82802AC datasheet(25/53 Pages) INTEL

25 / 53 page

Intel

® 82802AB/AC Firmware Hub

Datasheet

4.9.1.

T_BLOCK_LK and T_MINUSxx_LK — Block-Locking Registers

Memory Address:

FFBx0002h (x = F-0h)

Default Value:

01h

Access:

R/W

Size:

8 bits (each)

Bit

Function

7:3

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

be set, but not cleared. The block will remain locked-down until reset (with RST# or INIT#), or until

the device is power-cycled.

0 = Normal operation for Write Lock and Read Lock bit altering in the block where clear. This is the

default state.

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.

Table 6.

Data

Reserved

Data 7:3

Read Lock,

Data 2

Lock-Down,

Data 1

Write Lock,

Data 0

Resulting block state (1).

00h

00000

Full access

01h

00000

Write locked. Default state at power-

02h

00000

Locked open (full access locked down).

03h

00000

Write-locked down.

04h

00000

Read locked.

05h

00000

Read and write locked.

06h

00000

Read-locked down.

07h

00000

Read- and write-locked down.

Note: The write-lock bit must be set to the desired protection state prior to starting a program or erase

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.

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