lrs1808a ETC-unknow, lrs1808a Datasheet - Page 13

• Manufacturer Part Number: lrs1808a
• Description: 32m X16 Flash + 16m X16 Scram
• Manufacturer: ETC-unknow

5.3 Functions of Block Lock and Block Lock-Down
Notes:
5.4 Block Locking State Transitions upon Command Write
Notes:
1. DQ
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
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
[000]
[001]
[011]
[100]
[101]
[110]
State
[111]
[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
0
1
1
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)
Set Lock
No Change
No Change
No Change
[001]
[101]
[111]
L R S 1 8 0 8 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)
11