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Question: 43 when processor designers consider a possible improvement to the...

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4.3. When processor designers consider a possible improvement to the processor datapath, the decision usually depends on the cost/performance trade-off Assume we start with datapath shown in the Figure where I-Mem, Add, Mux, ALU, Regs, D-Mem, and Control blocks have latencies of 400 ps, 100 ps, 30 ps, 120 ps, 200 ps, 350 ps, and 100 ps respectively; and costs of 1000, 30, 10, 100, 200, 2000, and 500 respectively Consider the addition of a multiplier to the ALU. This addition will add 300 ps to the latency of the ALU and will add a cost of 600 to the ALU. The result will be 5% fewer instructions executed since we no longer need to emulate the MUL instruction a. What is the clock cycle time with and without this improvement? b. What is the speedup achieved by adding this improvement? c. Compare the cost/performance ratio with and without this improvement. Branch 4 Add Add ALU operation Data Register Regis Register # Register # RegWrite MemWrite PC Address Instruction Registers ALU Data Instruction Data MemRead Control

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