Intel VC820 Design Guide - Page 23
Low Pin Count (LPC) Interface, a-d AC'97 Connections
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Introduction Figure 1-4. (a-d) AC'97 Connections a) AC'97 With Audio Codec ICH (241 mBGA) AC'97 Digital Link AC'97 Audio Codec b) AC'97 With Modem Codec ICH (241 mBGA) AC'97 Digital Link AC'97 Modem Codec Audio Ports Modem Port c) AC'97 With Audio/Modem Codec ICH (241 mBGA) AC'97 Digital Link AC'97 Audio/ Modem Codec d) AC'97 With Audio and Modem Codec ICH (241 mBGA) AC'97 Digital Link AC'97 Modem Codec AC'97 Audio Codec Modem Port Audio Ports Modem Port Audio Ports 1.4.7 Low Pin Count (LPC) Interface In the Intel® 820 chipset platform, the super I/O 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 a system 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 super I/O vendor for a comprehensive list of devices offered and features supported. In addition, depending on system requirements, a device bay controller and USB hub could be integrated into the LPC super I/O component. For systems requiring ISA support, an ISA-IRQ to serial-IRQ converter is required. Potentially, this converter could be integrated into the super I/O. Intel®820 Chipset Design Guide 1-11