M58PR256J datasheet(40/114 Pages) STMICROELECTRONICS

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Program operations

M58PR256J, M58PR512J

40/114

Program operations

The M58PR256J and M58PR512J have innovative features specially developed to improve

the storage flexibility and efficiency of NOR Flash memory arrays.

Data and code can be stored more efficiently by using the right combination of program

methods and program modes.

There are two types of program methods, which use commands that consist of one or more

sequential Bus Write operations interpreted by the Command Interface:

●

Single Word Program method, which uses the Program command.

●

Buffered Program method, which uses either the Buffer Program command or the

Buffer Enhanced Factory Program command.

There are two program modes:

●

Control Program mode

●

Object Program mode.

The Control Program mode supports the two program methods, whereas the Object

Program mode only supports the Buffered Program method.

This new logical organization of program operations is made possible by the device

architecture, and in particular by the new concept of Program Regions.

5.1

Program Regions

Each Flash memory Block is divided into 256 Program Regions (see Figure 5: Program

Regions configured in Control or Object Program mode). Erase operations have a Block

granularity, whereas program operations have a Program Region granularity.

The user can configure each Program Region to be programmed either in the Control

Program mode or in the Object Program mode.

A given Block can contain Program Regions configured in the Control Program mode and

others configured in the Object Program mode.

Special care should be taken when selecting the programming mode for the Program

Regions because once the Program Regions are configured their program mode cannot be

changed until the entire Block is erased.

Each Program Region is split into 32 Segments of 32 Bytes and each Segment is

subdivided into two halves, ’A’ and ’B’. Address bit A3 determines whether a bit belongs to

the ’A’ half (A3 = 0) or to the ’B’ half (A3 = 1).

5.2

Program modes

There are two program modes, which allow the Flash memory to store different types of

data.

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