M29W640FT70N6E View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

M29W640FT70N6E

64 Mbit (8Mb x8 or 4Mb x16, Page, Boot Block) 3V Supply Flash Memory

STMicroelectronics 

M29W640FT, M29W640FB

Appendix B Common Flash Interface (CFI)

9 Part Numbering

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 CFI Query Command is issued the device enters CFI Query mode and the data

structure is read from the memory. Tables 22, 23, 24, 25, 26, and 27, show the addresses 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 27: 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 22. Query Structure Overview

Address

x16

x8

Sub-section Name

10h

20h CFI Query Identification String

1Bh

36h System Interface Information

27h

4Eh Device Geometry Definition

40h

80h

Primary Algorithm-specific Extended

Query table

61h

C2h Security Code Area

Description

Command set ID and algorithm data offset

Device timing & voltage information

Flash device layout

Additional information specific to the Primary

Algorithm (optional)

64 bit unique device number

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

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