m28w320fcb STMicroelectronics, m28w320fcb Datasheet - Page 27

• Manufacturer Part Number: m28w320fcb
• Description: 32 Mbit 2mb X16, Boot Block 3v Supply Flash Memory
• Manufacturer: STMicroelectronics

M28W320FCT, M28W320FCB
Table 10.
1. The lock status is defined by the write protect pin and by DQ1 (‘1’ for a locked-down block) and DQ0 (‘1’ for a locked block)
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
Current State
as read in the Read Electronic Signature command with A1 = V
Current Protection Status
1,0,1
0,0,1
1,0,0
1,1,0
1,1,1
0,0,0
0,1,1
(WP, DQ1, DQ0)
(2)
(2)
Protection Status
Program/Erase
IH
on a locked block will restore the previous DQ0 value, giving a 111 or 110.
Allowed
yes
yes
yes
no
no
no
no
(1)
Block Lock
Command
After
1,0,1
1,0,1
1,1,1
1,1,1
0,0,1
0,0,1
0,1,1
IH
Block Unlock
Command
and A0 = V
Next Protection Status
After
1,0,0
1,0,0
1,1,0
1,1,0
0,0,0
0,0,0
0,1,1
(WP, DQ1, DQ0)
IL
.
Lock-Down
After Block
Command
1,1,1
1,1,1
1,1,1
1,1,1
0,1,1
0,1,1
0,1,1
(1)
1,1,1 or 1,1,0
WP transition
Block locking
After
0,0,0
0,0,1
0,1,1
0,1,1
1,0,0
1,0,1
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(3)