M29W160EB 데이터 시트보기 (PDF) - STMicroelectronics

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M29W160EB

16 Mbit (2Mb x8 or 1Mb x16, Boot Block) 3V Supply Flash Memory

STMicroelectronics 

M29W160ET, M29W160EB

APPENDIX B. COMMON FLASH INTERFACE (CFI)

The Common Flash Interface is a JEDEC ap-

proved, 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 mem-

ory. The system can interface easily with the de-

vice, enabling the software to upgrade itself when

necessary.

When the CFI Query Command is issued the de-

vice enters CFI Query mode and the data structure

is read from the memory. Tables 21, 22, 23, 24, 25

and 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 writ-

ten (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 num-

ber after it has been written by ST. Issue a Read

command to return to Read mode.

Note: The Common Flash Interface is only avail-

able for Temperature range 6 (–40 to 85°C).

Table 21. 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

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

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

Table 22. CFI Query Identification String

Address

x16

x8

Data

Description

Value

10h

20h

0051h

"Q"

11h

22h

0052h Query Unique ASCII String "QRY"

"R"

12h

24h

0059h

"Y"

13h

26h

0002h Primary Algorithm Command Set and Control Interface ID code 16 bit

AMD

14h

28h

0000h ID code defining a specific algorithm

Compatible

15h

2Ah

0040h

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

16h

2Ch

0000h

P = 40h

17h

18h

2Eh

0000h Alternate Vendor Command Set and Control Interface ID Code second

30h

0000h vendor - specified algorithm supported

NA

19h

32h

0000h Address for Alternate Algorithm extended Query table

NA

1Ah

34h

0000h

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

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