M29W640FT datasheet(57/71 Pages) NUMONYX

Part #	M29W640FT

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

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Manufacturer	NUMONYX [Numonyx B.V]

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M29W640FT, M29W640FB

Common Flash Interface (CFI)

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

structure is read from the memory. Tables 23, 24, 25, 26, 27, and 28, 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 28: 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 23.

Query structure overview(1)

1.

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

Address

Sub-section name

Description

x16

x8

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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