32Mb, 64Mb, 128Mb: 3V Embedded Parallel NOR Flash
Common Flash Interface
Common Flash Interface
The common Flash interface (CFI) is a JEDEC-approved, standardized data structure
that can be read from the Flash memory device. It allows a system's 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 de-
vice, enabling the software to upgrade itself when necessary.
When the READ CFI QUERY command is issued, the device enters CFI query mode and
the data structure is read from memory. The following tables show the addresses (A-1,
A[7:0]) used to retrieve the data. The query data is always presented on the lowest order
data outputs (DQ[7:0]), and the other data outputs (DQ[15:8]) are set to 0.
Table 23: Query Structure Overview
Note 1 applies to the entire table
Address
x16
10h
1Bh
27h
40h
x8
Subsection Name
Description
20h
36h
4Eh
80h
CFI query identification string
System interface information
Device geometry definition
Command set ID and algorithm data offset
Device timing and voltage information
Flash device layout
Primary algorithm-specific extended query table Additional information specific to the primary al-
gorithm (optional)
1. Query data are always presented on the lowest order data outputs (DQ[7:0]). DQ[15:8]
are set to 0.
Note:
Table 24: CFI Query Identification String
Note 1 applies to the entire table
Address
x16
10h
11h
12h
x8
Data Description
Value
"Q"
"R"
"Y"
–
20h
22h
24h
0051h Query unique ASCII string "QRY"
0052h
0059h
13h
14h
26h
28h
0002h Primary algorithm command set and control interface ID code 16-bit ID
0000h code defining a specific algorithm
15h
16h
2Ah
2Ch
0040h Address for primary algorithm extended query table (see the Primary Algo-
0000h rithm-Specific Extended Query Table)
P = 40h
17h
18h
2Eh
30h
0000h Alternate vendor command set and control Interface ID code second ven-
0000h dor-specified algorithm supported
–
–
19h
1Ah
32h
34h
0000h Address for alternate algorithm extended query table
0000h
1. Query data are always presented on the lowest order data outputs (DQ[7:0]). DQ[15:8]
are set to 0.
Note:
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