The CXD3204R is an LSI integrating Link Layer and Physical Layer conforming to the IEEE1394-1995 serial bus standard on a single chip. Link Layer provides MPEG2 transpor t stream dedicated input interface and output interface, IEC958 audio stream I/O interface and output interface for D/A c o nve r t e r a s a d a t a i n t e r fa c e fo i s o c h r o n o u s communication. Also, a maximum 512 bytes of asynchronous communication is possible. Physical Layer provides two poarts for 1394 cable i n t e r fa c e , a n d s u p p o r t s t r a n s fe r s p e e d o f 200/100Mbit/s. Also, this layer provides received packet data regeneration repeat function, arbitration function and bus initialization logic.