power I/O Power Supply: Power supply for Input/Output buffers.This ball can be tied directly to VCC.
GND/VSS Supply GROUND: Ground reference for device logic voltages. Connect to system ground.
NC — No Connect: Lead is not internally connected; it may be driven or floated.
RFU — Reserved for Future Use: Balls designated as RFU are reserved by Numonyx for future device
functionality and enhancement.