82C931 Datasheet, PDF (11/64 Pages) List of Unclassifed Manufacturers – Plug and Play Integrated Audio Controller

82C931
2.0 Overview
The OPTi 82C931 is a single-chip Plug-and-Play audio sys-
tem controller and codec that provides compatibility with
Sound Blaster Pro™, Microsoft Windows Sound System™,
OPL3, and MPU-401 interfaces. The 82C931 integrates a 16-
bit stereo sigma-delta codec and PC-97 compliant internal
resource structure. This provides an effective audio solution
for Windows 95 operating systems, DirectSound™, and
advanced audio applications.
The 82C931 provides front panel push-button volume control,
external modem chip interface, serial EEPROM for further
customizing, support for 16-bit Type F DMA playback and an
I²S serial interface to a Zoom Video Port, wavetable control-
ler, or modem chipset.
The 82C931 includes the following functions: ISA bus inter-
face, Sound Blaster Pro-compatible Digital Audio Processor,
MIDI interface, Windows Sound System interface, FM syn-
thesizer interface, 16-bit codec/mixer, game port timer, and
IDE CD-ROM interface. The device also includes dual DMA
channels that support full duplex operation for simultaneous
record and playback, a silence mode, power-down modes,
and software programmable interrupts. (Figure 2-1 shows a
functional block diagram of the 82C931. Figure 2-2 shows the
82C931 data flow block diagram.)
The 82C931 Integrated Audio Controller provides all of the
functions and interfaces for Sound Blaster Pro-compatible
and Microsoft Windows Sound System-compatible cards.
The 82C931 is intended to provide an integrated audio solu-
tion for business audio, educational/entertainment sound,
and multimedia applications.
Figure 2-1 Functional Block Diagram
IOW#
IOR#
AEN
RESET
OSCI
SA[15:0]
SD[15:0] or SD[7:0]
SDHOE+GPIO0
DACK0#/1#/3#
DACK5#/6#
DRQ0/1/3
IRQ3/4/5/7/9/10/11/15
GD[7:0]
OSCI
OSCO
MICL/R
AUXL/R
CDL/R
LINEL/R
OUTL/R
MIXOUTL/R
VOLUP
VOLDWN
SADI
SADO
SCLK
FSYNC
ISA
Control
CLK
GEN
WSS CONF
REGS REGS
Digital
Audio
Processor
8/16-bit Type
DMA Logic
Interrupt
Game Port Timer
16-bit Sigma-Delta
Codec/Mixer
Volume Control
I²S Serial Audio Port
FIFO
MIDI
FIFO
UART
OPTiFM
CD-ROM
Interface
Modem Interface
RXD
TXD
CA[2:0]
IDECS1#
IDECS3#
CDOE#
CDHOE#
XIOR#
XIOW#
RESET#
IDEIRQ
MODEMINT
MODEMCS#
912-3000-035
Revision: 2.1
OPTi
®
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