M29DW128F datasheet(76/93 Pages) STMICROELECTRONICS

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Appendix B Common Flash Interface (CFI)

The Common Flash Interface is a JEDEC approved, standardized data structure that can be

read from the Flash memory device. It allows a system software to query the device to

determine various electrical and timing parameters, density information and functions

supported by the memory. The system can interface easily with the device, enabling the

software to upgrade itself when necessary.

When the Read CFI Query command is issued the addressed bank enters Read CFI Query

mode and read operations in the same bank (A22-A19) output the CFI data. Table 35, Table 36,

Table 37, Table 38, Table 39 and Table 40 show the addresses (A-1, A0-A10) used to retrieve

the data.

The CFI data structure also contains a security area where a 64 bit unique security number is

written (see Table 40: Security Code Area). This area can be accessed only in Read mode by

the final user. It is impossible to change the security number after it has been written by ST.

Table 35.

Query Structure Overview

Query data are always presented on the lowest order data outputs.

Address

Sub-section Name

Description

x16

10h

20h

CFI Query Identification String

Command set ID and algorithm data offset

1Bh

36h

System Interface Information

Device timing & voltage information

27h

4Eh

Device Geometry Definition

Flash device layout

40h

80h

Primary Algorithm-specific Extended

Query table

Additional information specific to the Primary

Algorithm (optional)

61h

C2h

Security Code Area

64 bit unique device number

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