82801BA Datasheet, PDF (37/498 Pages) Intel Corporation – Intel 82801BA I/O Controller Hub 2 (ICH2) and Intel 82801BAM I/O Controller Hub 2 Mobile

Signal Description
Signal Description
2
2.1
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.
Hub Interface to Host Controller
Table 2-1. Hub Interface Signals
Name
Type
Description
HL[11:0]
HL_STB
HL_STB#
HLCOMP
I/O Hub Interface Signals
I/O
Hub Interface Strobe: One of two differential strobe signals used to transmit and
receive data through the hub interface.
I/O
Hub Interface Strobe Complement: Second of the two differential strobe
signals.
I/O Hub Interface Compensation: Used for hub interface buffer compensation.
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
Description
I
LAN Interface Clock: This signal is driven by the LAN Connect component. The
frequency range is 0.8 MHz to 50 MHz.
Received Data: The LAN Connect component uses these signals to transfer
I data and control information to the integrated LAN Controller. These signals have
integrated weak pull-up resistors.
O
Transmit Data: The integrated LAN Controller uses these signals to transfer
data and control information to the LAN Connect component.
O
LAN Reset/Sync: The LAN Connect component’s Reset and Sync signals are
multiplexed onto this pin.
82801BA ICH2 and 82801BAM ICH2-M Datasheet
2-1