M28W320ECT70N1F データシートの表示（PDF） - STMicroelectronics

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M28W320ECT70N1F

32 Mbit (2Mb x16, Boot Block) 3V Supply Flash Memory

STMicroelectronics 

M28W320ECT, M28W320ECB

Table 9. Block Lock Status

Item

Block Lock Configuration

Block is Unlocked

Block is Locked

Block is Locked-Down

Address

xx002

Data

LOCK

DQ0=0

DQ0=1

DQ1=1

Table 10. Protection Status

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)

no

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

no

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)

no

0,0,1

0,0,0

0,1,1

1,0,1

0,1,1

no

0,1,1

0,1,1

0,1,1

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

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.

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