M29F032D データシートの表示（PDF） - STMicroelectronics

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M29F032D

32 Mbit (4Mb x8, Uniform Block) 5V Supply Flash Memory

STMicroelectronics 

M29F032D

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 17, 18, 19, 20, 21 and 22

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 16.

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.

Table 3. Commands

Bus Write Operations

Command

1st

2nd

3rd

4th

5th

6th

Addr Data Addr Data Addr Data Addr Data Addr Data Addr Data

Read/Reset

1 X F0

3 555 AA 2AA 55 X F0

Auto Select

3 555 AA 2AA 55 555 90

Program

4 555 AA 2AA 55 555 A0 PA PD

Unlock Bypass

3 555 AA 2AA 55 555 20

Unlock Bypass

Program

2 X A0 PA PD

Unlock Bypass Reset 2 X 90 X 00

Chip Erase

6 555 AA 2AA 55 555 80 555 AA 2AA 55 555 10

Block Erase

6+ 555 AA 2AA 55 555 80 555 AA 2AA 55 BA 30

Erase Suspend

1 X B0

Erase Resume

1 X 30

Read CFI Query

1 55 98

Note: X Don’t Care, PA Program Address, PD Program Data, BA Any address in the Block. All values in the table are in hexadecimal.

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