m29dw641f STMicroelectronics, m29dw641f Datasheet - Page 66

• Manufacturer Part Number: m29dw641f
• Description: 64 Mbit 4mb X16, Multiple Bank, Boot Block 3v Supply Flash Memory
• Manufacturer: STMicroelectronics

Common Flash Interface (CFI)
Appendix B
66/80
The Common Flash Interface is a JEDEC approved, 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 memory. The system can interface easily with the device, enabling the
software to upgrade itself when necessary.
When the Read CFI Query command is issued the addressed bank enters Read CFI Query
mode and Read Operations in the same bank (A21-A19) output the CFI data.
Table
retrieve the data.
The CFI data structure also contains a security area where a 64 bit unique security number
is written (see
mode by the final user. It is impossible to change the security number after it has been
written by ST.
Table 29.
1. Query data are always presented on the lowest order data outputs.
Table 30.
1. Query data are always presented on the lowest order data outputs (DQ7-DQ0) only. DQ8-DQ15 are ‘0’.
Address
Address
1Bh
10h
27h
40h
61h
1Ah
10h
11h
12h
13h
14h
15h
16h
17h
18h
19h
30,
Table
CFI Query Identification String
System Interface Information
Device Geometry Definition
Primary Algorithm-specific Extended
Query table
Security Code Area
Common Flash Interface (CFI)
Query structure overview
CFI Query Identification String
0051h
0052h
0059h
0002h
0000h
0040h
0000h
0000h
0000h
0000h
0000h
Table 34: Security Code
Data
31,
Table
Sub-section name
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
Alternate Vendor Command Set and Control Interface ID
Code second vendor - specified algorithm supported
Address for Alternate Algorithm extended Query table
32,
33)
Table 33
and
Area). This area can be accessed only in Read
Table 34
Description
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
show the addresses (A0-A10) used to
Description
Table
M29DW641F
Compatible
P = 40h
Value
AMD
“Q”
"R"
"Y"
NA
NA
29,