M58LT128GS datasheet(73/98 Pages) STMICROELECTRONICS

73 / 98 page

M58LT128GST, M58LT128GSB

13 Part Numbering

73/98

Appendix B Common Flash Interface

The Common Flash Interface is a JEDEC approved, 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 memory. The system can interface easily with the device, 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. Table 36, Table 37, Table 38, Table 39, Table 40,

Table 42, Table 43, Table 44 and Table 45 show the addresses used to retrieve the 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 also contains a security area where a 64 bit unique security number is

written (see

Figure 4: Protection Register 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 36.

Query Structure Overview

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 Table 37, Table 38, Table 39 and Table 40. Query data is always presented on the lowest order data

outputs.

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

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