A d v a n c e I n f o r m a t i o n
Power-Up Write Inhibit
If WE# = CE# = V and OE# = V during power up, the device does not accept commands on
IL
IH
the rising edge of WE#. The internal state machine is automatically reset to reading array data
on power-up.
Common Flash Memory Interface (CFI)
The Common Flash Interface (CFI) specification outlines device and host system software inter-
rogation handshake, which allows specific vendor-specified software algorithms to be used for
entire families of devices. Software support can then be device-independent, JEDEC ID-indepen-
dent, and forward- and backward-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 in word mode (or address AAh in byte mode), any time the device is ready to read
array data. The system can read CFI information at the addresses given in Tables 12–15. In word
mode, the upper address bits (A7–MSB) must be all zeros. To terminate reading CFI data, the
system must write the reset command.
The system can also write the CFI query command when the device is in the autoselect 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 the autoselect
mode.
For further information, please contact a Spansion representative for a copy of this document.
Table 12. CFI Query Identification String
Addresses
(Models03,04
Byte Mode
Addresses
Only)
Data
Description
10h
11h
12h
20h
22h
24h
0051h
0052h
0059h
Query Unique ASCII string QRY
13h
14h
26h
28h
0002h
0000h
Primary OEM Command Set
15h
16h
2Ah
2Ch
0040h
0000h
Address for Primary Extended Table
17h
18h
2Eh
30h
0000h
0000h
Alternate OEM Command Set (00h = none exists)
Address for Alternate OEM Extended Table (00h = none exists)
19h
1Ah
32h
34h
0000h
0000h
28
S29AL032D
S29AL032D_00_A3 June 13, 2005
SPANSION [ SPANSION ]
