A computerconsists of a CPU and an I/O device D connected to main memory M via a

Question

A computerconsists of a CPU and an I/O device D connected to main memoryMvia

a shared buswith a data bus width of one word.The CPU can execute a maximumof

106instructions per second. An average instruction requires fiveprocessor cycles,

three of whichuse the memory bus. A memory read or write operation usesone

programs that require 95% of itsinstruction execution rate but not any I/Oinstructions.

Assume that one processor cycle equalsone bus cycle. Now suppose that very

large blocks of data are to betransferred between M andD.

a. Ifprogrammed I/O is used and each one-word I/O transfer requires theCPU to

execute two instructions, estimate themaximum I/O data transfer rate, in words

per second, possible throughD.

b.Estimate the same rate if DMAtransfer is used.

Explanation / Answer

Thank you so much

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