A micro-controller company has a single-cycle CPU model with a cycle time of 10ns. The company...

   

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A micro-controller company has a single-cycle CPU model with a cycle time of 10ns. The company decides to turn the single-cycle CPU into a faster 4-stage pipeline. Due to some practical design constraints, the engineers were unable to make the new pipeline balanced. Instead, three out of the four stages have identical latency; the latency of the remaining stage is 10% longer than the latency of the three other stages. a) [5 pts] What is the cycle time of the new pipeline? b) [5 pts] For typical programs with billions of instructions, what is the speedup of the new pipeline over the single-cycle CPU? Assume the idea case without pipeline hazards. A micro-controller company has a single-cycle CPU model with a cycle time of 10ns. The company decides to turn the single-cycle CPU into a faster 4-stage pipeline. Due to some practical design constraints, the engineers were unable to make the new pipeline balanced. Instead, three out of the four stages have identical latency; the latency of the remaining stage is 10% longer than the latency of the three other stages. a) [5 pts] What is the cycle time of the new pipeline? b) [5 pts] For typical programs with billions of instructions, what is the speedup of the new pipeline over the single-cycle CPU? Assume the idea case without pipeline hazards.

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