M58BW016DB datasheet(46/63 Pages) STMICROELECTRONICS

46 / 63 page

M58BW016BT, M58BW016BB, M58BW016DT, M58BW016DB

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APPENDIX A. 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 25, 26,

27, 28 and 29 show the addresses used to retrieve

the data.

Table 25. 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.

Table 26. CFI - Query Address and Data Output

Note: 1. The x8 or Byte Address and the x16 or Word Address mode are not available.

2. Query Data are always presented on DQ7-DQ0. DQ31-DQ8 are set to '0'.

Offset

Sub-section Name

Description

00h

Manufacturer Code

01h

Device Code

10h

CFI Query Identification String

Command set ID and algorithm data offset

1Bh

System Interface Information

Device timing and voltage information

27h

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)

Address A0-A18

Data

Instruction

10h

51h

"Q"

51h; "Q"

Query ASCII String

52h; "R"

59h; "Y"

11h

52h

"R"

12h

59h

"Y"

13h

03h

Primary Vendor:

Command Set and Control Interface ID Code

14h

00h

15h

35h

Primary algorithm extended Query Address Table: P(h)

16h

00h

17h

00h

Alternate Vendor:

Command Set and Control Interface ID Code

18h

00h

19h

00h

Alternate Algorithm Extended Query address Table

1Ah

00h

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