Following describing the system ' s organisation , we discuss the design and implementation of the system in detail including data paths , alu . to design the control paths , we start with the analysis of mcs51 instruction set , and then discuss the instruction execution procedure instruction and operation , and schedule of instruction timing Risc51ipcore控制通路的重點(diǎn)是兼容mcs51單片機(jī)指令系統(tǒng)的設(shè)計(jì)與實(shí)現(xiàn),本論文從mcs51指令系統(tǒng)的分析入手,詳細(xì)討論了指令的執(zhí)行流程、內(nèi)部指令和操作的設(shè)置、指令的時(shí)序安排的設(shè)計(jì)與實(shí)現(xiàn)。