M28W640HCT datasheet(19/72 Pages) NUMONYX

19 / 72 page

M28W640HCT, M28W640HCB

Command interface

19/72

4.8

Quadruple Word Program command

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

adjacent words in parallel.The four words must differ only for the addresses A0 and A1.

Programming should not be attempted when VPP is not at VPPH.

Five bus write cycles are necessary to issue the Quadruple Word Program command:

●

The first bus cycle sets up the Quadruple 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

●

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

●

The fifth bus cycle latches the address and the data of the fourth 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 17: Quadruple Word Program flowchart and pseudocode, for the

flowchart for using the Quadruple Word Program command.

4.9

Clear Status Register command

The Clear Status Register command can be used to reset bits 1, 3, 4 and 5 in the Status

The bits in the Status Register do not automatically return to ‘0’ when a new Program or

Erase command is issued. The error bits in the Status Register should be cleared before

attempting a new Program or Erase command.

4.10

Program/Erase Suspend command

The Program/Erase Suspend command is used to pause a program or erase operation.

One bus write cycle is required to issue the Program/Erase command and pause the

Program/Erase controller.

During Program/Erase Suspend the command interface will accept the Program/Erase

Resume, Read Array, Read Status Register, Read Electronic Signature and Read CFI

Query commands. Additionally, if the suspend operation was Erase then the Program,

Double Word Program, Quadruple Word Program, Block Lock, Block Lock-down or

Protection Program commands will also be accepted. The block being erased may be

protected by issuing the Block Protect, Block Lock or Protection Program commands. When

the Program/Erase Resume command is issued the operation will complete. Only the blocks

not being erased may be read or programmed correctly.

During a Program/Erase Suspend, the device can be placed in a pseudo-standby mode by

taking Chip Enable to VIH. Program/Erase is aborted if Reset turns to VIL.

See Appendix C, Figure 18: Program Suspend & Resume flowchart and pseudocode, and

Figure 20: Erase Suspend & Resume flowchart and pseudocode, for flowcharts for using

the Program/Erase Suspend command.

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