High-performance inverse transform circuit based on butterfly architecture for H.264 high profile decoder

This paper proposes the high-performance architecture of unified inverse transform circuit for H.264/AVC high profile decoder. Four processing elements operate in parallel to achieve the high performance. Two-stage pipeline technique is applied in each processing element. All inverse transforms required in H.264/AVC high profile decoding are covered by the proposed circuit. Our circuit consists of 29,731 gates and its maximum operation frequency is 107MHz when synthesized using 130nm standard cell library.