Re: [理工] 計組 Datapath 求 min. cycle time

看板Grad-ProbAsk作者weichen8157 (wei)時間10年前 (2014/01/26 19:55)推噓4(4推 0噓 4→)

留言8則, 4人參與討論串2/2 (看更多)

※ 引述《n810516 (Nick)》之銘言： : 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，麻煩了雖然回文已經有人說張凡答案改給990 但我還是不能同意為什麼沒把pcsrc的mux消耗的功率算進去我算1020…求大大解惑手機排版抱歉 -- Sent from my Android -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 114.33.50.151

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h56999

01/28 09:43, , 1^F

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