CS4614-CM Просмотр технического описания (PDF) - Cirrus Logic
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CS4614-CM Datasheet PDF : 24 Pages
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CS4614
CrystalClear™ SoundFusion™ PCI Audio Accelerator
PCI
Interface
96-Stream
DMA Controller
with Hardware
Scatter/Gather
PC/PCI &
CCLS Legacy
MPU-401
MIDI Interface
Joystick
Interface
Parameter
RAM
Sample
RAM
Program SLIMD
RAM SP Core
Program
ROM
Coefficient
ROM
AC ’97 2.0
Interface
GPIO
PLL Clock
Figure 6. CS4614 Block Diagram
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
DS292PP3
CIRRUS LOGIC PRELIMINARY PRODUCT BULLETIN JUNE 30, 5:03 PM
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