Duplicate Combinatorial Logic

O1

I1

O1

I1

N1

N1 must go to two places, so O1 may require a second level of logic

Duplicating first gate allows N1A to always be collapsed inside a single lookup table

N1A

N1B

• The M1 tools will duplicate combinatorial logic automatically if Logic Replication is selected

• Collapsing logic into CLBs lowers the number of levels

• The gates you use will determine mapping

  • Nets with a fanout ɭ may be outside a CLB
  • Pay attention to mapping of speed-critical paths

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