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Course: Computer Architecture (Theme: Input-Output) A computer consists of a processor and an I/O device D connected...

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Programming

Course: Computer Architecture (Theme: Input-Output)

  1. A computer consists of a processor and an I/O device Dconnected to main memory M via a shared bus with a data bus widthof one word. The processor can execute a max of 2 MIPS. An averageinstruction requires 5 machine cycles, 3 of which use the memorybus. A memory read/write operation uses 1 m/c cycle. Suppose thatthe processor is continuously executing “background” programs thatrequire 96% of the instruction rate but not any I/O instructions.Assume that one processor cycle equals one bus cycle. Now supposethe I/O device is used to transfer very large amounts of databetween M and D.
    1. If programmed I/O is used and each one word transfer requiresthe processor to execute 3 instructions, estimate the max I/O datatransfer rate in words/sec possible through D?
    2. Estimate the same rate if DMA is used?

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Solution A It is given that the processor requires 96 of the CPU time and during this time no IO operations are performed Therefore the processor can only devote 4 ie 4100 004 of its time to IO Also it is    See Answer
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