M29F080D90N6 View Datasheet(PDF) - STMicroelectronics
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M29F080D90N6 Datasheet PDF : 37 Pages
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M29F080D
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 16, 17, 18, 19, 20
and 21 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 21, 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.
Table 16. 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 17. CFI Query Identification String
Address Data
Description
Value
10h
51h
"Q"
11h
52h Query Unique ASCII String "QRY"
"R"
12h
59h
"Y"
13h
02h
Primary Algorithm Command Set and Control Interface ID code 16 bit ID code
AMD
14h
00h
defining a specific algorithm
Compatible
15h
40h
Address for Primary Algorithm extended Query table (see Table 19)
16h
00h
P = 40h
17h
18h
00h
Alternate Vendor Command Set and Control Interface ID Code second vendor
00h
- specified algorithm supported
NA
19h
00h
Address for Alternate Algorithm extended Query table
NA
1Ah
00h
27/37
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