SAA7780 datasheet(8/70 Pages) PHILIPS

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ThunderBird Q3D PCI Audio

SAA7780

Accelerator

Philips Semiconductors

Product Specification

1999 Sep 30

CD Quality Wavetable Synthesis with 320 Total Voices

ThunderBird Q3DTM includes two wavetable synthesis engines. When configured for wavetable synthesis only the

ActiMedia DSP can produce up to 64 wavetable 44KHz, 16 bit voices. Using the ActiMedia engine minimizes CPU

consumption and is ideal for games with MIDI music tracks. Also available is a professional quality soft-synth that can

produce up to 256 voices including special effects. The soft-synth is highly configurable and can be optimized for

highest quality with pure music applications or for minimum CPU consumption in gaming applications.

Both engines maximize quality and minimize cost by using system memory for wavetable sample sets and the

ActiMedia engine can be used to accelerate DirectMusic and DLS (Down Loadable Sound) sample sets using WDM

drivers.

ActiMedia DSP Architecture

The ActiMedia architecture combines the strengths of both programmable and fixed function DSP architectures. A

programmable DSP processor enables custom features, field up-grade and ease of development. An array of gate-

efficient fixed function DSP processors (accelerators) operate in parallel with the programmable DSP, providing an

extremely high performance-to-cost ratio. Unlike fixed-point DSP's that must use a single resolution for all audio

processing, each accelerator is designed with the optimum resolution for its function. This preserves the audio integrity

without the cost of a high-resolution or floating point programmable DSP implementation. The result is a performance,

quality and concurrency that requires 10 times the MIPS on a classical DSP architecture.

Digital Mode Dual Game Port

The S/W polling used by analog game ports can consume up to 10% of the host CPU. ThunderBird PCI products utilize

a digital operating mode that can eliminate S/W polling and accelerate the game port function resulting in significantly

improved system performance. Joystick buttons can be polled or interrupt driven to further enhance performance. A

default analog mode assures compatiblitiy with DOS and other non-DirectInputTM applications.

PCI Interface

The ThunderBird Q3DTM is a PCI 2.1 compliant multifunction device including audio, game port and 16650 UART

functions capable of bursting at 132 MB data rates. The high bandwidth and low latency of the PCI bus reduces the

need for host based processing and local memory. The PCI bus consumption of each audio stream is reduced by a

factor of 10 compared to ISA solutions. The PCI and CPU busses are no longer locked during slow ISA DMA

transactions and system performance is improved as much as 20%.

To maximize performance, the PCI interface includes dual 32 bit bus masters: DMA, DirectSound and wavetable

synthesis acceleration. A 16 bit DSP Master Device is used to transfer data directly between the host and DSP or AC97

interface. Additional slave devices support legacy and MIDI interfaces. All I/O is re-mappable creating a true "Plug and

Play" device.

Comprehensive Legacy Audio Support

SoundBlaster Pro compatibility in both Real Mode DOS and DOS windows is achieved through H/W SoundBlaster and

OPL 3 (FM) emulation registers. Legacy DMA over the PCI bus is supported on all major platforms utilizing PC/PCI,

DDMA, or VLSI's proprietary Legacy Accommodation ModeTM (LAMTM). DOS music synthesis includes stereo MIDI

playback, quad MIDI playback, and FM emulation.

Integrated I/O and Peripherals

ThunderBird Q3D products include all the required features to implement a PCI audio solution with minimal chip count.

I/O includes an AC97 link for a AC97 1.0 codec, stereo DAC serial port for multi-channel or low cost playback

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