M28W640FCT datasheet(18/55 Pages) STMICROELECTRONICS

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M28W640FCT, M28W640FCB

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Table 9. Block Lock Status

Table 10. Protection Status

Note: 1. The lock status is defined by the write protect pin and by DQ1 (‘1’ for a locked-down block) and DQ0 (‘1’ for a locked block) as read

in the Read Electronic Signature command with A1 = VIH and A0 = VIL.

2. All blocks are locked at power-up, so the default configuration is 001 or 101 according to WP status.

3. A WP transition to VIH on a locked block will restore the previous DQ0 value, giving a 111 or 110.

Item

Address

Data

Block Lock Configuration

xx002

LOCK

Block is Unlocked

DQ0=0

Block is Locked

DQ0=1

Block is Locked-Down

DQ1=1

Current Protection Status(1)

(WP, DQ1, DQ0)

Next Protection Status(1)

(WP, DQ1, DQ0)

Current State

Program/Erase

Allowed

After Block

Lock Command

After Block

Unlock

Command

After Block Lock-

Down Command

After WP

transition

1,0,0

yes

1,0,1

1,0,0

1,1,1

0,0,0

1,0,1(2)

1,0,1

1,0,0

1,1,1

0,0,1

1,1,0

yes

1,1,1

1,1,0

1,1,1

0,1,1

1,1,1

1,1,0

1,1,1

0,1,1

0,0,0

yes

0,0,1

0,0,0

0,1,1

1,0,0

0,0,1(2)

0,0,1

0,0,0

0,1,1

1,0,1

0,1,1

1,1,1 or 1,1,0 (3)

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