M58LW64D datasheet(35/50 Pages) STMICROELECTRONICS

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M58LW064D

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 (RCFI) is issued

the device enters CFI Query mode and the data

structure is read from the memory. Tables 24, 25,

26, 27, 28 and 29 show the addresses used to re-

trieve the data.

Table 24. Query Structure Overview

Note: 1. Offset 15h defines P which points to the Primary Algorithm Extended Query Address Table.

2. Offset 19h defines A which points to the Alternate Algorithm Extended Query Address Table.

3. SBA is the Start Base Address for each block.

4. In x8 mode, A0 must be set to VIL, otherwise 00h will be output.

Table 25. CFI - Query Address and Data Output

Note: 1. Query Data are always presented on DQ7-DQ0. DQ15-DQ8 are set to '0'.

2. Offset 19h defines A which points to the Alternate Algorithm Extended Query Address Table.

3. In x8 mode, A0 must be set to VIL, otherwise 00h will be output.

Address

Sub-section Name

Description

x16

x8(4)

0000h

00h

Manufacturer Code

0001h

02h

Device Code

0010h

20h

CFI Query Identification String

Command set ID and algorithm data offset

001Bh

36h

System Interface Information

Device timing and voltage information

0027h

4Eh

Device Geometry Definition

Flash memory layout

P(h)(1)

Primary Algorithm-specific Extended

Query Table

Additional information specific to the Primary

Algorithm (optional)

A(h)(2)

Alternate Algorithm-specific Extended

Query Table

Additional information specific to the Alternate

Algorithm (optional)

(SBA+02)h

Block Status Register

Block-related Information

Address

Data

Description

x16

x8(3)

0010h

20h

51h

"Q"

51h; "Q"

Query ASCII String 52h; "R"

59h; "Y"

0011h

22h

52h

"R"

0012h

24h

59h

"Y"

0013h

26h

01h

Primary Vendor:

Command Set and Control Interface ID Code

0014h

28h

00h

0015h

2Ah

31h

Primary algorithm extended Query Address Table: P(h)

0016h

2Ch

00h

0017h

2Eh

00h

Alternate Vendor:

Command Set and Control Interface ID Code

0018h

30h

00h

0019h

32h

00h

Alternate Algorithm Extended Query address Table

001Ah(2)

34h

00h

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