m28w320bb STMicroelectronics, m28w320bb Datasheet - Page 33

• Manufacturer Part Number: m28w320bb
• Description: 32 Mbit 2mb X16, Boot Block 3v Supply Flash Memory
• Manufacturer: STMicroelectronics

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
Table 23. Query Structure Overview
Note: Query data are always presented on the lowest order data outputs.
Table 24. CFI Query Identification String
Note: Query data are always presented on the lowest order data outputs (DQ7-DQ0) only. DQ8-DQ15 are ‘0’.
02h-0Fh
Offset
Offset
1Ah
00h
01h
10h
12h
13h
14h
15h
16h
17h
18h
19h
1Bh
11h
00h
10h
27h
P
A
Reserved
CFI Query Identification String
System Interface Information
Device Geometry Definition
Primary Algorithm-specific Extended Query table
Alternate Algorithm-specific Extended Query table
offset = P =
value = A =
reserved
88BCh
88BDh
0020h
0051h
0052h
0059h
0003h
0000h
0035h
0000h
0000h
0000h
0000h
0000h
Data
Sub-section Name
Manufacturer Code
Device Code
Reserved
Query Unique ASCII String "QRY"
Query Unique ASCII String "QRY"
Query Unique ASCII String "QRY"
Primary Algorithm Command Set and Control Interface ID code 16 bit ID
code defining a specific algorithm
Address for Primary Algorithm extended Query table
Alternate Vendor Command Set and Control Interface ID Code second
vendor - specified algorithm supported (note: 0000h means none exists)
Address for Alternate Algorithm extended Query table
note: 0000h means none exists
Description
structure is read from the memory. Tables 23, 24,
25, 26, 27 and 28 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 28, 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.
Reserved for algorithm-specific information
Flash device layout
Additional information specific to the Primary
Algorithm (optional)
Additional information specific to the Alternate
Algorithm (optional)
Command set ID and algorithm data offset
Device timing & voltage information
M28W320BT, M28W320BB
Description
Compatible
Bottom
P=35h
Value
Intel
Top
“Q”
ST
“R”
“Y”
NA
NA
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