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CS4610-CM 数据表(PDF) 9 Page - Cirrus Logic

部件名 CS4610-CM
功能描述  CrystalClear SoundFusion PCI Audio Accelerator
Download  29 Pages
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制造商  CIRRUS [Cirrus Logic]
网页  http://www.cirrus.com
标志 CIRRUS - Cirrus Logic

CS4610-CM 数据表(HTML) 9 Page - Cirrus Logic

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DS241PP5
9
CS4610/11
CrystalClear™ SoundFusion™ PCI Audio Accelerator
OVERVIEW
The CS4610 and CS4611 are high performance au-
dio accelerator DSPs for the PCI bus. These devic-
es, combined with application and driver software,
provide a complete system solution for cost effec-
tive acceleration of Windows® DirectSound,
DirectSound3D, DirectInput, DirectShow, MIDI
playback via Wavetable Synthesis with reverbera-
tion and chorus effects processing, and more.
The CS4610 is a high-performance, full-featured
version of the SoundFusion audio accelerator. The
CS4611 is a reduced-cost version of the CS4610.
The CS4611 has a lower max clock speed and does
not support AC-3 or MPEG-2. Please refer to the
OEM Software Reference Manual for more details.
There are three main functional blocks within the
CS4610/11: the Stream Processor, the PCI Inter-
face, and the DMA Engine. The Stream Processor
(SP) is a high speed custom Digital Signal Proces-
sor (DSP) core designed by Cirrus Logic, Inc. spe-
cifically
for
audio
signal
processing.
This
extremely powerful DSP core is capable of running
complex algorithms such as Dolby Digital AC-3 or
MPEG-2 audio decoding for applications such as
DVD movie playback or gaming. The SP is capable
of running a number of different signal processing
algorithms simultaneously. This high concurrency
capability is valuable for applications such as immer-
sive 3D games, which may play a number of Direct-
Sound streams, a number of DirectSound3D streams,
and a MIDI music sequence simultaneously.
Separate RAM memories are included on-chip for
the SP program code (Program RAM), parameter
data (Parameter RAM), and audio sample data
(Sample RAM). A small ROM memory (Coeffi-
cient ROM) is included to store fixed coefficient
data required for the sample rate conversion and
audio decompression algorithms.
The
RAM-based
DSP
architecture
of
the
CS4610/11 ensures maximum system flexibility.
The software function/feature mix can be adapted
to meet the requirements of a variety of different
applications, such as DirectX™ games, DVD mov-
ie playback, or DOS applications. This RAM-based
architecture also provides a means for future sys-
tem upgrades, allowing the addition of new or up-
graded functionality through software updates.
The CS4610/11 provides an extremely efficient bus
mastering interface to the PCI bus. The PCI Inter-
face function allows economical burst mode trans-
fers of audio data between host system memory
buffers and the CS4610/11 device. Program code
and parameter data are also transferred to the
CS4610/11 over the PCI Interface.
The CS4610/11 DMA Engine provides dedicated
hardware to manage transfer of up to 96 concurrent
audio/data streams to and from host memory buff-
ers. The DMA Engine provides hardware scatter-
gather support, allowing simple buffer allocation
and management. This implementation improves
system efficiency by minimizing the number of
host interrupts.
The CS4610/11 supports a variety of audio I/O
configurations, including direct connection to the
CrystalClear CS423x Codecs or to an AC’97 Co-
dec such as the CrystalClear CS4297. The system’s
flexibility is further enhanced by the inclusion of
auxiliary ADC and DAC ports, a bi-directional se-
rial MIDI port, a joystick port, a hardware volume
control interface, and a serial data port which al-
lows connection of an optional external EEPROM
device.
The block diagram in Figure 6 depicts a mother-
board audio subsystem based on the CS4610/11
and the CS423x. This approach features the proven
ISA legacy support of the CS423x Codecs (which
include the CS423xB family as well as the CS4235
and CS4239 devices). The CS423x provides DOS
applications with hardware compatibility for the
Sound Blaster Pro™, OPL3, and MPU-401 register
sets. In this configuration, the CS423x also pro-
vides the system joystick interface. The CS423x


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