M29F800DB55N6 NUMONYX, M29F800DB55N6 Datasheet - Page 42

• Manufacturer Part Number: M29F800DB55N6
• Description: IC FLASH 8MBIT 55NS 48TSOP
• Manufacturer: NUMONYX

Specifications of M29F800DB55N6

• Format - Memory: FLASH
• Memory Type: FLASH - Nor
• Memory Size: 8M (1M x 8 or 512K x 16)
• Speed: 55ns
• Interface: Parallel
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 48-TSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Common Flash Interface (CFI)
Appendix B
42/53
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 26
The CFI data structure also contains a security area where a 64 bit unique security number
is written (see
mode by the final user. It is impossible to change the security number after it has been
written by ST. Issue a Read command to return to Read mode.
Table 21.
1. Query data are always presented on the lowest order data outputs.
1Bh
x16
10h
27h
40h
61h
Address
show the addresses used to retrieve the data.
Common Flash Interface (CFI)
Query structure overview
Table 26: Security Code
4Eh
C2h
20h
36h
80h
x8
CFI Query Identification String Command set ID and algorithm data offset
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
(1)
21,
Table
22,
Device timing & voltage information
Flash device layout
Additional information specific to the
Primary Algorithm (optional)
64 bit unique device number
Table
23,
Table
Description
24,
Table
M29F800DT
25, and