M28W640FST datasheet(15/55 Pages) STMICROELECTRONICS

15 / 55 page

15/55

M28W320FST, M28W320FSB, M28W640FST, M28W640FSB

Read Array, Read Status Register, Read Electron-

ic Signature and Read CFI Query commands. Ad-

ditionally, if the suspend operation was Erase then

the Program, Double Word Program, Quadruple

Word Program, Block Lock, or Protection Program

commands will also be accepted. The block being

erased may be protected by issuing the Block Pro-

tect, Block Lock or Protection Program com-

mands.

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 Pseudo Code, and Fig-

ure 20., Erase Suspend & Resume Flowchart and

Pseudo Code, for flowcharts for using the Pro-

gram/Erase Suspend command.

Program/Erase Resume Command

The Program/Erase Resume command can be

used to restart the Program/Erase Controller after

a Program/Erase Suspend operation has paused

it. One Bus Write cycle is required to issue the

command. Once the command is issued subse-

quent Bus Read operations read the Status Reg-

ister.

See APPENDIX C., Figure 18., Program Suspend

& Resume Flowchart and Pseudo Code, and Fig-

ure 20., Erase Suspend & Resume Flowchart and

Pseudo Code, for flowcharts for using the Pro-

gram/Erase Resume command.

Protection Register Program Command

The Protection Register Program command is

used to Program the 128 bit user One-Time-Pro-

grammable (OTP) segment of the Protection Reg-

ister. The segment is programmed 16 bits at a

time. When shipped all bits in the segment are set

to ‘1’. The user can only program the bits to ‘0’.

Two write cycles are required to issue the Protec-

tion Register Program command.

■

The first bus cycle sets up the Protection

■

The second latches the Address and the Data

to be written to the Protection Register and

starts the Program/Erase Controller.

Read operations output the Status Register con-

tent after the programming has started.

The segment can be protected by programming bit

1 of the Protection Lock Register (see Figure

7., Protection Register Memory Map). Attempting

to program a previously protected Protection Reg-

ister will result in a Status Register error. The pro-

tection of the Protection Register is not reversible.

The Protection Register Program cannot be sus-

pended.

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