M28W640 datasheet(18/54 Pages) STMICROELECTRONICS

部件名	M28W640

功能描述	64 Mbit 4Mb x16, Boot Block 3V Supply Flash Memory

PDF	54 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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18 / 54 page

M28W640CT, M28W640CB

18/54

Table 9. 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 andA0=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.

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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