M29DW128F datasheet(31/93 Pages) STMICROELECTRONICS

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M29DW128F

6 Command Interface

31/93

One of the Erase Commands must be used to set all the bits in a block or in the whole memory

from ’0’ to ’1’.

6.1.11 Verify command

The Verify command is used to check if a block is blank or in other words, if it has been

successfully erased and all its bits set to ’1’. It reads the value of the Error Bit DQ5. If the Error

Bit is set to ’1’, it indicates that the operation failed.

Three cycles are required to issue a Verify command:

The command starts with two unlock cycles.

The third Bus Write cycle sets up the Verify command code along with the address of the

block to be checked.

Table 11.

Standard Commands, 8-bit Mode

Command

Bus Operations(1)(2)

Grey cells represent Read cycles. The other cells are Write cycles.

X Don’t Care, PA Program Address, PD Program Data, BA Any address in the Block, BKA Bank Address. All values in the

table are in hexadecimal.

1st

2nd

3rd

4th

5th

6th

Add

Data Add

Dat

Add

Data Add Data Add Data Add Data

Read/Reset

AAA

555

Auto

Select

Manufacturer Code

AAA

555

(BKA)

AAA

(3)

The Auto Select addresses and data are given in Table 4: Read Electronic Signature, 8-bit Mode, and Table 5: Block

Protection, 8-bit Mode, except for A9 that is ‘Don’t Care’.

(3)

Device Code

Extended Block Protection

Indicator

Block Protection Status

Program

AAA

555

AAA

Verify

AAA

555

Chip Erase

AAA

555

AAA

555

AAA

Block Erase

AAA

555

AAA

555

Erase/Program Suspend

BKA

Erase/Program Resume

BKA

Read CFI Query

(BKA)

AAA

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