User's Manual

2
1. Description
The ES1989 Allegro PCI audio accelerator is a highly integrated PCI
solution for the multimedia PC. The high bandwidth PCI bus is utilized to deliver
advanced PC audio features, such as DirectSound acceleration and HRTF3-D
positional audio.
The ES1989 implements multi-stream DirectSound and DirectSound3D
acceleration with digital mixing, sample rate conversion, and HRTF 3-D filtering.
It includes a programmable audio digital signal processor and provides
simultaneous support for multiple audio streams. With its built-in DSP core, the
ES1989 uses its dedicated DMA engine to handle complex signal processing
tasks with a bus-mastering PCI interface.
1.1 Features
l High-performance single-chip PCI audio acceleration.
l Integrated high-fidelity AC‘97 codec.
l Multi-stream DirectSound and DirectSound 3D acceleration.
l Sensaura CRL Positional 3D.
l High-quality sample rate conversion and digital mixing.
l DirectMusic support.
l Real-time effects processing.
l S/PDIF output for DVD content.(Optional)
l Full legacy DOS game support using PC/PCI, DDMA or TDMA
hardware implementation methods (Optional).
l Compliance with APM 1.2, ACPI 1.1, and PPMI 1.1
l 3.3 volt digital operation with 5V-tolerant inputs.
l Compliant with PCI 2.1/2.2 PCI specification.
l SoundBlaster® and SoundBlaster® Pro compatible.
l Microsoft® Windows Sound System compatible.