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I do not clearly understand what do you mean by "statastics".When you run global detail route you have the information on tracks and Gcell usage.Here is the example snippet.
Resource Analysis:## Routing #Avail #Track #Total %Gcell# Layer Direction Track Blocked Gcell Blocked# --------------------------------------------------------------# Metal 1 H 7607 9692 1336335 62.57%# Metal 2 H 7507 9792 1336335 55.84%# Metal 3 V 7636 9663 1336335 59.51%# Metal 4 H 8609 8691 1336335 52.02%# Metal 5 V 5747 11551 1336335 56.39%# Metal 6 H 5400 11899 1336335 55.09%# Metal 7 V 1831 2486 1336335 55.30%# Metal 8 H 2415 1903 1336335 43.85%# --------------------------------------------------------------# Total 46753 56.99% 10690680 55.07%## 589 nets (0.47%) with 1 preferred extra spacing.
Do elaborate if you are looking for something else, would try to help.
Hope this helps.
In reply to vishnu:
I need to obtain a histogram with congestion ratio on the x-axis and the number of nets with that much congestion in the y-axis. as shown below
In order to obtain this congestion map, I use the command,
dumpCongestArea -all <filename>
The file obtained gives me, the count of remaining tracks and total tracks of all cells. Example data shown below.
Area Density remain/total tracks---------------------------------------------------(0, 0) (15800, 16000) V: 19/20 H: 19/20(15800, 0) (30400, 16000) V: 17/18 H: 18/20(30400, 0) (34400, 16000) V: 5/5 H: 18/20
I import this into a spreadsheet program and compute the congestion ratio as,
congestion ratio = (Total tracks - remain tracks)/Total tracks
From the values of congestion ratio, I obtain the histogram that was shown above.
My problem is, this data obtained from dumpCongestArea is got after trialRoute. (dumpNanoCongestArea gives data after global route)
But I need to draw a similar histogram after the detailed routing is complete. For this, I need information about the utilised to total tracks ratio(after detailed routing)
P.S:Also, I am trying to create a congested design, so that I can try tweaking the schematic and reduce the congestion. As a result, I have overflow after global routing, which is getting removed after detailed routing. So I am interested in the Congestion data after detailed routing.
In reply to Narasimhan:
If you stop after iteration zero, you will have a db with more congestion for your analysis:
You will notice a difference in the output if you allow detailRoute to clean up the violations in the design.
In reply to Eric Despain: