4.10 Processor Interface Signals
Name
Type
Description
RCIN#
I
Keyboard Controller Reset CPU:
The keyboard controller
can generate INIT# to the processor. This saves the external
OR gate with the PCH’s other sources of INIT#. When the
PCH detects the assertion of this signal, INIT# is generated for
16 PCI clocks.
NOTE:
The PCH will ignore RCIN# assertion during
transitions to the S3, S4, and S5 states.
A20GATE
I
A20 Gate:
A20GATE is from the keyboard controller. The
signal acts as an alternative method to force the A20M# signal
active. It saves the external OR gate needed with various other
copyists.
PROCPWRGD
O
Processor Power Good:
This signal should be connected to
the processor’s VCCPWRGOOD_1 and VCCPWRGOOD_0
input to indicate when the processor power is valid.
4.1.11 SM Bus Interface Signals
Name
Type
Description
SMBDATA
I/OD
SMBus Data:
External pull-up resistor is required.
SMBCLK
I/OD
SMBus Clock:
External pull-up resistor is required.
SMBALERT# /
GPIO11
I
SMBus Alert:
This signal is used to wake the system or
generate SMI#.
This signal may be used as GPIO11