M28W160BB100ZB1T View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

M28W160BB100ZB1T

16 Mbit (1Mb x16, Boot Block) 3V Supply Flash Memory

STMicroelectronics 

M28W160BT, M28W160BB

APPENDIX B. COMMON FLASH INTERFACE (CFI)

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 CFI Query Command (RCFI) is issued

the device enters CFI Query mode and the data

structure is read from the memory. Tables 24, 25,

26, 27, 28 and 29 show the addresses used to re-

trieve the data.

The CFI data structure also contains a security

area where a 64 bit unique security number is writ-

ten (see Table 29, 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 24. Query Structure Overview

Offset

Sub-section Name

00h Reserved

10h CFI Query Identification String

1Bh System Interface Information

27h Device Geometry Definition

P

Primary Algorithm-specific Extended Query table

A

Alternate Algorithm-specific Extended Query table

Note: Query data are always presented on the lowest order data outputs.

Description

Reserved for algorithm-specific information

Command set ID and algorithm data offset

Device timing & voltage information

Flash device layout

Additional information specific to the Primary

Algorithm (optional)

Additional information specific to the Alternate

Algorithm (optional)

Table 25. CFI Query Identification String

Offset

Data

Description

Value

00h

0020h

Manufacturer Code

ST

01h

0090h

0091h

Device Code

Top

Bottom

02h-0Fh

reserved

Reserved

10h

0051h

Query Unique ASCII String "QRY"

“Q”

11h

0052h

Query Unique ASCII String "QRY"

“R”

12h

0059h

Query Unique ASCII String "QRY"

“Y”

13h

0003h

Primary Algorithm Command Set and Control Interface ID code 16 bit ID

Intel

14h

0000h

code defining a specific algorithm

Compatible

15h

offset = P =

0035h

Address for Primary Algorithm extended Query table

16h

0000h

P=35h

17h

18h

0000h

0000h

Alternate Vendor Command Set and Control Interface ID Code second

vendor - specified algorithm supported (note: 0000h means none exists)

NA

19h

value = A =

0000h

Address for Alternate Algorithm extended Query table

note: 0000h means none exists

NA

1Ah

0000h

Note: Query data are always presented on the lowest order data outputs (DQ7-DQ0) only. DQ8-DQ15 are ‘0’.

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