lrs1805a Sharp Microelectronics of the Americas, lrs1805a Datasheet - Page 13

• Manufacturer Part Number: lrs1805a
• Description: Stacked Chip Flash Memory Smartcombo
• Manufacturer: Sharp Microelectronics of the Americas

sharp
5.3 Functions of Block Lock and Block Lock-Down
Notes:
5.4 Block Locking State Transitions upon Command Write
Notes:
1. DQ
3. “No Change” means that the state remains unchanged after the command written.
4. In this state transitions table, assumes that F-WP is not changed and fixed V
2. Erase and program are general terms, respectively, to express: block erase, full chip erase and (page buffer) program
3. At power-up or device reset, all blocks default to locked state and are not locked-down, that is, [001] (F-WP = 0) or [101]
4. When F-WP is driven to V
1. “Set Lock” means Set Block Lock Bit command, “Clear Lock” means Clear Block Lock Bit command and “Set Lock-
2. When the Set Block Lock-Down Bit command is written to the unlocked block (DQ
[000]
[001]
[100]
[101]
[011]
[110]
[111]
State
[000]
[001]
[011]
[100]
[101]
[110]
[111]
State
DQ
operations.
(F-WP = 1), regardless of the states before power-off or reset operation.
down” means Set Block Lock-Down Bit command.
locked-down and automatically locked at the same time.
(3)
(3)
(4)
0
1
= 1: a block is locked; DQ
= 1: a block is locked-down; DQ
F-WP
Current State
0
0
0
1
1
1
1
F-WP
0
0
1
1
0
1
1
DQ
0
0
1
0
0
1
1
1
DQ
IL
0
0
1
0
0
1
1
DQ
in [110] state, the state changes to [011] and the blocks are automatically locked.
1
(1)
0
1
1
0
1
0
1
0
0
= 0: a block is unlocked.
Current State
1
= 0: a block is not locked-down.
DQ
0
1
1
0
1
0
1
0
No Change
(1)
No Change
No Change
No Change
Set Lock
[001]
[101]
[111]
L R S 1 8 0 5 A
Unlocked
Locked
Locked-down
Unlocked
Locked
Lock-down Disable
Lock-down Disable
(1)
(4)
Result after Lock Command Written (Next State)
(3)
State Name
Clear Lock
No Change
No Change
No Change
No Change
IL
[000]
[100]
[110]
or V
IH
(1)
.
0
= 0), the corresponding block is
Erase/Program Allowed
Set Lock-down
No Change
No Change
Yes
Yes
Yes
No
No
No
No
[111]
[111]
[011]
[011]
[111]
(2)
(2)
(2)
(1)
(2)
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