cpu - Which one is right one in pipelining? -


i'm studying cpu pipelining, , had trouble.
want know 1 right pipelining in below picture
in opinion, first gantt chart kinda "structural hazard" becuase "if" stage partially overlapped. think using 1 stage 2 instruction not allowed. think second 1 right....
right?

enter image description here

you right.

the first chart has 2 instructions being fetched during second cycle. unless specified otherwise, cannot done.

there circumstances in allowable:

  • the instruction fetch divided 2 stages, if1 , if2, each of take 1 cycle. if1 , if2 can overlapped.
  • the data path , instruction cache support 2 simultaneous operations.

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