82801DB Datasheet, PDF (39/587 Pages) Intel Corporation – Intel 82801DB I/O Controller Hub 4 (ICH4)

Signal Description
2.1
Hub Interface to Host Controller
Table 2-1. Hub Interface Signals
Name
HI[11:0]
HI_STB /
HI_STBS
HI_STB# /
HI_STBF
HICOMP
Type
I/O
I/O
I/O
I/O
Description
Hub Interface Signals
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.
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.
Hub Interface Compensation: Used for hub interface buffer compensation.
Hub Interface Voltage Swing: Analog input used to control the voltage swing
and impedance strength of hub interface pins.
HI_VSWING
I
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.
2.2
Link to LAN Connect
Table 2-2. LAN Connect Interface Signals
Name
LAN_CLK
LAN_RXD[2:0]
LAN_TXD[2:0]
LAN_RSTSYNC
Type
I
I
O
O
Description
LAN I/F Clock: Driven by the LAN Connect component. Frequency range is
5 MHz to 50 MHz.
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.
Transmit Data: The integrated LAN controller uses these signals to transfer
data and control information to the LAN Connect component.
LAN Reset/Sync: The LAN Connect component’s Reset and Sync signals are
multiplexed onto this pin.
Intel^® 82801DB ICH4 Datasheet
39