Question

Explain the validity of the statement

Only one clock cycle time is required to execute one insstruction in pipelined processor even if CPI is not 1

Comments

CPI in the case of pipelining is not always 1.

For example- If any phase of instructions takes more than 1 clock.

                    If there are dependencies among instructions and stalls are needed.

 

So not valid.

Answer 1

when u consider the average CPI it may be 1 or more as for the average some instructions can give rise to stalls and decrease the CPI..

Only one clock cycle time is required to execute one insstruction

No,if there are stalls it doesnot complete in one cycle...if all set of instructions gets executed without stalls then CPI=1 and they will complete in one cycle