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LPC Connector
The Low Pin Count Interface was defined by Intel
sition towards legacy free systems. It allows the integration of low-bandwidth legacy I/O com-
ponents within the system, which are typically provided by a Super I/O controller. Furthermore,
it can be used to interface firmware hubs, Trusted Platform Module (TPM) devices and embed-
ded controller solutions. Data transfer on the LPC bus is implemented over a 4 bit serialized
data interface, which uses a 33MHz LPC bus clock. For more information about LPC bus refer
to the Intel
®
Low Pin Count Interface Specification Revision 1.1'. The table below indicates the
pin functions of the LPC connector.
Pin
Pin Assignment
1
CLK
3
RST#
FRAME#
5
LAD3
7
LAD2
9
SERIRQ
11
5VSB
13
Chapter 2 Hardware Installation
Chapter 2
14
13
LPC
1
2
Corporation to facilitate the industry's tran-
®
Pin
Pin Assignment
LAD1
2
LAD0
4
3V3
6
GND
8
---
10
GND
12
5V
14
Connecting the EXT-RS232/RS485 Card to the Motherboard
With DFI's proprietary technology, CS331-C246/Q370 supports two extension modules for ad-
ditional four COM ports. The EXT-RS232/RS485 card is connected to CS331-C246/Q370 via the
LPC connector. The illustrations below guide you how to connect the extension module to the
motherboard.
Note:
The system board used in the following illustrations may not resemble the actual one.
These illustrations are for reference only.
29
Top View
LPC
COM
Bottom View
LPC
EXT-RS485
EXT-RS485
DFI Motherboard
EXT-RS232/RS485
Additional 4 COM
www.dfi .com
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