Processor and Chipset
Intel® SHG2 DP Server Board Technical Product Specification
Intel Order Number C11343-001
Revision 1.0
14
2.5 Chipset Support Components
2.5.1
Legacy I/O (Super I/O) National* PC87417VLA
The National* PC87417VLA is integrated on the SHG2 baseboard as the Super I/O controller
(SIO). The SIO is a Plug and Play-compatible device with ACPI-compliant controller/extender.
The SIO provides support for the following features:
•
The system real-time clock (RTC)
•
Two serial ports
•
One parallel port
•
Floppy disk controller
•
PS/2-compatible keyboard and mouse controller
•
Gereral purpose I/O (GPIO) pins
•
Plug and Play functions
•
Power management controller
The SHG2 baseboard provides the connector interface for the floppy, dual serial ports, parallel
port, PS/2 mouse, and the PS/2 keyboard. See Section 8 (Connections) for connector pinout
information. Upon reset, the SIO reads the values on GPO pins to determine its boot-up
address configuration.
2.5.1.1 Serial
Ports
One 9-pin connector in a D-Sub housing is provided for serial port A, while serial port B is
optional via cable to the rear of the chassis through a 9-pin connector.
Both ports are
compatible with 16450 and 16550A modes, and both are re-locatable.
Each serial port can be
set to one of four different COM-x ports, and each can be enabled separately.
When enabled,
each port can be programmed to generate edge- or level-sensitive interrupts.
When disabled,
serial port interrupts are available to add-in cards. The serial port pinout is shown in
Table 3
.
Table 3. Serial Port Connector Pinout
Pin
Name
Description
1
DCD
Data Carrier Detected
2 RXD
Receive
Data
3 TXD
Transmit
Data
4
DTR
Data Terminal Ready
5 GND
Ground
6
DSR
Data Set Ready
7
RTS
Request to Send
8
CTS
Clear to Send
9
RIA
Ring Indication Active