- + Issue 923: (1) Section 8.4.4.1 and Annex F - Discipline Resolution: No clear definition on how to deal with "leaf

[Jon Sanders, 1/22/2001]

  (1) Section 8.4.4.1 and Annex F - Discipline Resolution: No clear definition on how to deal with "leaf
     level" wires.
  
   
   Leaf level wires (net segments) are primarily the result of alias modules used in netlisters and pass through's as a result of
   synthesis. These wires (net segments) have no components connected to them at the specified hierarchy thus the only
   connections to this wire (net segment) are higher in the hierarchy.
   While in the detail resolution the discipline is and can be passed down into this net segment if needed the same is not true
   for the default method. In default all disciplines are passed up the hierarchy but these net segments may not have a
   discipline to pass up.
   
     Recommendation: The default method needs to have additional clarification that this special cases must resolve their
     discipline by looking up the hierarchy until a discipline can be defined. If two or more ports are connected to this leaf
     level wire that would pass down a different discipline the basic rules apply, disciplines must be compatible and continuous
     wins over discrete. Cadence will provide the update for section 8.4 and the Annex