CS4610-CM データシートの表示（PDF） - Cirrus Logic

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CS4610-CM

CrystalClear™ SoundFusion™ PCI Audio Accelerator

Cirrus Logic 

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

DS241PP5

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