W39V040FA
Block Locking Registers
This part provides 8 even 64Kbytes blocks, and each block can be locked by register control. These
control registers can be set or clear through memory address. Below is the detail description.
Block Locking Registers type and access memory map Table
REGISTERS
BLR7
BLR6
BLR5
BLR4
BLR3
BLR2
BLR1
BLR0
REGISTERS
TYPE
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
CONTROL
BLOCK
7
6
5
4
3
2
1
0
DEVICE PHYSICAL
ADDRESS
7FFFFh – 70000h
6FFFFh – 60000h
5FFFFh – 50000h
4FFFFh – 40000h
3FFFFh – 30000h
2FFFFh – 20000h
1FFFFh – 10000h
0FFFFh – 00000h
4GBYTES SYSTEM
MEMORY ADDRESS
FFBF0002h
FFBE0002h
FFBD0002h
FFBC0002h
FFBB0002h
FFBA0002h
FFB90002h
FFB80002h
Block Locking Register Bits Function Table
BIT
FUNCTION
7–3
2
1
0
Reserved
Read Lock
1: Prohibit to read in the block where set
0: Normal read operation in the block where clear. This is default state.
Lock Down
1: Prohibit further to set or clear the Read Lock or Write Lock bits. This Lock Down
Bit can only be set not clear. Only the device is reset or re-powered, the Lock
Down Bit is cleared.
0: Normal operation for Read Lock or Write Lock. This is the default state.
Write Lock
1: Prohibited to write in the block where set. This is default state.
0: Normal programming/erase operation in the block where clear.
Register Based Block Locking Value Definitions Table
BIT [7:3]
00000
00000
00000
00000
00000
00000
00000
00000
BIT 2
0
0
0
0
1
1
1
1
BIT 1
0
0
1
1
0
0
1
1
BIT 0
0
1
0
1
0
1
0
1
Full Access.
Write Lock. Default State.
Locked Open (Full Access, Lock Down).
Write Locked, Locked Down.
Read Locked.
Read & Write Locked.
Read Locked, Locked Down.
Read & Write Locked, Locked Down.
RESULT
-6-
WINBOND [ WINBOND ]
