指令数据通路划分 IF:Instruction fetch ID:Instruction decode/ EX:Execute/ MEM:Memory access WB:Write back register file read address calculation Add ADD Sum Sh准 left 1 0 Read M Read PC Address register 1 d归ta1 Zero Read ALU register 2 ALU Ad划ess Instructon result Read Registers data Write Read M Data M Instruction register d由ta2 memory u memory Write data Write data 32 64 imm Gen 图4-3112 指令数据通路划分 图4-31