AM29PDL128G80 datasheet(31/69 Pages) SPANSION

31 / 69 page

Am29PDL128G

July 29, 2002

P R E L I M I NARY

COMMON FLASH MEMORY INTERFACE

(CFI)

The Common Flash Interface (CFI) specification out-

lines device and host system software interrogation

handshake, which allows specific vendor-specified

software algorithms to be used for entire families of

devices. Software support can then be device-inde-

pendent, JEDEC ID-independent, 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 sys-

tem 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 10–13. To terminate reading CFI data,

the system must write the reset command. The CFI

Query mode is not accessible when the device is exe-

cuting an Embedded Program or embedded Erase al-

gorithm.

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 10–13. The

system must write the reset command to return the de-

vice to reading array data.

For further information, please refer to the CFI Specifi-

cation and CFI Publication 100, available via the

Wo rld Wide We b at ht tp :/ /www.am d.com/p rod-

ucts/nvd/overview/cfi.html. Alternatively, contact an

AMD representative for copies of these documents.

Table 10.

CFI Query Identification String

Addresses

(Double Word

Mode)

Addresses

(Word Mode)

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

Alternate OEM Command Set (00h = none exists)

19h

1Ah

32h

34h

0000h

Address for Alternate OEM Extended Table (00h = none exists)

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