NP8P128A13BSM60E Micron Technology Inc, NP8P128A13BSM60E Datasheet - Page 31

• Manufacturer Part Number: NP8P128A13BSM60E
• Manufacturer: Micron Technology Inc

Specifications of NP8P128A13BSM60E

• Lead Free Status / Rohs Status: Supplier Unconfirmed

Numonyx® Omneo™ P8P Datasheet
Table 13: Block Locking Truth Table
10.1.3
10.1.4
10.1.5
10.1.6
August 2010
316144-07
> V
> V
≤ V
V
PP
PPLK
PPLK
PPLK
Unlock Block
The Unlock Block command unlocks locked blocks (if block isn’t locked-down) so they
can be programmed or erased. Unlocked blocks return to the locked state at device
reset or power-down.
Lock-Down Block
Locked-down blocks (state 3 or [011]) are protected from write and erase operations
(just like locked blocks), but software commands alone cannot change their protection
state. When WP# is V
Unlock command (60h/D0h) must be issued to unlocked locked-down block (state 6 or
[110]), prior to modifying data in these blocks. To return an unlocked block to locked-
down state, a Lock command (60h/01h) must be issued prior to changing WP# to V
(state 7 or [111] and then state 3 or [011]). A locked or unlocked block can be locked-
down by writing the Lock-Down Block command sequence. Locked-down blocks revert
to the locked state at device reset or power-down.
WP# Lock-Down Control
WP# = V
page
blocks [011] from write, erase, and lock status changes. When WP# = 1, the lock-
down function is disabled [111] and a software command can individually unlock
locked-down blocks [110] so they can be erased and written. When the lock-down
function is disabled, locked-down blocks remain locked, and must first be unlocked by
writing the Unlock command prior to modifying data in these blocks. These blocks can
then be re-locked [111] and unlocked [110] while WP# remains high.
When WP# goes low, blocks in re-locked state [111] returns to locked-down state
[011]. However, WP# going low changes blocks at unlocked state [110] to [010] or
“virtual lock-down” state. When the lock status of a “virtual lock-down” blocks is read,
it appears to be a “locked-down” state to user when WP# is V
down” will be immediately unlocked when WP# is V
down”, a Lock command must be issued to an unlocked block prior to WP# going low.
Device reset or power-down resets all blocks to the locked state[101] or [001],
including locked-down blocks.
Block Lock Status
Every block’s lock status can be read in the device’s read identifier mode. To enter this
mode, write 90h to the device. Subsequent reads at Block base-address + 00002h
output that block’s lock status. Data bits DQ
indicates the block lock/unlock state as set by the Lock command and cleared by the
Unlock command. It is also automatically set when entering Lock-Down. DQ
lock-down state as set by the Lock-Down command. It cannot be cleared by software,
only by device reset or power-down. See
page
WP#
V
V
V
IH
IH
IL
30. The WP# signal controls the lock-down function. WP# = 0 protects lock-down
32.
IH
overrides the block lock-down. See
RST#
V
V
V
IH
IH
IH
IH
, the lock-down function is disabled (state 7 or [111]), and an
All blocks write/erase protected
All Lock-Down and Locked
blocks write/erase protected
All Lock-Down and Locked
blocks write/erase protected
Block Write Protection
Table 14, “Block Locking State Transitions” on
0
and DQ
Table 13, “Block Locking Truth Table” on
IH
All Lock-Down block states may be
changed
Lock-Down block states may not be
changed
All Lock-Down block states may be
changed
. Therefore, to avoid “virtual lock-
1
represent the lock status. DQ
IL
Block Lock Bits
. Blocks in “virtual lock-
1
indicates
IL
0
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