M29F800DB70N6E View Datasheet(PDF) - STMicroelectronics

Part Name

Description

MFG CO.

M29F800DB70N6E

8 Mbit (1Mb x8 or 512Kb x16, Boot Block) 5V Supply Flash Memory

STMicroelectronics 

Common Flash Interface (CFI)

Appendix B Common Flash Interface (CFI)

M29F800DT

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. Table 21, Table 22, Table 23, Table 24, Table 25, and

Table 26 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 26: 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. Issue a Read command to return to Read mode.

Table 21. Query structure overview(1)

Address

x16

x8

Sub-section name

Description

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

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

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