M29F080D datasheet(12/37 Pages) STMICROELECTRONICS

12 / 37 page

M29F080D

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During Erase Suspend it is possible to Read and

Program cells in blocks that are not being erased;

both Read and Program operations behave as

normal on these blocks. If any attempt is made to

program in a protected block or in the suspended

block then the Program command is ignored and

the data remains unchanged. The Status Register

is not read and no error condition is given. Read-

ing from blocks that are being erased will output

the Status Register.

It is also possible to issue the Auto Select, Read

CFI Query and Unlock Bypass commands during

an Erase Suspend. The Read/Reset command

must be issued to return the device to Read Array

mode before the Resume command will be ac-

cepted.

Erase Resume Command. The Erase Resume

command must be used to restart the Program/

Erase Controller after an Erase Suspend. The de-

vice must be in Read Array mode before the Re-

sume command will be accepted. An erase can be

suspended and resumed more than once.

Read CFI Query Command. The

Read

CFI

Query Command is used to read data from the

Common Flash Interface (CFI) Memory Area. This

command is valid when the device is in the Read

Array mode, or when the device is in Autoselected

mode.

One Bus Write cycle is required to issue the Read

CFI Query Command. Once the command is is-

sued subsequent Bus Read operations read from

the Common Flash Interface Memory Area.

The Read/Reset command must be issued to re-

turn the device to the previous mode (the Read Ar-

ray mode or Autoselected mode). A second Read/

Reset command would be needed if the device is

to be put in the Read Array mode from Autoselect-

ed mode.

See Appendix B, Tables 16, 17, 18, 19, 20 and 21

for details on the information contained in the

Common Flash Interface (CFI) memory area.

Block Protect and Chip Unprotect Com-

mands. Groups of blocks can be protected

against accidental Program or Erase. The Protec-

tion Groups are shown in Appendix A, Table 15.

The whole chip can be unprotected to allow the

data inside the blocks to be changed.

Block Protect and Chip Unprotect operations are

described in Appendix C.

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