M28W320FCT datasheet(18/69 Pages) STMICROELECTRONICS

18 / 69 page

Command interface

M28W320FCT, M28W320FCB

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4.5

Block Erase command

The Block Erase command can be used to erase a block. It sets all the bits within the

selected block to ’1’. All previous data in the block is lost. If the block is protected then the

Erase operation will abort, the data in the block will not be changed and the Status Register

will output the error.

Two Bus Write cycles are required to issue the command.

The first bus cycle sets up the Erase command.

The second latches the block address in the internal state machine and starts the

Program/Erase Controller.

If the second bus cycle is not Write Erase Confirm (D0h), Status Register bits b4 and b5 are

set and the command aborts.

Erase aborts if Reset turns to VIL. As data integrity cannot be guaranteed when the Erase

operation is aborted, the block must be erased again.

During Erase operations the memory will accept the Read Status Register command and

the Program/Erase Suspend command, all other commands will be ignored. Typical Erase

times are given in Table 8: Program, Erase Times and Program/Erase Endurance Cycles.

See Appendix C, Figure 20: Erase Flowchart and Pseudo Code, for a suggested flowchart

for using the Erase command.

4.6

Program command

The memory array can be programmed word-by-word. Two bus write cycles are required to

issue the Program Command.

The first bus cycle sets up the Program command.

The second latches the Address and the Data to be written and starts the

Program/Erase Controller.

During Program operations the memory will accept the Read Status Register command and

the Program/Erase Suspend command. Typical Program times are given in Table 8:

Program, Erase Times and Program/Erase Endurance Cycles.

Programming aborts if Reset goes to VIL. As data integrity cannot be guaranteed when the

program operation is aborted, the block containing the memory location must be erased and

reprogrammed.

See Appendix C, Figure 16: Program Flowchart and Pseudo Code, for the flowchart for

using the Program command.

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