![](http://datasheet.mmic.net.cn/170000/S71PL191HB0BFI100_datasheet_9723326/S71PL191HB0BFI100_58.png)
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S29PL127H/S29PL129H
S29PL127H_129H_00A1 May 7, 2004
Pr el i m i n ary
Write Pulse “Glitch” Protection
Noise pulses of less than 3 ns (typical) on OE#, CE#, or WE# do not initiate a
write cycle.
Logical Inhibit
Write cycles are inhibited by holding any one of OE# = VIL, CE# = VIH or WE# =
VIH. To initiate a write cycle, CE# and WE# must be a logical zero while OE# is a
logical one.
Power-Up Write Inhibit
commands on the rising edge of WE#. The internal state machine is automatically
reset to the read mode on power-up.
COMMON FLASH MEMORY INTERFACE (CFI)
The Common Flash Interface (CFI) specification outlines device and host system
software interrogation handshake, which allows specific vendor-specified soft-
ware algorithms to be used for entire families of devices. Software support can
then be device-independent, JEDEC ID-independent, and forward- and back-
ward-compatible for the specified flash device families. Flash vendors can
standardize their existing interfaces for long-term compatibility.
This device enters the CFI Query mode when the system writes the CFI Query
command, 98h, to address 55h, any time the device is ready to read array data.
The system can read CFI information at the addresses given in Tables
12–
15. To
terminate reading CFI data, the system must write the reset command. The CFI
Query mode is not accessible when the device is executing an Embedded Program
or embedded Erase algorithm.
The system can also write the CFI query command when the device is in the au-
toselect mode. The device enters the CFI query mode, and the system can read
CFI data at the addresses given in Tables
12–15. The system must write the reset
command to return the device to reading array data.
For further information, please refer to the CFI Specification and CFI Publication
100, at http://www.amd.com/flash/cfi. Contact your local sales office for copies
of these documents.
Table 12. CFI Query Identification String
Addresses
Data
Description
10h
11h
12h
0051h
0052h
0059h
Query Unique ASCII string “QRY”
13h
14h
0002h
0000h
Primary OEM Command Set
15h
16h
0040h
0000h
Address for Primary Extended Table
17h
18h
0000h
Alternate OEM Command Set (00h = none exists)
19h
1Ah
0000h
Address for Alternate OEM Extended Table (00h = none exists)