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Chapter 2 Hardware Installation
Chapter 2
LPC Connector
The Low Pin Count Interface was defi ned by Intel
®
Corporation to facilitate the industry’s transition
towards legacy free systems. It allows the integration of low-bandwidth legacy I/O components
within the system, which are typically provided by a Super I/O controller. Furthermore, it can be
used to interface fi rmware hubs, Trusted Platform Module (TPM) devices and embedded control-
ler solutions. Data transfer on the LPC bus is implemented over a 4 bit serialized data interface,
which uses a 24MHz LPC bus clock. For more information about LPC bus refer to the Intel
®
Low
Pin Count Interface Specifi cation Revision 1.1’. The table below indicates the pin fuctions of the
LPC connector.
LPC
3
1
2
13
14
Pin
Pin Assignment
Pin
Pin Assignment
1
CLK_24M
2
LAD1
3
RST#
4
LAD0
5
FRAME#
6
VCC3
7
LAD3
8
GND
9
LAD2
10
---
11
SERIRQ
12
GND
13
5VSB
14
5V
Standby Power LED
This LED will lit red when the system is in the standby mode. It indicates that there is power
on the system board. Power-off the PC and then unplug the power cord prior to installing any
devices. Failure to do so will cause severe damage to the motherboard and components.
Standby Power LED
3
