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M58MR016C, M58MR016D

COMMON FLASH INTERFACE (CFI)

The Common Flash Interface (CFI) specification is

a JEDEC approved, standardized data structure

that can be read from the Flash memory device.

CFI allows a system software to query the flash

device to determine various electrical and timing

parameters, density information and functions

supported by the device. CFI allows the system to

easily interface to the Flash memory, to learn

about its features and parameters, enabling the

software to configure itself when necessary.

Tables 17, 18, 19, 20, 21, 22 and 23 show the ad-

dress used to retrieve each data. The CFI data

structure gives information on the device, such as

the sectorization, the command set and some

electrical specifications. The CFI data structure

contains also a security area; in this section, a 64

bit unique security number is written, starting at

address 81h. This area can be accessed only in

read mode and there are no ways of changing the

code after it has been written by ST. Write a read

instruction to return to Read mode (see Table 11).

Refer to the CFI Query instruction to understand

how the M58MR016 enters the CFI Query mode.

Table 17. 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 18, 19, 20, 21, 22 and 23. Query data are always presented on the lowest order data outputs.

Table 18. CFI Query Identification String

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

1. DRC means Die Revision Code.

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

P

Primary Algorithm-specific Extended Query table

Additional information specific to the Primary

Algorithm (optional)

A

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

ST

01h

88DEh

88E0h

Device Code

Top

Bottom

02h

reserved

Reserved

03h

Die Revision Code

04h-0Fh

reserved

Reserved

10h

0051h

Query Unique ASCII String "QRY"

"Q"

11h

0052h

"R"

12h

0059h

"Y"

13h

0002h

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 20)

p = 39h

16h

0000h

17h

0000h

Alternate Vendor Command Set and Control Interface ID Code

second vendor - specified algorithm supported ( 0000h means none

exists)

NA

18h

0000h

19h

value = A = 0000h

Address for Alternate Algorithm extended Query table

(0000h means none exists)

NA

1Ah

0000h