gEDA-user: Slots, Swaps and BSDL files

[John Eaton <z3qmtr45@xxxxxxxxx>]

   > Pinlabel is for humans, and for hierarchy. Pinseq is a unique
   > numerical identifier for the "pin", independent of the footprint if
   > any (not all symbols correspond to parts with footprints).
   >
   So slotting lets the PCB designer exchange one 2 input Nand gate for
   another in the same or different package. Swapping lets them swap
   the two inputs pins. How does the pinseq number do both at the same
   time?
   Pin labels are also for test. Each chip has a BSDL file that describes
   it's test
   logic by pin label name. This file is used to generate the test
   vectors. You
   need to create a netlist showing the components and pinlabels so that
   you
   can make the connections. This means that one file tells you that
   U1.FOO
   to signal BIG_FOO and all its other connections including TP_34.
   Another
   file gives you the X-Y location for TP_34 for the test fixture.


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