Unfixable violations:
  A - There are available lib cells outside area limit
  C - The violation is in clock network
  D - Cell or net is located in high density area
  E - Physical information is incomplete or unavailable
  H - Logical and physical hierarchies are inconsistent
  I - Buffer insertion with given lib cells cannot fix the violation
  O - No open free site is available
  P - Driver cell of the violation is a port
  Q - Driver cell of the violation is a sequential cell
  R - No locations are available in parasitics or location transformation failed
  S - Cell sizing with alternative lib cells cannot fix the violation
  T - Timing margin is too tight to fix the violation
  V - Driver cell of the violation is dont_touched
  U - UPF restricts fixing the violation

  Violation                                                   Reasons
  ---------------------------------------------------------------------
  None

