memory复用：IF/MM,IR=MDR? Data Instruction Register# PC Address Instruction ALUOut Address register Registers Instruction Register# Memory memory Data Register# memory data register Data Instruction register PC Address Data Instruction Register ALU● ALUOut Memory or data Registers Register Memory Data data Register register FIGURE e4.5.1,The high-level viewmemory复用：IF/MM，IR=MDR？ FIGURE e4.5.1，The high-level view