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參數(shù)資料
| 型號： | M29W800FB9N3F |
| 廠商： | NUMONYX |
| 元件分類： | PROM |
| 英文描述： | 512K X 16 FLASH 3V PROM, 90 ns, PDSO48 |
| 封裝： | 12 X 20 MM, ROHS COMPLIANT, PLASTIC, TSOP-48 |
| 文件頁數(shù)： | 32/49頁 |
| 文件大?。?/td> | 936K |
| 代理商： | M29W800FB9N3F |
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Common Flash interface (CFI)
M29W800FT, M29W800FB
Appendix B
Common Flash interface (CFI)
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
Table 26 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 Table 26: Security code area). This area can be accessed only in read mode
by the final user. It is impossible to change the security number after it has been written by
Numonyx. Issue a Read command to return to read mode.
Table 21.
Query structure overview (1)
1.
Query data are always presented on the lowest order data outputs.
Address
Sub-section name
Description
x 16
x 8
10h
20h
CFI query identification string
Command set ID and algorithm data offset
1Bh
36h
System interface information
Device timing & voltage information
27h
4Eh
Device geometry definition
Flash device layout
40h
80h
Primary algorithm-specific extended
query table
Additional information specific to the
primary algorithm (optional)
61h
C2h
Security code area
64-bit unique device number
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