AM29F160D datasheet(16/46 Pages) AMD

16 / 46 page

Am29F160D

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-indepen-

dent, 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 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 5–8. 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 5–8. The

system must write the reset command to return the

device to the autoselect mode.

For further information, please refer to the CFI Specifi-

cation and CFI Publication 100, available via the World

Wide Web at http://www.amd.com/products/nvd/over-

view/cfi.html. Alternatively, contact an AMD represen-

tative for copies of these documents.

Table 5.

CFI Query Identification String

Addresses

(Word Mode)

Addresses

(Byte 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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