CM8888数据手册Cmedia中文资料规格书

描述 Description

The Oxygen Express™-series HD CM8888 is a high- quality PCI Express multi-channel audio processor with an Intel HD Audio specification-compatible audio chip. It is also a controller that can link HDA codecs or bridge high-quality I2S codecs. The CM8888 can be built into home audio electronics or personal computers to provide high-fidelity sound, providing a professional audio processing center.
It supports up to 14 outgoing channels and 12 ingoing channels. The 14 outgoing channels are composed of 4 playback DMA’s, including a multi-channel DMA (32 bits, 8 channels, 192k), a S/PDIF & HDMI DMA (each 32 bits, 2 channels, 192k), and a RTC (real-time communication) DMA (32 bits, 2 channels, 192k) channels. The 12 ingoing channels are spread out in 3 recording DMAs (up to 32 bits, 192k).

特性 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

●Audio I/O
 ·Intel HD Audio Link supports 1 external HDA codec
·Six pairs of I2S serial audio output interfaces (12-ch out)
·Six pairs of I2S serial audio input interfaces (12-ch in)
·Integrated 192K/176.4K/96K/88.2K/48K/44.1K, and 16/24/32-bit S/PDIF transmitter with a 2-source selector/mux (from playback DMA digital mixing, S/PDIF input), including WMA-Pro output support
·Integrated 192K/176.4K/96K/88.2K/48K/44.1K, and 16/24/32-bit S/PDIF receiver with 2-input internal selector/switch for media center/AV receiver features
·Built-in MPU-401 MIDI UART I/O port for pro audio applications
·All input data can be mixed to output streams for low-latency record monitoring/mixing output

●Control Interfaces
·SPI control interfaces with up to 8 external audio devices (5 output devices and 3 input devices)
·I2C Interface supports both master and slave modes (master for external audio devices and slave for additional MCU applications such as remote controls)
·Interrupt pin for external MCU read transaction
·Serial EEPROM programming interface for customizing sub-vendor and sub-device IDs (and vendor/device IDs as well), storing HDA power-on pin configuration data (replacing the MB BIOS function) and 8051 ROM codes (HDA command transcoder
·Maximum 8 jack-detection pins (5 for output jacks and 3 for input jacks)
·Maximum 16 GPIO pins for external devices control and other purposes
·LED indicator control pin functions while protected content is playing

●General
·24.576MHz crystal input required with embedded PLL for adaptive clock rate
·Single 3.3V power supply
·3.3 V digital I/O pads with 5V tolerance
·Fully compatible with all mainstream southbridges (Intel, nVIDIA, VIA, SiS)
·LQFP-128 package
·Default target codecs: CM9882A for HDA; CS5381 (ADC)+PCM1795(DAC) for I2S
·Support Xear™ technology by Cmedia vendor driver