M58PR256LE datasheet(26/119 Pages) STMICROELECTRONICS

26 / 119 page

Command interface

M58PR256LE, M58PR512LE, M58PR001LE

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4.8

Buffer Program command

The Buffer Program command uses the device’s 1 Kbyte write buffer to speed up

programming. Up to 1 Kbyte can be loaded into the write buffer and programmed into the

specified 1 Kb aligned location in the main array. The Buffer Program command dramatically

reduces in-system programming time compared to the standard non-buffered program

command.

The Buffer Program command is supported in both object program mode and control

program mode.

When using the Buffer Program command in a region configured in object mode, the start

programming address must be aligned to the 1 Kb buffer.

When using the Buffer Program command in a region configured in control program mode,

the programmed address must be within the ’A’ segment halves of the program region

(addresses with A3 = 0) and the ’B’ segment halves of the program region (addresses with

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

Before issuing the Buffer Program Setup command, the Status Register bit SR7 at the bank

address should be read to ensure that the buffer is available (SR7=1).

Four successive steps are required to issue the Buffer Program command:

The first bus write cycle sets up the Buffer Program command. The setup code can be

addressed to any location within the targeted block.

The second bus write cycle sets up the number of words to be programmed. Value n is

written to the same block address, where n+1 is the number of words to be

programmed. The maximum buffer count is 1FF (512 words).

Use n+1 bus write cycles to load the address and data for each word into the write

buffer. Addresses must lie within the range from the start address to the start address +

n, where the start address is the location of the first data to be programmed. The start

address must be aligned to a 1 Kb boundary.

The final bus write cycle confirms the Buffer Program command and starts the program

operation.

All the addresses used in the buffer program operation must lie within the same block.

The buffer program operation does not change the read status of the banks until the Buffer

Program Confirm command is issued. The Buffer Program Confirm command changes the

read status of the bank to read Status Register, therefore, after the Buffer Program Confirm

command, read operations in the bank output the contents of the Status Register.

Invalid address combinations or failure to follow the correct sequence of bus write cycles

sets an error in the Status Register and aborts the operation without affecting the data in the

memory array.

If the block being programmed is protected, an error is set in the Status Register and the

operation aborts without affecting the data in the memory array.

During buffer program operations the bank being programmed only accepts the Read Array,

Read Status Register, Read Electronic Signature, Read CFI Query and the Program/Erase

Suspend commands; all other commands are ignored.

Refer to Chapter 11 for detailed information about simultaneous operations allowed in banks

not being programmed.

See Appendix C, Figure 21: Buffer program flowchart and pseudocode for a suggested

flowchart on using the Buffer Program command.

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