82C931 Datasheet, PDF (3/64 Pages) List of Unclassifed Manufacturers – Plug and Play Integrated Audio Controller

Table of Contents
82C931
1.0 Features ............................................................................................................................ 1
2.0 Overview ........................................................................................................................... 3
3.0 Signal Definitions ............................................................................................................. 5
3.1 Mode Selection ................................................................................................................................... 5
3.2 931-MB Mode....................................................................................................................................... 6
3.2.1 931-MB Mode Signal Descriptions ......................................................................................... 8
3.2.1.1 ISA Bus Interface Signals ....................................................................................... 8
3.2.1.2 MIDI Interface Signals............................................................................................. 8
3.2.1.3 Configuration and External PnP EEPROM Interface Signals ................................. 9
3.2.1.4 Game Port and Serial Audio Interface Signals ....................................................... 9
3.2.1.5 Codec/Mixer Interface Signals ..............................................................................10
3.2.1.6 Power and Ground Pins ........................................................................................11
3.3 931-AD Mode .....................................................................................................................................12
3.3.1
931-AD Mode Signal Descriptions........................................................................................14
3.3.1.1 ISA Bus Signals ....................................................................................................14
3.3.1.2 MIDI Interface Signals...........................................................................................14
3.3.1.3 Configuration, External PnP EEPROM, and IDE CD-ROM Interface Signals.......15
3.3.1.4 Game Port and Modem Interface Signals .............................................................16
3.3.1.5 Codec/Mixer Interface Signals ..............................................................................16
3.3.1.6 Serial Audio Interface Signals ...............................................................................17
3.3.1.7 Power and Ground Pins ........................................................................................17
4.0 Functional Description .................................................................................................. 19
4.1 Plug and Play ....................................................................................................................................19
4.2 16-Bit Codec/Mixer ...........................................................................................................................20
4.2.1 Codec ...................................................................................................................................20
4.2.2 Mixer.....................................................................................................................................21
4.3 Frequency Synthesizer ....................................................................................................................22
4.4 16-Bit Type F DMA Playback ...........................................................................................................23
4.5 Modem Interface ...............................................................................................................................23
4.6 Push Button Volume Control...........................................................................................................23
4.7 External Serial EEPROM ..................................................................................................................23
4.8 Serial Audio Interface .......................................................................................................................23
4.8.1 I2S-justified format and its variations....................................................................................23
4.8.2 Sony format ..........................................................................................................................24
912-3000-035
Revision: 2.1
OPTi
®
Page iii