
Intel
82801BA ICH2 Datasheet
2-1
Signal Description
Signal Description
2
This chapter provides a detailed description of each signal. The signals are arranged in functional
groups according to their associated interface.
The “#” symbol at the end of the signal name indicates that the active, or asserted state occurs when
the signal is at a low voltage level. When “#” is not present, the signal is asserted when at the high
voltage level.
The following notations are used to describe the signal type:
I
Input Pin
O
Output Pin
OD
Open Drain Output Pin.
I/O
Bi-directional Input / Output Pin.
2.1
Hub Interface to Host Controller
2.2
Link to LAN Connect
Table 2-1. Hub Interface Signals
Name
Type
Description
HL[11:0]
I/O
Hub Interface Signals
HL_STB
I/O
Hub Interface Strobe:
One of two differential strobe signals used to transmit and
receive data through the hub interface.
HL_STB#
I/O
Hub Interface Strobe Complement:
Second of the two differential strobe
signals.
HLCOMP
I/O
Hub Interface Compensation:
Used for hub interface buffer compensation.
Table 2-2. LAN Connect Interface Signals
Name
Type
Description
LAN_CLK
I
LAN Interface Clock:
This signal is driven by the LAN Connect component. The
frequency range is 0.8 MHz to 50 MHz.
LAN_RXD[2:0]
I
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]
O
Transmit Data
: The integrated LAN Controller uses these signals to transfer
data and control information to the LAN Connect component.
LAN_RSTSYNC
O
LAN Reset/Sync:
The LAN Connect component’s Reset and Sync signals are
multiplexed onto this pin.
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