M58LR128FT datasheet(60/82 Pages) STMICROELECTRONICS

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M58LR128FT, M58LR128FB

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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 31, 32,

33, 34, 35, 36, 37, 38, 39 and 40 show the ad-

dresses used to retrieve the data. The Query data

is always presented on the lowest order data out-

puts (DQ0-DQ7), the other outputs (DQ8-DQ15)

are set to 0.

The CFI data structure also contains a security

area where a 64 bit unique security number is writ-

ten (see Figure 5., Protection Register Memory

Map). This area can be accessed only in Read

mode by the final user. It is impossible to change

the security number after it has been written by

ST. Issue a Read Array command to return to

Read mode.

Table 31. 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 32, 33, 34, and 35. Query data is always presented on the lowest order data outputs.

Table 32. CFI Query Identification String

Offset

Sub-section Name

Description

000h

Reserved

Reserved for algorithm-specific information

010h

CFI Query Identification String

Command set ID and algorithm data offset

01Bh

System Interface Information

Device timing & voltage information

027h

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)

080h

Security Code Area

Lock Protection Register

Unique device Number and

User Programmable OTP

Offset

Sub-section Name

Description

Value

000h

0020h

Manufacturer Code

001h

88C4h

88C5h

Device Code

Top

Bottom

002h

Reserved

003h

Reserved

004h-00Fh

Reserved

010h

0051h

Query Unique ASCII String "QRY"

"Q"

011h

0052h

"R"

012h

0059h

"Y"

013h

0003h

Primary Algorithm Command Set and Control Interface ID code 16

bit ID code defining a specific algorithm

014h

0000h

015h

offset = P = 000Ah

Address for Primary Algorithm extended Query table (see Table

34.)

p = 10Ah

016h

0001h

017h

0000h

Alternate Vendor Command Set and Control Interface ID Code

second vendor - specified algorithm supported

018h

0000h

019h

value = A = 0000h

Address for Alternate Algorithm extended Query table

01Ah

0000h

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