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| 型號： | M29W641DU90N6T |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 64 Mbit 4Mb x16, Uniform Block 3V Supply Flash Memory |
| 中文描述： | 64兆位4Mb的x16插槽，統(tǒng)一座3V電源快閃記憶體 |
| 文件頁數(shù)： | 32/42頁 |
| 文件大?。?/td> | 641K |
| 代理商： | M29W641DU90N6T |
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M29W641DH, M29W641DL, M29W641DU
32/42
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 is issued the de-
vice enters CFI Query mode and the data structure
is read from the memory. Table 18 to Table 23
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 writ-
ten (see Table 23, 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.
Table 18. Query Structure Overview
Note: Query data are always presented on the lowest order data outputs.
Table 19. CFI Query Identification String
Note:
Query data are always presented on the lowest order data outputs (DQ7-DQ0) only. DQ8-DQ15 are ‘0’.
Address
Sub-section Name
Description
10h
CFI Query Identification String
Command set ID and algorithm data offset
1Bh
System Interface Information
Device timing & voltage information
27h
Device Geometry Definition
Flash device layout
40h
Primary Algorithm-specific Extended
Query table
Additional information specific to the Primary
Algorithm (optional)
61h
Security Code Area
64 bit unique device number
Address
Data
Description
Value
10h
0051h
“Q”
11h
0052h
Query Unique ASCII String "QRY"
"R"
12h
0059h
"Y"
13h
0002h
Primary Algorithm Command Set and Control Interface ID code 16 bit
ID code defining a specific algorithm
AMD
Compatible
14h
0000h
15h
0040h
Address for Primary Algorithm extended Query table (see Table 22)
P = 40h
16h
0000h
17h
0000h
Alternate Vendor Command Set and Control Interface ID Code second
vendor - specified algorithm supported
NA
18h
0000h
19h
0000h
Address for Alternate Algorithm extended Query table
NA
1Ah
0000h
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