The CS8406 is a monolithic CMOS device which encodes and transmits audio data according to the AES3, IEC60958, S/PDIF, or EIAJ CP1201. The CS8406 accepts audio and digital data, which is then multiplexed, encoded and driven onto a cable. The audio data is input through a configurable, 3-wire input port. The channel status and user bit data are input through an SPI or IC microcontroller port, and may be assembled in block sized buffers. For systems with no microcontroller, a stand alone mode allows direct access to channel status and user bit data pins. Target applications include A/V Receivers, CD-R, DVD receivers, digital mixing consoles, effects processors, set-top boxes, and computer and automotive audio systems.