M29W400FB55N3F NUMONYX, M29W400FB55N3F Datasheet - Page 45

• Manufacturer Part Number: M29W400FB55N3F
• Description: IC FLASH 4MBIT 55NS 3V 48TSOP
• Manufacturer: NUMONYX
• Series: Axcell™r

Specifications of M29W400FB55N3F

• Format - Memory: FLASH
• Memory Type: FLASH - Nor
• Memory Size: 4M (512K x 8 or 256K x 16)
• Speed: 55ns
• Interface: Parallel
• Voltage - Supply: 2.7 V ~ 3.6 V
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 48-TSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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.
Table 29
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 24.
1. Query data are always presented on the lowest order data outputs.
x 16
1Bh
10h
27h
40h
61h
Address
show the addresses used to retrieve the data.
4Eh
C2h
20h
36h
80h
x 8
Common Flash interface (CFI)
Query structure overview
Table 29: Security code
CFI query identification string
System interface information
Device geometry definition
Primary algorithm-specific extended
query table
Security code area
Sub-section name
Table
area). This area can be accessed only in read mode
(1)
24,
Table
25,
Command set ID and algorithm data offset
Device timing & voltage information
Flash device layout
Additional information specific to the
primary algorithm (optional)
64-bit unique device number
Table
26,
Table
Description
27,
Table 28
and
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