Abstract: This paper presented the study of a multiple thread mechanism in YHFT_Matrix high performance DSP．It emphatically introduced the read and write mechanism of the loop instruction buffer and the mode switch mechanism between single_threaded and multithreaded．Based on the 65nm process,after being synthesized,both the code area and power consumption have been decreased,and the key path optimizes 0.07ns.The implementation of the program assessment test was analyzed,and the outcome shows that compared with the operation mode of single_threaded,the processor performance IPC(Instructions Per Cycle) has an average increasing of 9.64%.

Key words: Multiple thread,Loop instruction buffer,Mode switch