7782 datasheet(48/63 Pages) STMICROELECTRONICS

48 / 63 page

M58CR032C, M58CR032D

48/63

APPENDIX A. 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 29, 30,

31, 32, 33, 34 and 35 show the addresses used to

retrieve the data.

The CFI data structure also contains a security

area where a 64 bit unique security number is writ-

ten (see Table 35, Security Code area). This area

can be accessed only in Read mode by the final

user. It is impossible to change the security num-

ber after it has been written by ST. Issue a Read

command to return to Read mode.

Table 29. Query Structure Overview

Note: The Flash memory display the CFI data structure when CFI Query command is issued. In this table are listed the main sub-sections

detailed in Tables 30, 31, 32, 33, 34 and 35. Query data are always presented on the lowest order data outputs.

Table 30. CFI Query Identification String

Note: Query data are always presented on the lowest - order data outputs (ADQ0-ADQ7) only. ADQ8-ADQ15 are ‘0’.

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)

80h

Security Code Area

Lock Protection Register

Unique device Number and

User Programmable OTP

Offset

Sub-section Name

Description

Value

00h

0020h

Manufacturer Code

01h

88C8h

88C9h

Device Code (M58CR032C/D)

Top

Bottom

02h

reserved

Reserved

03h

reserved

Reserved

04h-0Fh

reserved

Reserved

10h

0051h

Query Unique ASCII String "QRY"

"Q"

11h

0052h

"R"

12h

0059h

"Y"

13h

0003h

Primary Algorithm Command Set and Control Interface ID code 16

bit ID code defining a specific algorithm

14h

0000h

15h

offset = P = 0039h

Address for Primary Algorithm extended Query table (see Table 32)

p = 39h

16h

0000h

17h

0000h

Alternate Vendor Command Set and Control Interface ID Code

second vendor - specified algorithm supported

18h

0000h

19h

value = A = 0000h

Address for Alternate Algorithm extended Query table

1Ah

0000h

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