M28W640HCT70N6E NUMONYX, M28W640HCT70N6E Datasheet - Page 53

• Manufacturer Part Number: M28W640HCT70N6E
• Description: TSOP-1 48 12X20 CUSTD FLASH
• Manufacturer: NUMONYX

M28W640HCT, M28W640HCB
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 (RCFI) is issued the device enters CFI Query mode and the
data structure is read from the memory. Tables 25, 26, 27, 28,
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
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 25.
1. Query data are always presented on the lowest order data outputs.
Offset
1Bh
00h
10h
27h
P
A
Reserved
CFI Query identification string
System interface information
Device geometry definition
Primary algorithm-specific extended query
table
Alternate algorithm-specific extended query
table
Common Flash interface (CFI)
Query structure overview
Table 30: Security code
Sub-section name
area). This area can be accessed only in Read mode
(1)
Reserved for algorithm-specific information
Command set ID and algorithm data offset
Device timing & voltage information
Flash device layout
Additional information specific to the primary
algorithm (optional)
Additional information specific to the
alternate algorithm (optional)
Common Flash interface (CFI)
29
Description
and
30
show the
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