S29CD032G datasheet(41/93 Pages) SPANSION

41 / 93 page

March 22, 2004 30606B0

S29CD032G

Ad va nc e

In forma t i o n

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 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 13–16. To terminate reading CFI data, the sys-

tem must write the reset command.

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 13–16. The system must write the reset

command to return the device to the autoselect mode.

For further information, please refer to the CFI Specification and CFI Publication

100, available via the World Wide Web at http://www.amd.com/products/nvd/

overview/cfi.html. Alternatively, contact an AMD representative for copies of

these documents.

Table 14. 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)

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