[PCB_FORUM] Re: Pin swapping

Tim,
you can swap only two pins if you have separate resistors in a network package to preserve your netlist (unless it is a network with a common pin), although you can swap 2-pin gates (resistors) within one package and between packages. For separate resistors in Rpack you should create homogeneous package containing N gates, each gate should have the same SWAP_ID to allow pin swapping of a single resistor. Resistors (gates) with the same properties are swappable between packages in Allegro (15.7). To block it you can use NO_SWAP_GATE_EXT property. If you want to swap between packages with controlling groups of RPacks between which you can exchange gates then a unique property should be added to isolate RPacks of the same type but related to different parts of a design.
For a resistor network with a common pin I think it is possible to swap pins between packages only if you draw an Orcad symbol as a set of separate single pin resistors (plus a separate symbol of a common pin) and to perform gate swapping of them between packages in Allegro. Personally I wouldn't do it because it will be easy to create a design error if for instance a common pin of two packages is at a different potential. I don't know a method of pin swapping (not gate swapping) between packages but anyhow it doesn't sound as a correct operation for me. 

good luck,
Robert



Paul Gingras wrote:
Group, 

  We are trying to come up with an easy way to swap pins between several
resistor network packages. So far we can swap pins within the packages
themselves, but not amongst the other packages. One thing that should work
is to make every individual pin a function, but that is a lot of work for
the engineer. There should be a way to define the library part to be
swapable and place several of them in the schematic and then swap them at
the allegro level. This is basic CAD functionality that has been around
since the early CAD tools of the 70's.

We are using Orcad version 15.7  with Allegro 15.5

Thanks,

  Tim Schillberg
KAW/USa


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