82801DB datasheet(39/587 Pages) INTEL

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Intel® 82801DB ICH4 Datasheet

Signal Description

2.1

Hub Interface to Host Controller

2.2

Link to LAN Connect

Table 2-1. Hub Interface Signals

Name

Type

Description

HI[11:0]

I/O

Hub Interface Signals

HI_STB /

HI_STBS

I/O

Hub Interface Strobe/ Hub Interface Strobe Second: One of two differential

strobe signals used to transmit and receive data through the hub interface.

Hub Interface 1.5 mode this signal is not differential and is the second of the

two strobe signals.

HI_STB# /

HI_STBF

I/O

Hub Interface Strobe Complement / Hub Interface Strobe First: One of two

differential strobe signals used to transmit and receive data through the hub

interface.

Hub Interface 1.5 mode this signal is not differential and is the first of the two

strobe signals.

HICOMP

I/O

Hub Interface Compensation: Used for hub interface buffer compensation.

HI_VSWING

Hub Interface Voltage Swing: Analog input used to control the voltage swing

and impedance strength of hub interface pins.

NOTES:

1. Refer to the platform design guide for expected voltages.

2. Refer to the platform design guide for resistor values and routing guidelines

for each hub interface mode.

Table 2-2. LAN Connect Interface Signals

Name

Type

Description

LAN_CLK

LAN I/F Clock: Driven by the LAN Connect component. Frequency range is

5MHz to 50 MHz.

LAN_RXD[2:0]

Received Data: The LAN Connect component uses these signals to transfer

data and control information to the integrated LAN controller. These signals

have integrated weak pull-up resistors.

LAN_TXD[2:0]

Transmit Data: The integrated LAN controller uses these signals to transfer

data and control information to the LAN Connect component.

LAN_RSTSYNC

LAN Reset/Sync: The LAN Connect component’s Reset and Sync signals are

multiplexed onto this pin.

82801DB Datasheet(PDF) 39 Page - Intel Corporation

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