PC28F256P30BFA Datasheet, PDF(42/98 Page) Micron Technology – Micron Parallel NOR Flash Embedded Memory (P30-65nm)

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PC28F256P30BFA Datasheet, PDF (42/98 Pages) Micron Technology – Micron Parallel NOR Flash Embedded Memory (P30-65nm)

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Figure 12: Block Locking State Diagram

256Mb and 512Mb (256Mb/256Mb), P30-65nm

Security Operations

Program/Erase Allowed

WP# = VIL = 0

Program/Erase Allowed

WP# = VIH = 1

[000]

D0h

WP# toggle

[110]

D0h

[100]

D0h

(Power-up/

01h

[001] Reset default)

2Fh

[010]

D0h, 01h, or 2Fh

(Virtual lock-down)

2Fh

[011] (Locked down)

WP# toggle

Program/Erase Prevented

WP# = VIL = 0

01h/2Fh

2Fh

01h

[111]

2Fh

[101]

(Lock down

disabled,

WP# = VIH)

(Power-up/

Reset default)

Program/Erase Prevented

WP# = VIH = 1

Note: 1. D0h = UNLOCK command; 01h = LOCK command; 60h (not shown) LOCK SETUP com-

mand; 2Fh = LOCK DOWN command.

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 SR7 and SR6 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 BLOCK UNLOCK operations, re-

sume the ERASE operation using the ERASE RESUME command.

Note:

A BLOCK LOCK SETUP command followed by any command other than BLOCK LOCK,

BLOCK UNLOCK, or BLOCK LOCK DOWN produces a command sequence error and

set SR4 and SR5. If a command sequence error occurs during an erase suspend, SR4 and

SR5 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 op-

eration, possible erase errors may be masked by the command sequence error.

If a block is locked or locked-down during an erase suspend of the same block, the lock

status bits change immediately. However, the ERASE operation completes when it is re-

sumed. BLOCK LOCK operations cannot occur during a program suspend.

PDF: 09005aef84566799

p30_65nm_MLC_256Mb-512mb.pdf - Rev. C 12/13 EN

Micron Technology, Inc. reserves the right to change products or specifications without notice.

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