ADP315PC87570 National Semiconductor, ADP315PC87570 Datasheet - Page 59

• Manufacturer Part Number: ADP315PC87570
• Description: Keyboard and Power Management Controller
• Manufacturer: National Semiconductor

may load it with an address and lock it against any fur-
ther writes. This guarantees that the address does not
change due to a software bug.
The initiation key contains a series of 32 values. The
first 30 values match 30 values that the LFSR Register
generates, starting from 6Ah. To avoid conflict with oth-
er devices that use PnP ISA Specification 1.0a, the last
two values must be 00h.
The values in the initiation key, in hexadecimal notation,
reading from left to right and top to bottom, must be:
If the sequence is successfully completed, the PC87570
enables the configuration base address update.
If any of the write operations in this sequence do not
match, the enable process is stopped and the hardware
resets the LFSR Register to its initial value (step 1). The
following two write operations define the FFD Configu-
ration Register Base Address, SBAH and SBAL, in that
order.
Detection
I/O Write
Reset or
Figure 5-6. Initiation Key Generation (LFSR)
6A, B5, DA, ED, F6, FB, 7D, BE,
DF, 6F, 37, 1B, 0D, 86, C3, 61,
B0, 58, 2C, 16, 8B, 45, A2, D1,
E8, 74, 3A, 9D, CE, E7, 00, 00.
Error
Preset Value = 6Ah
Shift Clock
Preset Control
7
6
5
Key Output
4
Shift Direction
3
2
1
Host Bus Interface (HBI)
0
59
Any other I/O
transaction
Any other I/O
transaction
Any other I/O
transaction
Figure 5-7. Initialization Sequence
0279h, 03F0h or 03BDh
I/O write to the saved
I/O write to the saved
I/O write to the saved
address
address
Reset signal inactive
I/O Write to
address
No
No
Update SBAH with
Update SBAL with
Save the address
Index and Data
the next value
the first value
Registers are
the last value
update mode
update mode
next value of
Wait for key
Wait for the
of the key?
in the key?
in the key?
accessible
the data
the data
the key
SBAH
Reset
Is this
Is this
Is this
SBAL
End
Yes
Yes
Yes
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transaction
No
other
Any
I/O