以下有三題簡答題，請問有沒有高手可以幫忙解一下!感謝!!!!! 1.Pipelining is often explained using some illustration similar to the diagram below, which illustrates a four-stage instruction pipeline. Can you devise an illustration, based on the same notion, to demonstrate the operation of a 3-way superscalar(four-stage) instruction pipeline at its maximum efficiency. What is the maximum possible performance gain over the basic pipeline structure? [圖] TIME---------------------------> IF ID EX WB IF ID EX WB IF ID EX WB IF ID EX WB (我想問的是，通常在一個機器週期下，一個指令會被分為下列五個步驟來執行 IF-ID-EX-MEM-WB，可是在這個圖裡少了MEM，所以這個題目是不是要我舉個只有四個步驟 的基本管線結構的最大可能表現獲取?) 2.A basic time model that is widely used in evaluating processor is clocks per instrction(CPI). A processor has two classes of instructions: class A instructions take two clocks to execute whereas class B instuctions take three clocks to execute. Of all the instruction execute, 75% are class A instructions and 25% are class B instructions. What is the CPI of this processor? 3.A multiplattered hard disk is divided into 40 sectors and 400 cylinders. There are four platter surfaces. The total capacity of the disk is 128MB. A cluster consists of 4 sectors. The disk is rotating at a rate of 5400 rpm. The disk has an average seek time of 12 msec. (A)What is the capacity of a cluster for this disk? (B)What is the average access time before starting data transfer? (C)What is the maximal disk transfer rate in bytes per second? (請問這第三題要怎麼算?) --

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