M58WT032KB datasheet(89/117 Pages) NUMONYX

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M58WTxxxKT, M58WTxxxKB

Common Flash interface

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Appendix B

Common Flash interface

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 Read CFI Query Command is issued the device enters CFI query mode and the

data structure is read from the memory. Tables 34, 35, 36, 37, 38, 39, 40, 41, 42 and 43

show the addresses used to retrieve the data. The query data is always presented on the

lowest order data outputs (DQ0-DQ7), the other outputs (DQ8-DQ15) are set to 0.

The CFI data structure also contains a security area where a 64-bit unique security number

is written (see Figure 5: Protection Register memory map). 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 Array command to return to read mode.

Table 34.

Query structure overview(1)

The Flash memory display the CFI data structure when CFI Query command is issued. In this table are

listed the main sub-sections detailed in Tables 35, 36, 37 and 38. Query data is always presented on the

lowest order data outputs.

Offset

Sub-section name

Description

00h

Reserved

Reserved for algorithm-specific information

10h

CFI Query Identification String

Command set ID and algorithm data offset

1Bh

System Interface Information

Device timing and voltage information

27h

Device Geometry Definition

Flash device layout

Primary Algorithm-specific Extended Query

table

Additional information specific to the

primary algorithm (optional)

Alternate Algorithm-specific Extended

Query table

Additional information specific to the

Alternate Algorithm (optional)

80h

Security Code Area

Lock Protection Register

Unique device Number and

User Programmable OTP

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