n82802 Intel Corporation, n82802 Datasheet - Page 25

• Manufacturer Part Number: n82802
• Description: Firmware Hub Fwh
• Manufacturer: Intel Corporation

4.9.1.
Datasheet
Table 6.
Note: The write-lock bit must be set to the desired protection state prior to starting a program or erase
R
T_BLOCK_LK and T_MINUSxx_LK — Block-Locking Registers
Memory Address:
Default Value:
Access:
Size:
operation, since it is sampled at the beginning of the operation. Changing the state of the write-lock bit
during a program or erase operation may cause unpredictable results. If the state of the write-lock bit
changes during a program suspend or erase suspend state, changes in the block’s locking status do not
occur immediately. The suspended operation may be resumed successfully. The new lock status will take
place after the program or erase operation completes. The individual bit functions are described in the
following sections.
7:3
Bit
Data
Register-Based Locking Value Definitions
01h
00h
02h
03h
04h
05h
06h
07h
2
1
0
Reserved
Read-Lock
1 = Prevents read operations in the block where set.
0 = Normal operation for reads in the block where clear. This is the default state.
Lock-Down
1 = Prevents further set or clear operations to the Write Lock and Read Lock bits. Lock-Down only can
0 = Normal operation for Write Lock and Read Lock bit altering in the block where clear. This is the
Write-Lock
1 = Prevents program or erase operations in the block where set. This is the default state.
0 = Normal operation for programming and erase in the block where clear.
Reserved
Data 7:3
00000
00000
00000
00000
00000
00000
00000
00000
be set, but not cleared. The block will remain locked-down until reset (with RST# or INIT#), or until
the device is power-cycled.
default state.
Read Lock,
Data 2
0
0
0
0
1
1
1
1
Lock-Down,
FFBx0002h (x = F-0h)
01h
R/W
8 bits (each)
Data 1
0
0
1
1
0
0
1
1
Function
Write Lock,
Data 0
0
1
0
1
0
1
0
1
Intel
Full access
Write locked. Default state at power-
up
Locked open (full access locked down).
Write-locked down.
Read locked.
Read and write locked.
Read-locked down.
Read- and write-locked down.
®
82802AB/AC Firmware Hub
Resulting block state
(1)
.
25