M29W004B データシートの表示（PDF） - STMicroelectronics

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M29W004B

4 Mbit (512Kb x8, Boot Block) Low Voltage Single Supply Flash Memory

STMicroelectronics 

M29W004T, M29W004B

Table 9. Status Register Bits

DQ

Name

Logic Level

Definition

Note

7

Data

Polling

’1’

Erase Complete or erase

block in Erase Suspend

Indicates the P/E.C. status, check during

’0’

Erase On-going

Program or Erase, and on completion

before checking bits DQ5 for Program or

DQ

Program Complete or data

of non erase block during

Erase Success.

Erase Suspend

DQ

Program On-going

’-1-0-1-0-1-0-1-’ Erase or Program On-going

DQ

Program Complete

6 Toggle Bit

Erase Complete or Erase

’-1-1-1-1-1-1-1-’ Suspend on currently

addressed block

Successive reads output complementary

data on DQ6 while Programming or Erase

operations are on-going. DQ6 remains at

constant level when P/E.C. operations are

completed or Erase Suspend is

acknowledged.

5 Error Bit

4 Reserved

’1’

Program or Erase Error

This bit is set to ’1’ in the case of

Programming or Erase failure.

’0’

Program or Erase On-going

3

Erase

Time Bit

P/E.C. Erase operation has started. Only

’1’

Erase Timeout Period Expired possible command entry is Erase Suspend

(ES).

’0’

Erase Timeout Period

On-going

An additional block to be erased in parallel

can be entered to the P/E.C.

Chip Erase, Erase or Erase

Suspend on the currently

’-1-0-1-0-1-0-1-’

addressed block.

Erase Error due to the

currently addressed block

2 Toggle Bit

(when DQ5 = ’1’).

Indicates the erase status and allows to

identify the erased block

Program on-going, Erase

1

on-going on another block or

Erase Complete

DQ

Erase Suspend read on

non Erase Suspend block

1 Reserved

0 Reserved

Notes: Logic level ’1’ is High, ’0’ is Low. -0-1-0-0-0-1-1-1-0- represent bit value in successive Read operations.

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