Scoring the Routed Design

The SCORE FOR THIS DESIGN is a rating of the routed design. The PAR file (a portion of which is shown below) shows the total score as well as the individual factors making up the score. The score takes the following factors into account (weighted by their relative importance).

• The number of unrouted nets (unr)
  
  
• The number of timing constraints not met (ncst)
  
  
• The amount (expressed in ns) that the timing constraints were not met (acst)
  
  
• Maximum delay on a net with a weight greater than 3
  
  
• Net weights or priorities
  
  
• The average of all of the maximum delays on all nets (av)
  
  
• The average of the maximum delays for the ten highest delay nets (10w)
  
  

The lower the score, the better the result.

The formula that produces the score is

5000*unr + 1000*ncst + 20*acst + (delay*weight)*0.2 + av*100 + 10w*20

The score in the PAR Report is shown following.

NOTE

The PAR file is formatted for viewing in a monospace (non-proportional) font. If the text editor you use for viewing the report uses a proportional font, the columns in the report do not line up correctly.

The Delay Summary Report

The Score for this design is: 673


The Number of signals not completely routed for this design is: 0

The Average Connection Delay for this design is: 3.890 ns
The Average Connection Delay on critical nets is: 0.000 ns
The Average Clock Skew for this design is: 1.173 ns
The Maximum Pin Delay is: 22.769 ns
The Average Connection Delay on the 10 Worst Nets is: 14.210 ns

Listing Pin Delays by value: (ns)

d <= 10 < d <= 20 < d <= 30 < d <= 40 < d <= 50 d > 50
--------- --------- --------- --------- --------- ---------
750 39 4 0 0 0

Timing Score: 0

When a design has been routed to your satisfaction, you can use BitGen to produce a bitstream file.