M58PR256LE datasheet(27/119 Pages) STMICROELECTRONICS

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M58PR256LE, M58PR512LE, M58PR001LE

Command interface

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4.9

Buffer Enhanced Factory Program command

The Buffer Enhanced Factory Program command has been specially developed to speed up

programming in manufacturing environments where programming time is critical.

This command programs one or more write buffer(s) of 1 Kb to an aligned 1 Kb program

region. Once the device enters buffer enhanced factory program mode, the write buffer can

be reloaded any number of times as long as the address remains within the same main

array block. Only one block can be programmed at a time.

When programming a program region configured in control program mode with the Buffer

Enhanced Factory Program command, the ’B’ half segment addresses (A3 = 1) should not

contain ’0’ values. When writing to a program region configured in object program mode, the

B half may contain some ’0’ values.

If the number of bytes to program is less than 1 Kbyte, the remaining addresses must be

filled with FFFFh.

The use of the Buffer Enhanced Factory Program command requires the following operating

conditions:

●

VPP must be set to VPPH

●

VDD must be within operating range

●

Ambient temperature TA must be 30 °C ± 10 °C

●

The targeted block must be unlocked

●

The start address must be aligned with the start of a 1 Kb buffer boundary

●

The address must remain the start address throughout programming.

Dual operations are not supported during the Buffer Enhanced Factory Program operation,

and the command cannot be suspended.

The Buffer Enhanced Factory command programs one block at a time. All data to be

programmed must be contained in a single block. If the internal address counter is

incremented beyond the highest block address, addressing wraps around to the beginning

of the block.

The Buffer Enhanced Factory Program command consists of three phases: the setup

phase, the program and verify phase, and the exit phase (please refer to Table 9: Factory

Program command for detailed information).

4.9.1

Setup phase

The Buffer Enhanced Factory Program command requires two bus write cycles to initiate the

command.

●

The first bus write cycle sets up the Buffer Enhanced Factory Program command.

●

The second bus write cycle confirms the command.

After the confirm command is issued, read operations output the contents of the Status

to program.

The Status Register P/EC bit SR7 should be read to check that the P/EC is ready to

proceed to the next phase. If an error is detected, SR4 goes high (set to ‘1’) and the buffer

enhanced factory program operation is terminated. See Chapter 6: Status Register for

details on the error.

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