M28W320 데이터 시트보기 (PDF) - STMicroelectronics

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M28W320

32 Mbit (2Mb x16, Boot Block) 3V Supply Flash Memory

STMicroelectronics 

M28W320FCT, M28W320FCB

Common Flash Interface (CFI)

Appendix B Common Flash Interface (CFI)

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 CFI Query Command (RCFI) is issued the device enters CFI Query mode and the

data structure is read from the memory. Table 26, Table 27, Table 28, Table 29, Table 30 and

Table 31 show the addresses used to retrieve the data.

The CFI data structure also contains a security area where a 64 bit unique security number

is written (see Table 31: Security Code Area). 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 command to return to Read mode.

Table 26. Query Structure Overview(1)

Offset

Sub-section Name

Description

00h Reserved

10h CFI Query Identification String

1Bh System Interface Information

27h Device Geometry Definition

Reserved for algorithm-specific information

Command set ID and algorithm data offset

Device timing & voltage information

Flash device layout

P Primary Algorithm-specific Extended Query table

A Alternate Algorithm-specific Extended Query table

Additional information specific to the Primary

Algorithm (optional)

Additional information specific to the Alternate

Algorithm (optional)

1. Query data are always presented on the lowest order data outputs.

Table 27. CFI Query Identification String(1)

Offset Data

Description

Value

00h 0020h Manufacturer Code

88BAh

01h

Device Code

88BBh

02h-0Fh reserved Reserved

10h 0051h

11h 0052h Query Unique ASCII String "QRY"

12h 0059h

13h 0003h Primary Algorithm Command Set and Control Interface ID code 16 bit

14h 0000h ID code defining a specific algorithm

15h 0035h

Address for Primary Algorithm extended Query table (see Table 29)

16h 0000h

ST

Top

Bottom

"Q"

"R"

"Y"

Intel compatible

P = 35h

51/69

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