JS48F4400P0P3C0 datasheet(96/139 Pages) NUMONYX

96 / 139 page

Numonyx™ StrataFlash® Cellular Memory (M18)

Datasheet

April 2008

309823-10

To lock, unlock, or lock-down a block, first issue the setup command to any address

within the desired block. The read mode of the addressed partition is automatically

changed to Read Status Register mode. Next, issue the desired confirm command to

the block’s address. Note that the confirm command determines the operation

performed. The Status Register should be checked for any errors, and then cleared.

The lock status of a block can be determined by issuing the Read Device Information

command, and then reading from <block base address> + 02h. DQ0 indicates the lock

status of the addressed block (0 = unlocked, 1 = locked), and DQ1 indicates the lock-

down status of the addressed block (0 = lock-down not issued; 1 = locked-down

issued). Section 9.4.3, “Read Device Information” on page 82 summarizes the details

of this operation.

Blocks cannot be locked or unlocked while being actively programmed or erased. Blocks

can be locked or unlocked during erase-suspend, but not during program-suspend.

Note:

If a block-erase operation is suspended, and then the block is locked or locked down,

the lock status of the block will be changed immediately. When resumed, the erase

operation will still complete.

Block lock-down protection is dependent on WP#. When WP# = VIL, blocks locked

down are locked, and cannot be unlocked using the Block Unlock command. When

WP# = VIH, block lock-down protection is disabled—locked-down blocks can be

individually unlocked using the Block Unlock command. Subsequently, when WP# =

VIL, previously locked-down blocks are once again locked and locked-down, including

locked-down blocks that may have been unlocked while WP# was de-asserted.

A locked-down block can only be unlocked by issuing the Unlock Block command with

WP# deasserted. To return an unlocked block to the locked-down state, a Lock-Down

command must be issued prior to asserting WP#.

Issuing the Block Lock-Down command to an unlocked block does not lock the block.

However, asserting WP# after issuing the Block Lock-Down command locks (and locks

down) the block. Lock-down for all blocks is cleared upon power-up or exit from reset.

Figure 49 summarizes block-locking operations.

Table 46: Block Locking Command Bus Cycles

Command

Setup Write Cycle

Confirm Write Cycle

Address Bus

Data Bus

Address Bus

Data Bus

Lock Block

Block Address

0060h

Block Address

0001h

Unlock Block

Block Address

0060h

Block Address

00D0h

Lock-Down Block

Block Address

0060h

Block Address

002Fh

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