JS28F256P33BFE datasheet(31/90 Pages) MICRON

31 / 90 page

Datasheet

Aug 2009

Order Number:320003-08

P33-65nm

10.1.4

Block Lock Status

The Read Device Identifier command is used to determine a block’s lock status (see

Section 7.3, “Read Device Identifier” on page 22). Data bits DQ[1:0] display the

addressed block’s lock status; DQ0 is the addressed block’s lock bit, while DQ1 is the

addressed block’s lock-down bit.

Note:

LK: Lock Setup Command, 60h; LK/D0h: Unlock Command; LK/01h: Lock Command; LK/2Fh: Lock-Down Command.

10.1.5

Block Locking During Suspend

Block lock and unlock changes can be performed during an erase suspend. To change

block locking during an erase operation, first issue the Erase Suspend command.

Monitor the Status Register until SR.7 and SR.6 are set, indicating the device is

suspended and ready to accept another command.

Next, write the desired lock command sequence to a block, which changes the lock

state of that block. After completing block lock or unlock operations, resume the erase

operation using the Erase Resume command.

Note:

A Lock Block Setup command followed by any command other than Lock Block, Unlock

Block, or Lock-Down Block produces a command sequence error and set Status

suspend, SR.4 and SR.5 remains set, even after the erase operation is resumed. Unless

the Status Register is cleared using the Clear Status Register command before

resuming the erase operation, possible erase errors may be masked by the command

sequence error.

Figure 8: Block Locking State Diagram

[0 0 0 ]

[0 0 1 ]

[0 1 1 ]

[1 1 1 ]

[1 0 1 ]

[1 1 0 ]

[1 0 0 ]

LK /

D0 h

LK /

01 h

LK /

2F h

L K /2 F

LK /

D0 h

LK /

01h o r 2 F h

LK /

D0 h

LK /

01 h

LK /

2F h

LK /

2F h

PG M /ER A S E

A LLO W E D

PG M /ER A S E

PR EV EN T E D

WP # = V

IL = 0

WP # = V

IH = 1

Po w e r -U p /

R e s e t D e fa u lt

Po w e r - U p /

Re s e t De f a u lt

L o cke d - d o w n

L o ck ed -d o w n

is d is a b le d b y

WP # = V

V ir t u a l lo c k -

do w n

An y L o c k

co m m an d s

WP # t o g g le

P #

g g

[0 1 0 ]

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