We propose a full hardwired context-based adaptive binary arithmetic encoder for H.264/AVC. Our architecture includes a 14-way context pair generator, a 3-stage pipelined circuit for getting neighboring data and a 4-stage pipelined multiple-mode arithmetic encoder. The context pair generator is composed of binarization and context modeling and it can operate with arithmetic encoder concurrently. The arithmetic encoder can process one bin per cycle. Our whole CABAC encoder is able to process 0.67 bins per cycle on the average. Its performance is adequate for 1080 p (HDTV) resolution at 30 fps when running at 60 MHz.