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LHF00L28
Table 5. Functions of Block Lock (5) and Block Lock-Down
11
State
WP#/ACC
Current State
DQ 1(1) DQ 0(1)
State Name
Erase/Program Allowed (2)
[000]
[001] (3)
[011]
[100]
[101] (3)
[110] (4)
[111]
0
0
0
1
1
1
1
0
0
1
0
0
1
1
0
1
1
0
1
0
1
Unlocked
Locked
Locked-down
Unlocked
Locked
Lock-down Disable
Lock-down Disable
Yes
No
No
Yes
No
Yes
No
NOTES:
1. DQ 0 =1: a block is locked; DQ 0 =0: a block is unlocked.
DQ 1 =1: a block is locked-down; DQ 1 =0: a block is not locked-down.
2. Erase and program are general terms, respectively, to express: block erase, full chip erase and
program operations.
3. At power-up or device reset, all blocks default to locked state and are not locked-down, that is,
[001] (WP#/ACC=0) or [101] (WP#/ACC=1), regardless of the states before power-off or reset
operation.
4. When WP#/ACC is driven to V IL in [110] state, the state changes to [011] and the blocks are
automatically locked.
5. OTP (One Time Program) block has the lock function which is different from those described
above.
Table 6. Block Locking State Transitions upon Command Write (4)
Current State
Result after Lock Command Written (Next State)
State
[000]
[001]
[011]
[100]
[101]
[110]
[111]
WP#/ACC
0
0
0
1
1
1
1
DQ 1
0
0
1
0
0
1
1
DQ 0
0
1
1
0
1
0
1
Set Lock (1)
[001]
No Change (3)
No Change
[101]
No Change
[111]
No Change
Clear Lock (1)
No Change
[000]
No Change
No Change
[100]
No Change
[110]
Set Lock-down (1)
[011] (2)
[011]
No Change
[111] (2)
[111]
[111] (2)
No Change
NOTES:
1. "Set Lock" means Set Block Lock Bit command, "Clear Lock" means Clear Block Lock Bit
command and "Set Lock-down" means Set Block Lock-Down Bit command.
2. When the Set Block Lock-Down Bit command is written to the unlocked block (DQ 0 =0), the
corresponding block is locked-down and automatically locked at the same time.
3. "No Change" means that the state remains unchanged after the command written.
4. In this state transitions table, assumes that WP#/ACC is not changed and fixed V IL or V IH .
Rev. 2.45
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