Prorating Constraints

• The tools will allow the user to prorate timing delay characteristics based on known environmental parameters. This is available only in the XC4000XL family.

• Voltage: Allows the user to specify the operating voltage.

  UCF syntax: VOLTAGE = value [units]
  

• Temperature: Allows the user to specify the operating temperature.

  UCF syntax: TEMPERATURE = value [C|F|K] Celsius is the default.
  

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