M59DR032EA datasheet(39/43 Pages) STMICROELECTRONICS

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M59DR032EA, M59DR032EB

APPENDIX B. COMMON FLASH INTERFACE

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 Read CFI Query Command is issued

the device enters CFI Query mode and the data

structure is read from the memory. Tables 30, 31,

32 and 33 show the address used to retrieve each

data. The Query data is always presented on the

lowest order data outputs (DQ0-DQ7), the other

outputs (DQ8-DQ15) are set to 0.

The CFI data structure contains also a security

area starting at address 81h. This area can be ac-

cessed only in read mode and it is impossible to

change after it has been written by ST. Issue a

Read command to return to Read mode.

Table 30. Query Structure Overview

Table 31. CFI Query Identification String

Offset

Sub-section Name

Description

00h

Reserved

Reserved for algorithm-specific information

10h

CFI Query Identification String

Command set ID and algorithm data offset

1Bh

System Interface Information

Device timing & voltage information

27h

Device Geometry Definition

Flash device layout

Primary Algorithm-specific Extended Query table

Additional information specific to the Primary

Algorithm (optional)

Alternate Algorithm-specific Extended Query table

Additional information specific to the Alternate

Algorithm (optional)

Offset

Data

Description

00h

0020h

Manufacturer Code

01h

00A1h - bottom

00A0h - top

Device Code

02h-0Fh

reserved

Reserved

10h

0051h

Query Unique ASCII String "QRY"

11h

0052h

Query Unique ASCII String "QRY"

12h

0059h

Query Unique ASCII String "QRY"

13h

0002h

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

defining a specific algorithm

14h

0000h

15h

offset = P = 0040h

Address for Primary Algorithm extended Query table

16h

0000h

17h

0000h

Alternate Vendor Command Set and Control Interface ID Code second vendor

- specified algorithm supported (note: 0000h means none exists)

18h

0000h

19h

value = A = 0000h

Address for Alternate Algorithm extended Query table

note: 0000h means none exists

1Ah

0000h

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