M29W017D View Datasheet(PDF) - STMicroelectronics
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M29W017D Datasheet PDF : 36 Pages
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M29W017D
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. Tables 17, 18, 19, 20, 21
and 22 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 22, 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/
Reset command to return to Read mode.
Table 17. Query Structure Overview
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
Note: Query data are always presented on the lowest order data outputs.
Table 18. CFI Query Identification String
Address Data
Description
10h
51h
11h
52h Query Unique ASCII String "QRY"
12h
59h
13h
02h
Primary Algorithm Command Set and Control Interface ID code 16 bit ID code
14h
00h
defining a specific algorithm
15h
40h
Address for Primary Algorithm extended Query table (see Table 20)
16h
00h
17h
00h
Alternate Vendor Command Set and Control Interface ID Code second vendor
18h
00h
- specified algorithm supported
19h
00h
Address for Alternate Algorithm extended Query table
1Ah
00h
Value
"Q"
"R"
"Y"
AMD
Compatible
P = 40h
NA
NA
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