M28W640HCT datasheet(18/72 Pages) NUMONYX

18 / 72 page

Command interface

M28W640HCT, M28W640HCB

18/72

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 19: Erase flowchart and pseudocode, 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 15: Program flowchart and pseudocode, for the flowchart for using

the Program command.

4.7

Double Word Program command

This feature is offered to improve the programming throughput, writing a page of two

adjacent words in parallel.The two words must differ only for the address A0. Programming

should not be attempted when VPP is not at VPPH.

Three bus write cycles are necessary to issue the Double Word Program command:

●

The first bus cycle sets up the Double Word Program command

●

The second bus cycle latches the address and the data of the first word to be written

●

The third bus cycle latches the address and the data of the second word to be written

and starts the Program/Erase controller.

Read operations output the Status Register content after the programming has started.

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: Double Word Program flowchart and pseudocode for the

flowchart for using the Double Word Program command.

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