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Forums > Digital IC > Floorplanning, Place and route

Subject: reporting multicut via
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mvvijay78
Posts: 11
Online: User is Offline
10/16/2007 2:20 AM  
Does any one know the command to dump out the number of multicut vias in a design using nanoroute (Encounter).
Kari
Posts: 81
Online: User is Offline
10/19/2007 12:44 PM  
You should see a couple of lines in the log like the following:

#Total number of vias = 1928911
#Total number of multi-cut vias = 918149 ( 47.6%)


- Kari
mvvijay78
Posts: 11
Online: User is Offline
10/21/2007 11:57 PM  
Thanks kari.Currently we are doing the same. We are looking into the log file of nanoroute to grep for the number of multicut vias .  But wanted to know if given a routed database is there any command which could dump out the same info.
rjkleinstick
Posts: 1
Online: User is Offline
11/01/2007 10:43 AM  
There's a gift script that comes with your FE install : userRptViaStats.tcl This dumps via counts to the cmd window for all vias individually (regular & special). You can source and run this as part of your batch run script, or in FE after restoring a routed db.
You could tweak the gift script a bit to get what you want.

Skip special nets so you don't get the power grid via arrays...
if [dbIsNetSpecial $netId] { puts "Skip Special Net: $netName"
....

Add some statements to get number of cuts in each via as it loops though the route segments...
set xCuts [lindex [dbInfoViaCellRegularCuts $viaPtr] 4]
set yCuts [lindex [dbInfoViaCellRegularCuts $viaPtr] 5]

Then only list the multi-cut vias...
if {$xCuts > 1 || $yCuts > 1} {
incr multCutViaCount
if [info exists viaList($viaName)] {
....

If you want the script output to go to both the command window and the log file, you need to change the "puts " to "Puts" (use Upper-case P)...
Puts "Total Multi-Cut Vias: $multiCutVias"

-Rich
eminemshow
Posts: 75
Online: User is Offline
11/02/2007 1:35 AM  
Thanks! Rich, your post indirectly helps me a lot!

I have been tried to find way to iterate all the vias in SOCE until the day I see your post.

Many thanks!!
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Forums > Digital IC > Floorplanning, Place and route > reporting multicut via


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