m29f016d STMicroelectronics, m29f016d Datasheet - Page 27

• Manufacturer Part Number: m29f016d
• Description: 16 Mbit 2mb X8, Uniform Block 5v 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 is issued the de-
vice enters CFI Query mode and the data structure
Table 16. Query Structure Overview
Note: Query data are always presented on the lowest order data outputs.
Table 17. CFI Query Identification String
Address
Address
1Ah
10h
11h
12h
13h
14h
15h
16h
17h
18h
19h
1Bh
10h
27h
40h
61h
Data
51h
52h
59h
02h
00h
40h
00h
00h
00h
00h
00h
CFI Query Identification String
System Interface Information
Device Geometry Definition
Primary Algorithm-specific Extended Query
table
Security Code Area
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 19)
Alternate Vendor Command Set and Control Interface ID Code second vendor
- specified algorithm supported
Address for Alternate Algorithm extended Query table
Sub-section Name
Description
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.
Command set ID and algorithm data offset
Device timing & voltage information
Flash device layout
Additional information specific to the Primary
Algorithm (optional)
64 bit unique device number
Description
M29F016D
Compatible
P = 40h
Value
AMD
"Q"
"R"
"Y"
NA
NA
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