M58BW16F datasheet(75/81 Pages) STMICROELECTRONICS

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M58BW16F, M58BW32F

Common Flash Interface (CFI)

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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 (RCFI) is issued the device enters CFI Query mode and the

data structure is read from the memory. Table 26, Table 27, Table 28, Table 31 and Table 30

show the addresses used to retrieve the data.

Table 26.

Query structure overview

Offset

Sub-section Name

Description

00h

0020h

Manufacturer Code ST

01h

883A

8839

8838

8837

Device Code

M58BW16FT (top)

M58BW16FB (bottom)

M58BW32FT (top)

M58BW32FB (bottm)

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)

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

Primary Algorithm-specific Extended Query

Table

Additional information specific to the

Primary Algorithm (optional)

A(h)(2)

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

Alternate Algorithm-specific Extended Query

Table

Additional information specific to the

Alternate Algorithm (optional)

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