ESS Maestro2 free download

File name ESSmaestro2.pdf

PRELIMINARY Maestro-2TM PCI Audio Accelerator Product Brief DESCRIPTION The Maestro-2TM audio digital accelerator is a highly integrated PCI audio solution that brings advanced audio features to notebook computers. These features include a 64-voice wavetable synthesizer with Downloadable Sample (DLS) and complete DirectSoundTM support. The Maestro-2 proprietary technology supports both Microsoft®'s PC97 logo requirements and DOS game compatibility. The Maestro-2 device works with any AC'97 compliant CODEC including ESS Technology's own PT-101 AC'97-link CODEC. A secondary AC'97 CODEC interface supports an additional CODEC. Support for a DumbarTM bridge docking solution for the secondary CODEC interface is planned for Q4 of 1997. The Maestro-2 communicates with a Dumbar bridge through a "super AC-link". This link carries both PCM audio data and data for nonCODEC related data; i.e. game port, MPU-401, GPI/O, etc. The dual audio-engine Maestro-2 architecture consists of a 64voice, pipelined, wavetable synthesizer and a proprietary audio signal processor. Together they can simultaneously handle multiple audio streams of different data types, high-quality MIDI synthesis, and voice compression and decompression. Each channel/stream has an independent pan, tremolo, vibrato and tone filter. The synthesizer also performs advanced audio effects such as reverb, chorus, flange, echo and 3-D spatial enhancement. WaveCacheTM technology reduces the system cost by storing data (synth samples, WAV files, algorithms) in host memory. The data is retrieved using high-performance PCI bus cycles during playback or recording. Microsoft's DirectSound API is accelerated by digitally mixing up to 32 PCM streams of any frequency down to a single output stream of 48 kHz. This "final" buffer can then be piped to any CODEC (through the two attached AC'97 IF, 1394, USB) available to the system. This acceleration frees up the CPU to perform other tasks. The Maestro-2 audio accelerator supports a number of different legacy audio schemes, including Distributed DMA protocol, PC/ PCI DMA, Compaq® style one-signal SERIRQ#, and Transparent DMA. This ensures complete DOS game compatibility. The Maestro-2 power management complies with both Advanced Configuration and Power Interface (ACPI) 1.0 and Advanced Power Management (APM) rev. 1.2. The Maestro-2 audio accelerator is available in an industrystandard 100-pin Thin Quad Flat Package (TQFP). FEATURES W W W W W 64-voice wavetable synthesizer supporting DLS and 32 independent digital data streams Proprietary WaveCacheTM Technology 3-D positional audio under DirectXTM 5.0 Enhanced effects (reverb, chorus, echo, vibrato, etc.) AC-3 decode acceleration ­ External DSP for hardware AC-3 decode ­ Active Movie AC-3 filter acceleration option W W W W W W W W W W 2- or 3-button hardware master volume control I2S/Zoom Video support AC'97 CODEC interface Up to 20-bit ADC/DAC audio resolution Complies with Microsoft's ACPI rev 1.0 (D0~D3) &