M28W320FCT datasheet(27/69 Pages) STMICROELECTRONICS

부품명	M28W320FCT

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

PDF	69 Pages

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제조업체	STMICROELECTRONICS [STMicroelectronics]

홈페이지	http://www.st.com

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27 / 69 page

M28W320FCT, M28W320FCB

Block locking

27/69

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)

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)

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.

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

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

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