M36W432BG ST Microelectronics, M36W432BG Datasheet - Page 50

• Manufacturer Part Number: M36W432BG
• Description: 32 Mbit 2Mb x16 / Boot Block Flash Memory and 4 Mbit 256Kb x16 SRAM / Multiple Memory Product
• Manufacturer: ST Microelectronics

M36W432TG, M36W432BG
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 28. Query Structure Overview
Note: Query data are always presented on the lowest order data outputs.
Table 29. CFI Query Identification String
Note: Query data are always presented on the lowest order data outputs (DQ7-DQ0) only. DQ8-DQ15 are ‘0’.
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02h-0Fh
Offset
Offset
1Bh
1Ah
00h
10h
27h
00h
01h
10h
11h
12h
13h
14h
15h
16h
17h
18h
19h
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
reserved
88BAh
88BBh
0020h
0051h
0052h
0059h
0003h
0000h
0035h
0000h
0000h
0000h
0000h
0000h
Data
Manufacturer Code
Device Code
Reserved
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 (see Table 31)
Alternate Vendor Command Set and Control Interface ID Code second vendor -
specified algorithm supported (0000h means none exists)
Address for Alternate Algorithm extended Query table
(0000h means none exists)
Sub-section Name
Description
structure is read from the memory. Tables 28, 29,
30, 31, 32 and 33 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 33, 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
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)
Description
compatible
P = 35h
Bottom
Value
Intel
Top
"Q"
"R"
"Y"
NA
NA
ST