M58BW16F datasheet(35/81 Pages) STMICROELECTRONICS

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M58BW16F, M58BW32F

Command interface

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4.9

Write to Buffer and Program command

The Write to Buffer and Program Command makes use of the device’s double Word (32 bit)

Write Buffer to speed up programming.

Up to eight Double Words can be loaded into the Write Buffer and programmed into the

memory.

Four successive steps are required to issue the command.

One Bus Write operation is required to set up the Write to Buffer and Program

Command. Any Bus Read operations will start to output the Status Register after the

1st cycle.

Use one Bus Write operation to write the selected memory Block Address (any address

in the block where the values will be programmed can be used) along with the value N

on the Data Inputs/Outputs, where N+1 is the number of Words to be programmed. The

maximum value of N+1 is 8 Words.

Use N+1 Bus Write operations to load the address and data for each Word into the

Write Buffer. The address must be between Start Address and Start Address plus N,

where Start Address is the first word address.

Finally, use one Bus Write operation to issue the final cycle to confirm the command

and start the Program operation.

If any address is outside the block boundaries or if the correct sequence is not followed,

Status Register bits 4 and 5 are set to ‘1’ and the operation will abort without affecting the

data in the memory array. A protected block must be unprotected using the Blocks Unprotect

command.

During a Write to Buffer and Program operation the memory will only accept the Read

Status Register and the Program/Erase Suspend commands. All other commands are

ignored. If PEN is at VIH, the operation will be performed. If PEN is lower than VIH the

operation aborts and the Status Register PEN bit (bit 3) is set to '1'.

The Status Register should be cleared before re-issuing the command.

M58BW16F Datasheet(PDF) 35 Page - STMicroelectronics