High-throughput Binary Arithmetic Encoder architecture for CABAC in H.265/HEVC

Context adaptive binary arithmetic coding (CABAC) is the entropy coding tool applied in the latest video coding standard, High Efficiency Video Coding (H.265/HEVC). CABAC achieves high coding efficiency but involves the bin-to-bin data dependency of Binary Arithmetic Encoder (BAE). This paper proposes a range updating structure with pre-bitwise-NOT (PBN) operation to shorten the critical paths in the range updating stage of the BAE, and also proposes a BAE architecture with optimized Lookahead rLPS. Synthesized results in SMIC 40nm show that the proposed architecture can operate at 436.7MHz and the throughput is 1777Mbin/s.