Low-Pin-Count (Lpc) Interface - Intel 815EG Design Manual

Introduction
1.4.3.10

Low-Pin-Count (LPC) Interface

In the 815EG chipset platform, the Super I/O (SIO) component has migrated to the Low-Pin-
Count (LPC) interface. Migration to the LPC interface allows for lower-cost Super I/O designs.
The LPC Super I/O component requires the same feature set as traditional Super I/O components.
It should include a keyboard and mouse controller, floppy disk controller, and serial and parallel
ports. In addition to the Super I/O features, an integrated game port is recommended because the
AC '97 interface does not provide support for a game port. In systems with ISA audio, the game
port typically existed on the audio card. The fifteen-pin game port connector provides for two
joysticks and a two-wire MPU-401 MIDI interface. Consult your preferred Super I/O vendor for a
comprehensive list of the devices offered and the features supported.
In addition, depending on system requirements, specific system I/O requirements may be
integrated into the LPC Super I/O. For example, a USB hub may be integrated to connect to the
ICH2 USB output and extend it to multiple USB connectors. Other SIO integration targets include
a device bay controller or an ISA-IRQ-to-serial-IRQ converter to support a PCI-to-ISA bridge.
Contact your Super I/O vendor to ensure the availability of desired LPC Super I/O features.
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Intel 815EG Chipset Platform Design Guide
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