M29W640GT70NA6F NUMONYX, M29W640GT70NA6F Datasheet - Page 75

• Manufacturer Part Number: M29W640GT70NA6F
• Description: 64MB FLASH MEMORY
• Manufacturer: NUMONYX

M29W640GH, M29W640GL, M29W640GT, M29W640GB
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 CFI Query command is issued the device enters CFI query mode and the data
structure is read from the memory. Tables 30, 31, 32, 33, 34, and 35, 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 written (see
accessed only in read mode by the final user. It is impossible to change the security number
after it has been written by Numonyx.
Table 30.
1. Query data are always presented on the lowest order data outputs.
Table 31.
1. Query data are always presented on the lowest order data outputs (DQ7-DQ0) only. DQ8-DQ15 are ‘0’.
1Ah
x16
10h
11h
12h
13h
14h
15h
16h
17h
18h
19h
1Bh
x16
10h
27h
40h
61h
Address
Address
2Ah
2Ch 0000h
2Eh
20h
22h
24h
26h
28h
30h
32h
34h
x8
C2h
36h
4Eh
20h
80h
x8
Common flash interface (CFI)
Query structure overview
CFI query identification string
0051h
0052h Query unique ASCII string ‘QRY’
0059h
0002h Primary algorithm command set and control interface ID code
0000h
0040h Address for primary algorithm extended query table (see
0000h Alternate vendor command set and control interface ID code
0000h
0000h
0000h
Data
CFI Query Identification String
System Interface Information
Device geometry definition
Primary algorithm-specific extended
query table
Security code area
16-bit ID code defining a specific algorithm
Table
second vendor - specified algorithm supported
Address for alternate algorithm extended query table
Sub-section name
34)
(1)
Table 35: Security code
Description
(1)
Flash device layout
Command set ID and algorithm data offset
Device timing & voltage information
Additional information specific to the
primary algorithm (optional)
64-bit unique device number
Common flash interface (CFI)
area). This area can be
Description
compatible
P = 40h
Value
AMD
NA
NA
‘Q’
‘R’
‘Y’
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