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Mail Archives: geda-user/2012/05/24/04:37:47

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Message-ID: <4FBDF333.3030106@innocent.com>
Date: Thu, 24 May 2012 04:37:07 -0400
From: Gus Fantanas <fantanas AT innocent DOT com>
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To: geda-user AT delorie DOT com
Subject: [geda-user] Hidden Nets and Slots
Reply-To: geda-user AT delorie DOT com

I am using a modified QFN16_EP footprint (QFN16 with pad).  I modified 
the QFN_EP footprint that came with the gEDA library so that the pad is 
not absolutely square, enabling me to rotate the whole footprint without 
trouble (this avoids the well-known PCB problem with rotation).  The way 
I have created this footprint the pad shows up as pin 17.

I am using a slotted symbol for the HFA3127 transistor array (QFN16).  
The symbol has five slots, but did not mention the pad (pin 17) 
initially.   In PCB, after importing the netlist, I connected the pad to 
a ground plane with nine thermal vias.  PCB warned me that pin 17 was 
shorted to ground.  I tried entering 'net = GND :17' statement in the 
symbol, but gschem claimed it read some garbage in the symbol for the 
HFA3127.  I even listed pin 17 in each slot, but still gschem claimed it 
read some garbage in the same symbol.

I can certainly live with PCB's warning about the "short" between the 
pad and ground, but I would like to make it go away.  Since my schematic 
is cluttered, I do not want to bring pin 17 into every slot.  It seems 
that gschem's documentation on the 'net' feature (at least the one I 
accessed) is ancient and perhaps out of date.  Can anybody shed some 
light about how to use hidden pins in symbols with slots?

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