M58WR032FB datasheet(60/86 Pages) STMICROELECTRONICS

60 / 86 page

M58WR032FT, M58WR032FB

60/86

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, 33, 34, 35, 36, 37, 38 and 39 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 30. 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 31, 32, 33 and 34. Query data is always presented on the lowest order data outputs.

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

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