M28W640FCT_06 datasheet(29/77 Pages) STMICROELECTRONICS

No. de pieza	M28W640FCT

Descripción Electrónicos	64 Mbit (4Mbx16, Boot Block) 3V Supply Flash memory

PDF	77 Pages

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Fabricante Electrónico	STMICROELECTRONICS [STMicroelectronics]

Página de inicio	http://www.st.com

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M28W640FCT, M28W640FCB

Block locking

29/77

Table 10.

Protection status

Current Protection Status(1)

(WP, DQ1, DQ0)

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.

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)

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

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)

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

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