lrs1830 Sharp Microelectronics of the Americas, lrs1830 Datasheet - Page 16

• Manufacturer Part Number: lrs1830
• Description: Stacked Chip 256m X16 Boot Block Flash And 32m X16 Scram
• Manufacturer: Sharp Microelectronics of the Americas

6.2.3 Functions of Block Lock and Block Lock-Down
Notes:
6.2.4 Block Locking State Transitions upon Command Write
Notes:
1. DQ
2. Erase and program are general terms, respectively, to express: block erase, bank 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] (WP/A
4. When WP/A
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
3. “No Change” means that the state remains unchanged after the command written.
4. In this state transitions table, assumes that WP/A
[000]
[001]
[011]
[100]
[101]
[110]
[111]
[000]
[001]
[011]
[100]
[101]
[110]
[111]
State
State
DQ
operations.
[101] (WP/A
down” means Set Block Lock-Down Bit command.
locked-down and automatically locked at the same time.
sharp
(3)
(3)
(4)
0
1
= 1: a block is locked; DQ
= 1: a block is locked-down; DQ
WP/A
WP/A
Current State
0
0
0
1
1
1
1
CC
CC
CC
0
0
0
1
1
1
1
is driven to V
CC
= “1”), regardless of the states before power-off or reset operation.
DQ
0
0
1
0
0
1
1
DQ
1
0
0
1
0
0
1
1
1
(1)
IL
0
in [110] state, the state changes to [011] and the blocks are automatically locked.
Current State
DQ
= 0: a block is unlocked.
0
1
1
0
1
0
1
DQ
0
1
0
1
1
0
1
0
1
= 0: a block is not locked-down.
0
(1)
No Change
Set Lock
No Change
No Change
No Change
CC
Unlocked
Locked
Locked-down
Unlocked
Locked
Lock-down Disable
Lock-down Disable
L R S1 8 3 0
[001]
[101]
[111]
is not changed and fixed V
(4)
Result after Lock Command Written (Next State)
(1)
State Name
(3)
Clear Lock
No Change
No Change
No Change
No Change
[000]
[100]
[110]
IL
or V
IH
(1)
0
.
= 0), the corresponding block is
Erase/Program Allowed
Set Lock-down
Yes
Yes
Yes
No
No
No
No
No Change
No Change
[011]
[011]
[111]
[111]
[111]
CC
(2)
(2)
(2)
= “0”) or
(2)
(1)
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