82801E datasheet(44/84 Pages) INTEL

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Intel® 82801E C-ICH

Advance Information Datasheet

3.2.12

SMBus Interface

3.2.13

System Management Interface

3.2.14

Real Time Clock Interface

RCIN#

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.

A20GATE

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.

CPUPWRGD

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.

Table 18. SMBus Interface Signals

Name

Type

Description

SMBDATA

I/OD

SMBus Data: External pull-up is required.

SMBCLK

I/OD

SMBus Clock: External pull-up is required.

SMBALERT#

/GPIO[11]

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.

Table 19. System Management Interface Signals

Name

Type

Description

INTRUDER#

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.

SMLINK[1:0]

I/OD

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]

corresponds to an SMBus Data signal.

Table 20. Real Time Clock Interface

Name

Type

Description

RTCX1

Special

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.

RTCX2

Special

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.

Table 17. Processor Interface Signals (Sheet 2 of 2)

Name

Type

Description

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