CM8828 骅讯PCI Express多通道音频处理器

　　Description and Overview

　　The Oxygen Express™ HD CM8828is a high quality PCI express multi-channel audio processor that not only an Intel HD Audio specification compatible audio single chip, but also can be a controller which can connect HDA codec. CM8828 can be built in the home audio electronics or personal computer to provide high fidelity sound and become a professional audio processing center in your life. It supports up to 10 outgoing channels and 6 ingoing channels. The 10 outgoing channels are composed of 2 playback DMA's, which are multi-channel DMA (24 bits, 8 channels, 192k), Headphone out & S/PDIF DMA (each 24 bits, 2 channels, 192k). The 6 ingoing channels are spread in3 recording DMA's (up to 24 bits, 192k).

　　The Oxygen Express™ HD CM8828is a MCU-based audio processor which can co-work with all the usual HDA codecs. The audio topology for HDA spec. can be flexible by only changing the Firmware. This ability gives customers the flexibility to design their products. The HDA-Link, 2-wire master bus, and SPI interfaces are used to transfer audio data and control data between the CM8828and codecs. To facilitate the connection with the existing home audio electronics, the CM8828 has incorporated the S/PDIF transmitter with 192k sampling rate in it.

　　Amaster I2C interface is built in to connect with the serial EEPROM to store and retrieve the non-evaporable data for firmware code and the customer applications, such as board configuration, sub-vender and sub-system IDs, or any dynamic data that customers want to save for the next power-on to restore.

　　The Oxygen Express™ HD CM8828 has an independent 2-wire slave bus to communicate with micro control unit (MCU). Strictly speaking, this interface is used as a media for system driver and MCU to talk. There are nine GPIOs pins, which can be used to distinguish if a device is plugged in the phone jack or other purpose.