Design of Bypassing Mechanism of RISC/DSP Processor

For a kind of RISC/DSP architecture processor:MediaDSP3201(MD32,for short),a distributed bypassing unit strategy is proposed.The strategy adopts an effective mechanism to avoid unnecessary pipeline stall.A bypassing circuit chain model is used to realize the proposed strategy in MD32.A circuit optimization method for DBPU is used to avoid pipeline stage delay,so as to improve the overall performance for the processor.Finally,MPEG decoding program is taken as an example to show the improvement of the processor performance by reducing the CPI value:36% compared to centralized method,and the hardw are cost (accounting for 3.7% of the processor resources) is small.