M58PR256J datasheet(43/114 Pages) STMICROELECTRONICS

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M58PR256J, M58PR512J

Program operations

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5.6

Single Word Program method

The Single Word Program method is based on the Program command. It is supported only

by Program Regions configured in the Control Program mode.

If the Single Word Program method is attempted in a Program Region configured in the

Object Program mode, the program operation is aborted and Status Register bits SR4 and

SR8 are set.

See Section 4: Command interface for a detailed description of the Program command.

In Program Regions configured in the Control Program mode, the Program command can

be issued several times.

Using the Single Word Program method to program one or more bits to '0' in the ’B’ halves of

the Segments (A3 = 1), of an erased or already programmed Program Region, will generate

an error:

●

in the case of an erased Program Region, it is considered an illegal operation that will

set Status Register bits SR4 and SR9.

●

in the case of an already programmed Program Region, an error is always generated

because:

–

to be able to write to a Program Region configured in the Object Program mode,

the entire Block that contains the Program Region must be erased first.

–

it is not allowed to write to the ’B’ halves of the Segments of a Program Region

configured in the Control Program mode.

5.7

Buffer Program method

The Buffer Program method is based on the Buffer Program command. It makes use of a

1KByte Write Buffer to speed up programming. The data is written to the Write Buffer and

then programmed to the specified main array location.

The Buffer Program method is supported whatever the program mode of the Program

Regions.

When using the Buffer Program method in a Program Region configured in the Object

Program mode, the start address must be aligned to the 1KB Write Buffer.

When using the Buffer Program method in a Program Region configured in the Control

Program mode, the address to be programmed must be located inside the ’A’ halves of the

Program Region’s Segments (addresses with A3 = 0) and the ’B’ halves of the Segments

(addresses with A3= 1) must be filled only with FFFFh data.

The Buffer Program command can be issued several times to Program Regions configured

in the Control Program mode.

The Buffer Program command can be issued only once in Program Regions configured in

the Object Program mode. Attempts to program the same Program Regions by re-issuing

the Buffer Program command will lead to data corruption.

See Section 4: Command interface for a detailed description of the Buffer Program

command.

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