M58PR512LE datasheet(44/119 Pages) STMICROELECTRONICS

44 / 119 page

Program operations

M58PR256LE, M58PR512LE, M58PR001LE

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5.3.1

Single word program method

The single word program method is based on the Program command. It is only supported 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 generates an

error:

●

In the case of an erased program region, this is considered an illegal operation that

sets 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.

5.3.2

Buffer program method

The buffer program method is based on the Buffer Program command and uses a 1 Kbyte

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 regardless of 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 1 Kbyte 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 only be issued once in program regions configured in the

object program mode. Attempts to program the same program regions by re-issuing the

Buffer Program command leads to data corruption.

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

command.

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