M28R400CT, M28R400CB
Table 8. Block Lock Status
Item
Address
Data
Block Lock Configuration
LOCK
DQ0=0
DQ0=1
DQ1=1
Block is Unlocked
Block is Locked
xx002
Block is Locked-Down
Table 9. Protection Status
Current
(1)
Next Protection Status
(WP, DQ1, DQ0)
(1)
Protection Status
(WP, DQ1, DQ0)
After
Block Lock
Command
After
Block Unlock
Command
After Block
Lock-Down
Command
Program/Erase
Allowed
After
WP transition
Current State
1,0,0
yes
no
1,0,1
1,0,1
1,1,1
1,1,1
0,0,1
0,0,1
1,0,0
1,0,0
1,1,0
1,1,0
0,0,0
0,0,0
1,1,1
1,1,1
1,1,1
1,1,1
0,1,1
0,1,1
0,0,0
0,0,1
0,1,1
0,1,1
1,0,0
1,0,1
(2)
1,0,1
1,1,0
1,1,1
0,0,0
yes
no
yes
no
(2)
0,0,1
(3)
0,1,1
no
0,1,1
0,1,1
0,1,1
1,1,1 or 1,1,0
Note: 1. The protection status is defined by the write protect pin and by DQ1 (‘1’ for a locked-down block) and DQ0 (‘1’ for a locked block)
as read in the Read Electronic Signature command with A1 = V and A0 = V .
IH
IL
2. All blocks are locked at power-up, so the default configuration is 001 or 101 according to WP status.
3. A WP transition to V on a locked block will restore the previous DQ0 value, giving a 111 or 110.
IH
16/48
NUMONYX [ NUMONYX B.V ]
