M29W320DB90N6E(2008) View Datasheet(PDF) - Numonyx -> Micron

Part Name

Description

Manufacturer

M29W320DB90N6E
(Rev.:2008)

32 Mbit (4Mbx8 or 2Mbx16, Non-uniform Parameter Blocks, Boot Block), 3V Supply Flash memory

Numonyx -> Micron 

Common Flash Interface (CFI)

M29W320DT, M29W320DB

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. 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 Numonyx. 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.

Table 22. CFI Query Identification String(1)

Address

x16 x8

Data

Description

Value

10h 20h 0051h

“Q”

11h 22h 0052h Query Unique ASCII String "QRY"

"R"

12h 24h 0059h

"Y"

13h

14h

26h

28h

0002h

0000h

Primary Algorithm Command Set and Control Interface ID code 16 bit

ID code defining a specific algorithm

AMD Compatible

15h 2Ah 0040h

Address for Primary Algorithm extended Query table (see Table 24)

16h 2Ch 0000h

P = 40h

17h 2Eh 0000h Alternate Vendor Command Set and Control Interface ID Code

18h 30h 0000h second vendor - specified algorithm supported

NA

19h 32h 0000h

Address for Alternate Algorithm extended Query table

NA

1Ah 34h 0000h

1. Query data are always presented on the lowest order data outputs (DQ7-DQ0) only. DQ8-DQ15 are ‘0’.

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