ES1373

ENSONIQ AudioPCI™ 97 ES1373 Specification PRELIMINARY 1. INTRODUCTION AudioPCI 97 is the new ENSONIQ AC97 digital controller which provides the next generation of audio performance to the PC market. AudioPCI 97 is a 5.0 Volt PCI bus compatible device that enables the ENSONIQ SoundScape PCI solution. AudioPCI 97 along with an AC97 CODEC offer the next generation of audio performance in a PC while maintaining full legacy compatibility without old ISA bus solutions. Some of the capabilities of AudioPCI 97 are: SoundScape WaveTable synthesizer . Full DOS Game Compatibility Multiple sample rate support PCI Bus Master for fast DMA Sounds are stored in Main memory. Access to Ensoniq’s World Famous Sound Library of over 4000 Sounds 3 Stereo inputs and 3 mono inputs can be mixed into the output stream. Direct I/O space access of the control registers. 100 Pin PQFP {rectangular} Digital I/O compatible with consumer mode S/PDIF (out) or I2S (in) No ISA bus pins required Fully Compliant with PC97 Power Management specification 2. DESIGN CONCEPT AudioPCI 97 is a PCI bus master and slave device that is best understood by looking at the device as four interactive subsystems: the PCI interface, DMA control, LEGACY functions, and the CODEC. 2.1. PCI Interface The PCI subsystem is a bus master interface that performs the memory accesses to keep the Audio cache buffers full and empties the A/D Converter (or I2S input) buffer to main memory as required. The fundamental c...