CS4231A Datasheet, PDF (62/76 Pages) List of Unclassifed Manufacturers – PARALLEL INTERFACE MULTIMEDIA AUDIO CODEC

CDB4231/4248
The Crystal Windows 3.1 software (version
1.04) supports a "generic hardware" switch that
forces the software to use the DMA and IRQ set-
tings in the SYSTEM.INI file and assume no
Auto-Select register exists. With this switch on,
all combinations of DMA and IRQ, supported by
the hardware, are allowed. To use this option, the
SYSTEM.INI file must contain:
[CSBusAud]
GenericHardware=On
; either On or Off
; Off is default
This switch is added to the SYSTEM.INI file by
the installation software when the "Generic
Hardware" option is selected from the Windows
Sound System screen.
WSS SOFTWARE COMPATIBILITY
The CS4231/4248 is compatible with Microsoft
Windows Sound System software (version 2.0)
with respect to wave audio data support. Since
the evaluation board does not contain a synthe-
sizer, the MIDI portion of WSS will not
function. When installing the Microsoft software,
select Custom Installation and set the base ad-
dress, IRQ, and DMA channel consistent with
the evaluation board jumper settings. Since the
board does not contain the extra hardware
needed for software configuration of the IRQ
and DMA channel, the Auto Installation mode of
the Microsoft WSS software is not supported.
The Microsoft WSS hardware and software driv-
ers do not use all the analog inputs. The only
hardware supported by the Microsoft WSS hard-
ware and software are a mono microphone input
(set jumper on J35 to M), and the stereo Line
input jack, Line I.
CRYSTAL ENHANCED WSS 2.0 DRIVERS
Crystal also provides enhanced Windows Sound
System drivers that support software written to
the Windows Sound System standard. These
drivers, currently version 1.0, were designed to
support the CRD4231 reference design, but will
also support the CDB4231. When using the En-
hanced WSS 2.0 drivers, the following settings
in the SYSTEM.INI file must be set to:
OldMSDosGameCompatibility=0
BlasterSupport=SWEmulation
Msft Hardware=0
Auto Select=0
Midi Play=0
SCHEMATICS
The following pages contain the full schematics
for the CDB4231/4248, the PLD equations, and
layout plots of each PCB layer.
Windows and Windows Sound System are registered trademarks of Microsoft Corporation
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