2

PI293PP1 JUL ‘98

CS4622/24

Description

the CS4622/24 enables real mode DOS compatible PCI-only audio sub-

systems. This device, combined with application and driver software, provides

a complete system solution for hardware acceleration of Windows 95® Direct-

Sound®, DirectSound3D®, DirectInput, and Wavetable Synthesis. WDM

drivers provide support for both Windows 98 and Windows NT 5.0.

The CS4622/24 is based on the Cirrus Logic CrystalClear Stream Processor

(SP) DSP core. The SP core is optimized for digital audio processing, and is

powerful enough to handle complex signal processing tasks such as Dolby

Digital AC-3 decoding (CS4622 only) with ease. The SP core is supported by a

bus mastering PCI interface and a built-in dedicated DMA engine with hard-

ware scatter-gather support. These support functions ensure extremely efficient

transfer of audio data streams to and from host-based memory buffers, provid-

ing a system solution with maximum performance and minimal host CPU

loading.

The all-digital CS4622/24 supports a variety of audio I/O configurations

including direct connection to the CrystalClear CS4297 AC ‘97 Codec. A sec-

ondary AC ‘97 2.0 interface provides support for multi-channel and digital

docking solutions. Added extended I/O supports DAA control for modem

applications.

Consumer Digital input and output (S/PDIF) interfaces support both PCM and

compressed 5.1 digital data formats.

PC/PCI, DDMA, and CrystalClear Legacy support provide PCI-only legacy

games compatibility.

96-Stream

DMA Controller

with Hardware

Scatter/Gather

MPU-401

MIDI Interface

PCI

Interface

Joystick

Interface

PC/PCI &

CCLS Legacy

AC ’97 2.0

Interface

AC ’97 2.0

Interface

S/PDIF In

S/PDIF Out

ZV Port

Async. Modem

Interface

Program

ROM

Parameter

RAM

SLIMD

SP Core

Sample

RAM

Program

RAM

Coefficient

ROM

PCI Bus

4622-4pi.fm Page 2 Tuesday, July 7, 1998 1:21 PM