nc pins

Question

hello 
 
 i have many nc pins (non connect pins) on the design that someone made. 
 
 many of those nc pins are connected to gnd physically but the design shows no error. 
 
 is there a way to show an error where nc pins are connected to gnd or some other nets? 
 
 regards 
 masa

DavidJHutchins · Accepted Answer

I wrote a simple Allegro SKILL check routine shown below: <<< procedure((Check_Nc_Pins) let((net_cnt err_cnt Fp Class SubClass) (net_cnt = 0) (err_cnt = 0) foreach(net ((axlDBGetDesign)->nets) net_cnt++ foreach(branch (net->branches) foreach(child (branch->children) if((child->objType) then if(((child->objType) == "pin") then (Fp = car(child->functionPins)) when((Fp->use == "NC") err_cnt++ (SubClass = cadr(parseString(car(child->startEnd) "/"))) (Class = upperCase(sprintf(nil "DRC ERROR CLASS/%s" SubClass))) (SubClass = sprintf(nil "NC_pin on %s" net->name)) (axlDBCreateExternalDRC SubClass (child->xy) Class child nil nil) ) ) ) ) ) ) (axlMsgPut "%d nets processed, %d DRC flags added" net_cnt err_cnt) ) ) >>>> Below is the journal file entry when running it: \i (00:00:29) skill Check_Nc_Pins (00:00:29) 565 nets processed, 5 DRC flags added (00:00:29) t \i (00:00:46) browse drcs

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