CM8888 Datasheet, PDF (5/25 Pages) California Micro Devices Corp – CMOS INTEGRATED DTMF TRANCEIVER

Oxygen^TM Express-series CM8888
High-Performance PCI Express Audio Processor
2 Features
Bus
 Compatible with PCI Express 1.1 interface, with bus mastering and burst modes
Architecture
 Embedded 8051-based MCU transcodes HD Audio commands to link various external I2S codecs
(external 4 or 8KB serial EEPROM is required)
 Embedded ROM code for MCU transcoding of HD Audio commands for embedded DACs and ADCs
 Built-in HD Audio and I2S controllers offer flexibility in choosing external codecs for different product
applications
 Digital mixer to mix all input data to output streams
DMA Controller
 Four playback DMAs and three recording DMAs that support MS Vista/Win7 HD Audio controller
requirements, and are WaveRT-port-friendly:
 Cyclic DMA engine with a scatter/gather list
 Position register is separate from other hardware registers (can be a copy)
 Ability to loop on buffers without software intervention
 Playback DMA#A supports up to 8-ch audio output (2/4/6/8-ch configurable by SW driver control)
 Playback DMA#B supports independent 2-ch audio output (e.g. front headphone out for RTC)
 Playback DMA#C supports independent 2-ch audio output (e.g. back headphone out) or S/PDIF for
HDMI output
 Playback DMA#D supports independent 2-ch audio output (for S/PDIF output or other purposes)
 Recording DMA#A supports up to 8-ch audio input (2/4/6/8-ch configurable by SW driver control)
 Recording DMA#B supports independent 2-ch audio input (for RTC headsets)
 Recording DMA#C supports independent 2-ch audio input (for S/PDIF input stream or other purposes)
 Sampling rates: all DMA channels support 192K/176.4K/96K/88.2K/48K/44.1K PCM data
 Resolution (Word-length): all DMA channels support 16/24/32-bit PCM data transfer modes
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