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Re: gEDA-user: 1-to-many pin mapping between gschem ->pcb ???

Greg,

PCB will let you declare two pins to have the same number. You could have a land pattern

as such

Element(0x00000000 "" "D1" "" 1800 1050 56 -138 0 100 0x00000000)
(
   Pin(0    0  70   70 80 40      "1" "1" 0x00000001)
   Pin(100    0 70    70 80 40  "1" "1" 0x00000001)
   Pin(0 -300 70  70 80 40      "2" "2" 0x00000001)
   Pin(100 -300 70 70 80 40   "2" "2" 0x00000001)
   )



Ales Hvezda wrote:

[ Ales here, I'm reposting this since majordomo didn't recognize the
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[ Hi Greg, you are subscribed as "greg.cunningham AT crafty.homelinux.net",
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-- Cut here --
Date: Mon, 02 May 2005 21:21:25 +1000
From: Greg Cunningham <greg@xxxxxxxxxxxxxxxxxxxx>
Reply-To: greg.cunningham@xxxxxxxxxxxxxxxxxxxx

I'm sure people must run up against this, but I can't see the problem
discussed in the archive...  am I blind?

A gschem fuse symbol is a 2-node object. If I assign the footprint
"fuseL", PCB connects the 2 rats to the same end of the fuse. "fuseL"
is a 4-pin device & the rats are assigned to pins 1 & 2, but pads 1&2
belong to the same metal fuse clip. 

I fixed my 1st pcb attempt in Emacs by changing fuseL pin 2->4 in the
net, and adding a pin 2 (clone of pin 1)& pin 3 (clone of pin 4) in the
nets.  Now the rats correctly connected to each end of the fuse & also
connected both pads of each fuse clip.

What is the correct way to fix this?  Surely users must be faced with
the situation where a logical connection on a symbol maps to more than 1
pin on a physical element.  The desired outcome is a rat that connects
to each physical pin.

I could alter the fuseL element pins viz:
2 -> 4
4 -> 3
3 -> 2
The rat would now connect correctly to each end of the fuse, but would
only connect to 1 pad, not both.