LH28F320BFHE-PBTLZ2 View Datasheet(PDF) - Sharp Electronics
Part Name
Description
MFG CO.
'LH28F320BFHE-PBTLZ2' PDF : 36 Pages View PDF
LHF32FD2
12
Table 7. Functions of Block Lock(5) and Block Lock-Down
State
[000]
[001](3)
[011]
WP#
0
0
0
Current State
DQ1(1) DQ0(1)
0
0
0
1
State Name
Unlocked
Locked
1
1
Locked-down
Erase/Program Allowed (2)
Yes
No
No
[100]
1
0
0
Unlocked
Yes
[101](3)
1
0
1
Locked
No
[110](4)
1
1
0
Lock-down Disable
Yes
[111]
1
1
1
Lock-down Disable
No
NOTES:
1. DQ0=1: a block is locked; DQ0=0: a block is unlocked.
DQ1=1: a block is locked-down; DQ1=0: a block is not locked-down.
2. Erase and program are general terms, respectively, to express: block erase, full chip erase and
(page buffer) program operations.
3. At power-up or device reset, all blocks default to locked state and are not locked-down, that is,
[001] (WP#=0) or [101] (WP#=1), regardless of the states before power-off or reset operation.
4. When WP# is driven to VIL 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 8. Block Locking State Transitions upon Command Write(4)
Current State
Result after Lock Command Written (Next State)
State WP# DQ1 DQ0
[000] 0
0
0
[001] 0
0
1
[011] 0
1
1
[100] 1
0
0
[101] 1
0
1
[110] 1
1
0
[111] 1
1
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 (DQ0=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# is not changed and fixed VIL or VIH.
Rev. 2.44
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