lh28f640 Sharp Microelectronics of the Americas, lh28f640 Datasheet - Page 13

• Manufacturer Part Number: lh28f640
• Description: 64m X16 Flash Memory
• Manufacturer: Sharp Microelectronics of the Americas

NOTES:
1. DQ
2. Erase and program are general terms, respectively, to express: block erase, full chip erase and
3. At power-up or device reset, all blocks default to locked state and are not locked-down, that is,
4. OTP (One Time Program) block has the lock function which is different from those described
NOTES:
1. "Set Lock" means Set Block Lock Bit command, "Clear Lock" means Clear Block Lock Bit
2. When the Set Block Lock-Down Bit command is written to the unlocked block (DQ
3. "No Change" means that the state remains unchanged after the command written.
State
[00]
[01]
[10]
[11]
(page buffer) program operations.
[01] regardless of the states before power-off or reset operation.
above.
command and "Set Lock-down" means Set Block Lock-Down Bit command.
corresponding block is locked-down and automatically locked at the same time.
DQ
[00]
[01]
[10]
[11]
State
Current State
0
1
=1: a block is locked; DQ
(3)
=1: a block is locked-down; DQ
DQ
0
0
1
1
Table 6. Block Locking State Transitions upon Command Write
1
DQ
Table 5. Functions of Block Lock
DQ
0
0
1
1
1
0
1
0
1
(1)
0
Current State
DQ
0
1
0
1
Set Lock
No Change
No Change
0
(1)
0
Result after Lock Command Written (Next State)
[01]
[11]
=0: a block is unlocked.
Unlocked
Locked
Unlocked
Locked
(1)
1
=0: a block is not locked-down.
LHF64FZ2
State Name
No Change
Clear Lock
(4)
No Change
and Block Lock-Down
[00]
[10]
(1)
(3)
Erase/Program Allowed
Set Lock-down
No Change
[11]
[11]
[11]
Yes
Yes
No
No
(2)
(2)
(1)
0
(2)
=0), the
Rev. 2.41
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