A single chip processor suitable for various multimedia communication products has been developed. This chip achieves real-time bi-directional encoding/decoding for CIF resolution video at a frame rate of 30 fr/s, and meets such standards, as H.320 and H.324. The chip is composed of a video-processing unit for MPEG-4 and H.26X standards, a DSP unit for speech codec and multiplex processes, and a RISC unit for managing the whole chip. By heterogeneous multiple processor architecture, careful study of task sharing for each processing unit and bus configuration, a single chip solution can be achieved with reasonable operation speed and low-power consumption suitable for consumer products. Moreover, by applying an original video processing unit architecture, this chip achieves real-time bi-directional encoding/decoding for CIF-resolution video at a frame rate of 30 fr/s. An original video bus was developed to provide high performance and low-power consumption while sharing one external memory which is necessary for various video processes and graphics functions. This shared memory also has the effect of minimizing die size and I/O ports. This chip has been fabricated with 4-metal 0.18 µm CMOS technology to produce a chip area of 10.510.5 mm2 with 1.2 W power dissipation including I/O power, at 1.8 V for internal supply and 3.3 V for I/O power supply.