Pipeline and Vector Processing Q.13

13Consider an instruction pipeline with four stages (S1, S2, S3 and S4) each with combinational circuit only. The pipeline registers are required between each stage and at the end of the last stage. Delays for the stages and for the pipeline registers are as given in the figure.

pipelining

What is the approximate speed up of the pipeline in steady state under ideal conditions when compated to the corresponding non-pipeline implementation?

Option : B
Explanation : Pipeline registers overhead is not counted in normal time execution
So the total count will be
5 + 6 + 11 + 8 = 30 [without pipeline]
Now, for pipeline, each stage will be of 11 n-sec (+ 1 n-sec for overhead).
and, in steady state output is produced after every pipeline cycle. Here, in this case 11 n-sec. After adding 1n-sec overhead, We will get 12 n-sec of constant output producing cycle.
dividing 30/12 we get 2.5

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