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Copyright Cirrus Logic, Inc. 1998
(All Rights Reserved)
CrystalClearTM
SoundFusionTM PCI
Audio Accelerator
The following information is based on the
technical datasheet:
CS4622/24 DS293PP2 JUN '98
Preliminary Product Bulletin
Please contact Cirrus Logic, Multimedia
Audio support for further information.
CS4622/24
PI293PP1 JUL `98
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PI293PP1 JUL `98
1
CS4622/24
Features
CrystalClear
TM
SoundFusion
TM
PCI Audio Accelerator
Features
q
300/255 MIPs SLIMD
TM
DSP Architecture
q
DirectX
TM
5.0 3D Positional Audio
q
Fat Labs
Approved 64-Voice Wavetable Synthesis with Effects
q
NetMeeting
TM
AEC Hardware Acceleration
q
Dolby
Digital AC-3
(CS4622)
q
High Quality Hardware Sample Rate Conversion (90+ dB
Dynamic Range)
q
PC/PCI Legacy Support
q
DDMA Legacy Support
q
CrystalClear Legacy Support (CCLS
TM
)
q
PCI 2.1 Compliant PCI Interface
q
96 Stream DMA Interface with Hardware Scatter/Gather
Support
q
PCI Power Management (D0 through D3 Hot), APM 1.2, and
ACPI 1.0 Support
q
AC `97 2.0 Link Codec Interface
q
Secondary AC `97 1.0/2.0 Link Codec Interface for Multi-
Channel and Digital Docking Support
q
Asynchronous Digital Serial Interface (ZV Port)
q
S/PDIF Digital Input and Output Interfaces supporting both
PCM and Dolby
Digital 5.1 Formats
q
MPU-401 MIDI Input/Output Interface
q
3.3 V Power Supply (5 V tolerant I/O)
Description
The CS4622/24 is a high performance pin-compatible upgrade to the 128-pin
CS4610C PCI audio accelerator. With the added legacy compatibility modes,
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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
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PI293PP1 JUL `98
3
CS4622/24
Overview
Overview
The CS4622/24 is a high performance audio accelerator DSP for the PCI bus.
This device, combined with application and driver software, provides a com-
plete system solution for cost effective acceleration of Windows DirectSound,
Direct-Sound3D, DirectInput, MIDI playback via Wavetable Synthesis with
reverberation and chorus effects processing, and more. The CS4622/24 is com-
patible with the CS4610C with the following added features:
- Primary AC `97 Interface now 2.0 compatible
- 2
nd
AC `97 Interface (also 2.0 compliant)
- CrystalClear Legacy Support
- PC/PCI Legacy Support
- DDMA Legacy Support
- PCI Power Management Event Support
- ZV Port Asynchronous Serial Port
- 2nd Asynchronous Serial Port
- 9 Extended GPIO pins for Modem Support
- Consumer Digital (S/PDIF) Input and Output
The CS4622 is a high-performance, full-featured version of the SoundFusion
audio accelerator. The CS4624 is a reduced-cost version of the CS4622. The
CS4624 has a lower maximum clock speed and does not support AC-3. Please
refer to the OEM Software Reference Manual for more details.
FAQs
1)
What is the difference between the two devices?
A:
The CS4622 offers the capability to decode Dolby Digital (AC3), and the
CS4624 does not.
2)
How is the Dolby License obtained?
A:
Cirrus Logic can only ship devices and software implementing Dolby
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4
PI293PP1 JUL `98
CS4622/24
Ordering Information
technology to Dolby certified customers. A Dolby System License certi-
fication can be obtained by faxing a written request to Dolby Licensing
Corporation, at (415) 863-1373. This request should include a description
of the intended application and should be marked "Request for Dolby
License Application".
3)
How are these devices different than the other Crystal PCI audio products
(CS4280 and CS4614)?
A:
The CS4280 does not offer DSP acceleration for wavetable synthesis and
3D sound, using the host processor instead. The CS4614 offers DSP pro-
cessing, but not digital I/O (SPDIF) or ZVPort support.
4)
Which markets would the CS4622 and CS4624 serve?
A:
Manufacturers of PC motherboards, portables, and PCI audio cards
would use the CS4622 and CS4624, where the performance advantages
of DSP processing are desired along with the digital input/output to con-
nect to high-end audio devices . The DSP processor is used for hardware
wavetable synthesis and 3D audio acceleration for the games/multimedia
market, and acoustic echo cancellation for speakerphone/ videoconfer-
encing in the commercial market.
Ordering Information
CS4622-CQ
128-pin TQFP
20x14x1.60 mm
CS4624-CQ
128-pin TQFP
20x14x1.60 mm
If you have any questions, please contact the undersigned by phone or by
email. Also, visit our website
"www.cirrus.com" or call our litera-
ture department (800) 888-5016 ext.
3594 or (512) 912-3594 for data
sheets and application notes.
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