[理工] 計組 Datapath 求 min. cycle time

看板Grad-ProbAsk作者n810516 (Nick)時間12年前 (2014/01/20 22:55)推噓4(4推 0噓 11→)

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Assume that logic blocks needed to implement the datapath have the following latencies: (Delay for other components are ignored.) I-Mem Add Mux ALU Regs D-Mem Sign-extend Shift-left-2 400ps 100ps 40ps 120ps 200ps 350ps 20ps 10ps 答案是 1310 = 400 + 200 + 120 + 350 + 40 + 200 這題 Regs 前面的 Mux 不需要算進去可以理解，因為後面才會用到但下面這題 Assume the following table shows energy consumption for some components. You can assume that the other components of the datapah spend a negligible amount of energy. How much energy is spent to execute an lw instruction in a single-cycle design. I-Mem Mux ALU Regs D-Mem Sign-extend 200pJ 30pJ 100pJ 150pJ 250pJ 50pJ 我算 990 = 200 + 30 + 150 + 50 + 30 + 100 + 250 + 30 + 150 解答 960 = 200 + 150 + 50 + 30 + 100 + 250 + 30 + 150 想問為什麼 Regs 前面的 Mux 不用算？跟室友討論不出結果，所以上來請教板友，麻煩了 -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 36.231.100.151

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