DESCRIPTION

The CMI8788 is compatible with all the popular

codecs, from I2S codecs with over 120dB quality to

the usual AC97 codecs. This ability gives customers

the flexibility to design their products exactly the

way they want them. The I2S, AC-Link, 2-wire

master bus, and SPI interfaces are used to transfer

audio data and control data between the CMI8788

and codecs. To facilitate the connection with

existing home audio electronics, the CMI8788 has

incorporated the S/PDIF transmitter and receiver

with 192k sampling rate. An EEPROM interface is

built for the CMI8788 in connection with the

EEPROM to store and retrieve the non-evaporable

data for customer applications, such as board

configuration, sub-vendor and sub-system IDs of

the PCI configuration, or any dynamic data that

customers want to restore at the next power-on.

FEATURES

 PCI 2.2 interface with bus mastering and burst

modes

 Only one 24.576MHz oscillator is needed

 4 synchronous I2S output data stream pairs

within 1 flexible output DMA

 Programmable channel routing mechanism

among the 4 I2S output pairs

 4 synchronous I2S input data stream pairs spread

in 3 input DMA’s (for Dolby pro-audio

applications)

 DTS® Interactive – a real-time 5.1 channel

encoder that takes 2 or more channels and

encodes them into a DTS bit stream.

 DTS® NeoPC - an up-mix matrix that turns any 2

channel audio into 7.1 channel surround sound

 Dolby® Digital Live (AC-3) real-time 5.1 channel

encoding bit-stream to facilitate the connection

with CE AV receiver

2 Features

2.1 Hardware Features

 PCI 2.2 interface with bus mastering and burst modes

 Only one 24.576MHz oscillator is needed

 4 synchronous I2S output data stream pairs within 1 flexible output DMA

 Programmable channel routing mechanism among the 4 I2S output pairs

 4 synchronous I2S input data stream pairs spread in 3 input DMA’s (for Dolby pro-audio applications)

 Optionally, a multi-channel AC-link can support 2 AC97 codecs 8 channel DAC output with 16 bit

resolution

 Programmable HW monitoring routing from I2S inputs to outputs

 All I2S I/O pairs support 32-bit PCM data transfer and adjustable sample rate (up to 192KHz)

 Integrated 192k/24-bit S/PDIF transmitter with 1 dedicated S/PDIF OUT DMA

 Integrated 192k/24-bit S/PDIF receiver in recording DMA

 S/PDIF IN supports digital loopback path for switching between optical and RCA connections

 48k/16-bit front panel DMA for AC97 codec

 2-wire master serial bus or 4-wire SPI (Serial Peripheral Interface) bus to control I2S codecs

 2-wire slave serial bus to communicate with microcontroller unit (MCU)

 Interrupt pin to inform external MCU to retrieve the data from the system driver

 One MPU-401 MIDI UART port

 EEPROM control interface

 6 GPI phone jack detection pins

 Advanced device-sensing technology indicates whether a speaker or a headphone is plugged in the

jack

 9 direct-access GPIO pins

 3 bonding-option bits for 8 identification possibilities

 128-pin LQFP thin high-quality package

2.2 Software Features

 DTS® Interactive – a real-time 5.1 channel encoder that takes 2 or more channels and encodes

them into a DTS bit stream.

 DTS® NeoPC - an up-mix matrix that turns any 2 channel audio into 7.1 channel surround sound

 Dolby® Digital Live (AC-3) real-time 5.1 channel encoding bit-stream to facilitate the connection

with CE AV receiver

 Dolby® Pro-Logic IIx surround processor, spreading stereo audio into 7.1 channel surround sound

 Renowned Dolby® Headphone technology, conveying 5.1 surround and 3D gaming audio over stereo

headphones

 The latest Dolby® Virtual Speaker solution, creating amazing virtual surround sound from a generic

two-speaker configuration

 C-Media FlexBassTM – configurable LFE channel crossover frequency (from 50 to 250Hz)

 C-Media Magic VoiceTM, a popular feature for disguising voice in online chatting

 C-Media Xear 3D™ 7.1 Virtual Speaker Shifter technology

 C-Media’s unique Karaoke functions: Microphone Echo, Key-shifting

 Individual 10-band EQ for each channel

 27 global reverberation environments

 Supports most industrial standards of 3D sound for PC gaming, including EAX™ 1.0&2.0, A3D™ 1.0,

and DirectSound™

 Support 7.1 CH digital audio playback for WinXP, WinXP64, 2K, ME, 98SE (Microsoft® DirectX V.9.0

and above is required)

 ASIO function support

 Linux driver available (without Dolby® and DTS® technologies)

3 Applications

 Pro-sumer high-quality PCI sound card for retailer market

 Consumer sound card powered by Dolby® and DTS® technologies

 PC-based media center

 Professional PC musician application

 High-end motherboard requiring top audio quality

 Audio up-sell for PC systems

 Bundle selling with high-profile VGA cards

 General purpose multi-channel I/O