Constraint Recommendations

• Do not use the same TIMESPEC name for more than one path

• Keep constraints in one source

  • Either UCF file or in schematics, but not both

• Avoid OVER-constraining the design

  • Design Performance suffers
    • Critical timing paths get the best placement and fastest routing options
    • As the number of critical paths increases, routability decreases
  • Run times increase
  • The appendix shows ways to avoid over-constraining

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