CS4614 datasheet(9/24 Pages) CIRRUS

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CIRRUS LOGIC PRELIMINARY PRODUCT BULLETIN JUNE 30, 5:03 PM

CS4614

CrystalClear™ SoundFusion™ PCI Audio Accelerator

OVERVIEW

The CS4614 is a high performance audio accelera-

tor DSP for the PCI bus. This device, combined

with application and driver software, provides a

complete system solution for cost effective acceler-

ation of Windows DirectSound, Direct-Sound3D,

DirectInput, MIDI playback via Wavetable Syn-

thesis with reverberation and chorus effects pro-

cessing, and more. The CS4614 is compatible with

the CS4610/11 with the following added features:

• AC ‘97 Interface now 2.0 compatible

• CrystalClear Legacy Support

• PC/PCI Legacy Support

• DDMA Legacy Support

There are three main functional blocks within the

CS4614: the Stream Processor, the PCI Interface,

and the DMA Engine. A block diagram of the

CS4614 device is shown in Figure 6.

The Stream Processor (SP) is a high speed custom

Digital Signal Processor (DSP) core specifically

designed for audio signal processing. The Stream

Processor is capable of running a number of differ-

ent signal processing algorithms simultaneously.

This high concurrency capability is valuable for ap-

plications such as immersive 3D games, which may

play a number of DirectSound streams, a number of

DirectSound3D streams, and a MIDI music se-

quence simultaneously.

Separate RAM memories are included on-chip for

the SP program code (PROGRAM RAM), param-

eter data (PARAMETER RAM), and audio sample

data (SAMPLE RAM). Two ROM memories store

coefficients for sample rate conversion and audio

decompression algorithms (COEFFICIENT ROM)

and common algorithm code (PROGRAM ROM).

The RAM-based DSP architecture of the CS4614

ensures maximum system flexibility. The software

function/feature mix can be adapted to meet the re-

quirements of a variety of different applications,

such as DirectX™ games or DOS applications.

This RAM-based architecture also provides a

means for future system upgrades, allowing the ad-

dition of new or upgraded functionality through

software updates.

The CS4614 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 CS4614 device. Program code and

parameter data are also transferred to the CS4614

over the PCI interface.

The DMA Engine provides dedicated hardware to

manage transfer of up to 96 concurrent audio/data

streams to and from host memory buffers. The

DMA Engine provides hardware scatter-gather

support, allowing simple buffer allocation and

96-Stream

DMA Controller

with Hardware

Scatter/Gather

MPU-401

MIDI Interface

Program

ROM

Parameter

RAM

PCI

Interface

Joystick

Interface

SLIMD

SP Core

PC/PCI &

CCLS Legacy

AC ’97 2.0

Interface

GPIO

PLL Clock

Sample

RAM

Program

RAM

Coefficient

ROM

Figure 6. CS4614 Block Diagram

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