m29dw640f Numonyx, m29dw640f Datasheet - Page 60

• Manufacturer Part Number: m29dw640f
• Description: 64 Mbit 8mb X8 Or 4mb X16, Multiple Bank, Page, Boot Block 3v Supply Flash Memory
• Manufacturer: Numonyx

Common Flash Interface (CFI)
Appendix B
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 29
The CFI data structure also contains a security area where a 64 bit unique security number is written
(see
impossible to change the security number after it has been written by Numonyx.
Table 25.
1. Query data are always presented on the lowest order data outputs.
Table 26.
1. Query data are always presented on the lowest order data outputs (DQ7-DQ0) only. DQ8-DQ15 are ‘0’.
60/74
x16
10h
11h
12h
13h
14h
15h
16h
17h
18h
19h
1Ah
1Bh
x16
10h
27h
40h
61h
Table 30: Security Code Area
Address
Address
and
2Ch
2Ah
2Eh
20h
22h
24h
26h
28h
30h
32h
34h
Query structure overview
CFI Query Identification String
x8
Table 30
4Eh
C2h
20h
36h
80h
x8
0051h
0052h
0059h
0002h
0000h
0040h
0000h
0000h
0000h
0000h
0000h
Data
show the addresses (A-1, A0-A10) used to retrieve the data.
Common Flash Interface (CFI)
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
Alternate Vendor Command Set and Control Interface ID Code
second vendor - specified algorithm supported
Address for Alternate Algorithm extended Query table
). This area can be accessed only in Read mode by the final user. It is
Sub-section name
Description
Flash device layout
Additional information specific to the Primary
Algorithm (optional)
Command set ID and algorithm data offset
Device timing & voltage information
64 bit unique device number
Table 25
,
Table 26
Description
Table 29
,
Table 27
)
M29DW640F
,
Compatible
Table 28
P = 40h
Value
AMD
“Q”
"R"
"Y"
NA
NA
,