M29F400 データシートの表示（PDF） - STMicroelectronics

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M29F400

4 Mbit (512Kb x8 or 256Kb x16, Boot Block) single supply Flash memory

STMicroelectronics 

Status Register

M29F400BT, M29F400BB

Table 6. Status Register bits(1)

Operation

Address

DQ7 DQ6 DQ5 DQ3 DQ2

RB

Program

Program During

Erase Suspend

Any Address

DQ7 Toggle 0

–

–

0

Any Address

DQ7 Toggle 0

–

–

0

Program Error

Any Address

DQ7 Toggle 1

–

–

0

Chip Erase

Any Address

0 Toggle 0

1

Toggle

0

Block Erase before

timeout

Erasing Block

Non-Erasing Block

0 Toggle 0

0 Toggle 0

0

Toggle

0

0 No Toggle 0

Block Erase

Erasing Block

Non-Erasing Block

0 Toggle 0

0 Toggle 0

1

Toggle

0

1 No Toggle 0

Erase Suspend

Erasing Block

1

No

Toggle

0

–

Toggle

1

Non-Erasing Block

Data read as normal

1

Erase Error

Good Block Address 0 Toggle 1

Faulty Block Address 0 Toggle 1

1 No Toggle 0

1

Toggle

0

1. Unspecified data bits should be ignored.

Figure 4. Data polling flowchart

START

READ DQ5 & DQ7

at VALID ADDRESS

DQ= 7 YES

DATA

NO

NO DQ5

=1

YES

READ DQ7

at VALID ADDRESS

DQ7

=

YES

DATA

NO

FAIL

PASS

AI03598

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