M58BW016DB datasheet(55/69 Pages) STMICROELECTRONICS

55 / 69 page

M58BW016DT, M58BW016DB, M58BW016FT, M58BW016FB

Common Flash interface (CFI)

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Appendix A

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 25, Table 26, Table 27, Table 28 and Table 29

show the addresses used to retrieve the data.

Table 25.

Query structure overview

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)

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)

Table 26.

CFI - query address and data output(1)(2)

The x 8 or Byte Address and the x 16 or Word Address mode are not available.

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

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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