Answers Database

M1.3/M1.4 PAR: The signal "GLOBAL_LOGIC0" is not completely routed--messages about unrouted nets that are not in the input design


Record #2783

Problem Title:
M1.3/M1.4 PAR:  The signal "GLOBAL_LOGIC0" is not completely
routed--messages about unrouted nets that are not in the input design



Problem Description:
Keywords:  unrouted

Urgency: standard

General Description:
PAR may issue a message about unrouted nets that do not
appear to have been part of the user's input design.


Solution 1:

In some cases, if the message looks something like this:

//////////////////////////////////////////////////////////////

   Dumping design to file "drink_top_r.ncd".
   Total CPU time 22 secs
   Total REAL time: 2 mins 41 secs
   End of route.  169 routed (97.69%); 0 unrouted active,
      4 unrouted pwr/gnd.
   No errors found.
   The signal "GLOBAL_LOGIC0" is not completely routed.

//////////////////////////////////////////////////////////////


This is followed further down in the report by:

//////////////////////////////////////////////////////////////

   Total REAL time to Router completion: 2 mins 47 secs
   Total CPU time to Router completion: 23 secs

   Generating PAR statistics.

      The Delay Summary Report

      The Score for this design is: 544


   The Number of signals not completely routed for this design is: 1

      The Average Connection Delay for this design is:		       3.706 ns
      The Average Connection Delay on critical nets is:       0.000 ns
      The Average Clock Skew for this design is:	      0.033 ns
      The Maximum Pin Delay is: 			     11.991 ns
      The Average Connection Delay on the 10 Worst Nets is:   8.691 ns

      Listing Pin Delays by value: (ns)

    d <= 10    < d <= 20   < d <= 30   < d <= 40   < d <= 50	d > 50
   ---------   ---------   ---------   ---------   ---------   ---------
	 157	      12	   0	       0	   0	       0



  Timing Score: 0

  Dumping design to file "drink_top_r.ncd".


   1 signals are not completely routed.

   WARNING:baspw:130 - Design is not completely routed.

//////////////////////////////////////////////////////////////


The unrouted nets may actually be global VCC and GND nets,
particularly those that are named "GLOBAL_LOGIC".  The M1
tools will generate GLOBAL_LOGIC names for global VCC and
GND nets.  In this example, "GLOBAL_LOGIC0" refers to a
global ground net.



End of Record #2783