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To achieve high performance video coding and decoding, many hardware engines are integrated in the W9961CF, which perform Motion Estimation and Motion Compensation, Discrete Cosine Transform (DCT) and Inverse Discrete Cosine Transform (IDCT), Quatization and Inverse Quantization, Zig-zag Scan, Variable Length Encoding and Variable Length Decoding (VLD), etc. A high performance 16-bit RISC with 5Kx22 bits program memory (PM) and lKx16 bits data memory (DM) is also integrated for H.263/H.261 coding/decoding control and intelligent frame rate control. There are three picture formats supported by the W9961 encoder and decoder: sub-QCIF, QCIF, and CIF. The W9961CF, when operated at 70 Mhz clock frequency, is capable to encode/decode sub- QCIF, QCIF, or CIF at 30 fps.