FW82801E Intel, FW82801E Datasheet - Page 44

• Manufacturer Part Number: FW82801E
• Description: Communications I/O Controller Hub
• Manufacturer: Intel

Intel
3.2.12
3.2.13
3.2.14
44
Table 17. Processor Interface Signals (Sheet 2 of 2)
Table 18. SMBus Interface Signals
Table 19. System Management Interface Signals
Table 20. Real Time Clock Interface
®
82801E C-ICH
SMBus Interface
Real Time Clock Interface
System Management Interface
SMBALERT#
SMLINK[1:0]
INTRUDER#
CPUPWRGD
SMBDATA
/GPIO[11]
SMBCLK
A20GATE
RTCX1
RTCX2
Name
Name
Name
RCIN#
Name
Special
Special
Type
Type
I/OD
I/OD
I/OD
Type
Type
OD
I
I
I
I
SMBus Data: External pull-up is required.
SMBus Clock: External pull-up is required.
SMBus Alert: This signal is used to wake the system or generate an SMI#. If not
used for SMBALERT#, it can be used as a GPI.
Intruder Detect: This signal can be set to disable system if box detected open.
This signal’s status is readable, so it can be used like a GPI if the Intruder
Detection is not needed.
System Management Link: These signals are an SMBus link to an optional
external system management ASIC or LAN controller. External pull-ups are
required.
NOTE: SMLINK[0] corresponds to an SMBus Clock signal and SMLINK[1]
Keyboard Controller Reset Processor: The keyboard controller can generate
INIT# to the processor. This saves the external OR gate with the 82801E C-ICH’s
other sources of INIT#. When the 82801E C-ICH detects the assertion of this
signal, INIT# is generated for 16 PCI clocks.
A20 Gate: This signal is from the keyboard controller. It acts as an alternative
method to force the A20M# signal active. A20GATE saves the external OR gate
needed with various other PCIsets.
Processor Power Good: This signal should be connected to the processor’s
PWRGOOD input. This is an open-drain output signal (external pull-up resistor
required) that represents a logical AND of the 82801E C-ICH’s PWROK and
VRMPWRGD signals.
Crystal Input 1: This signal is connected to the 32.768 KHz crystal. If no
external crystal is used, then RTCX1 can be driven with the desired clock rate.
Crystal Input 2: This signal is connected to the 32.768 KHz crystal. If no
external crystal is used, then RTCX2 should be left floating.
corresponds to an SMBus Data signal.
Description
Description
Description
Description
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