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gEDA-user: Question about gschem DRC errors when using separate power pin symbols.

Hi,

I'm puzzled by a couple of gschem DRC errors I'm getting.

I'm using Stefan Salewski's quad comparator symbol with the separate
power pins symbol. I have four comparators plus the power pin symbol
all with the refdes of U1. All symbols are given an SO14.fp footprint.

When I run:

   gnetlist -g drc2 hv-psu_090608.sch -o drc_output.txt

I get errors.

Here's the message:

---------------
gEDA/gnetlist version 1.4.0.20080127
gEDA/gnetlist comes with ABSOLUTELY NO WARRANTY; see COPYING for more details.
This is free software, and you are welcome to redistribute it under certain
conditions; please see the COPYING file for more details.

Remember to check that your schematic has no errors using the drc2 backend.
You can do it running 'gnetlist -g drc2 your_schematic.sch -o drc_output.txt'
and seeing the contents of the file drc_output.txt.

Loading schematic [/home/andyfierman/gaf/projects/hv-psu/RC1/hv-psu_090608.sch]
DRC errors found. See output file.
---------------

and when I check the output file (drc_output.txt), I can see that the
errors are due to the duplicate reference to U1.

---------------
Checking non-numbered parts...

Checking duplicated references...
ERROR: Duplicated reference U1.

Checking nets with only one connection...

Checking pins without the 'pintype' attribute...

Checking type of pins connected to a net...

Checking unconnected pins...

Checking slots...

Checking duplicated slots...
ERROR: duplicated slot 1 of uref U1

Checking unused slots...

No warnings found.
Found 2 errors.
---------------

Running this schematic through gsch2pcb works OK: I get no problems in
PCB and all the pins on U1 are connected correctly.


Reading the FAQ at:

http://geda.seul.org/wiki/geda:faq-gschem#what_should_i_do_about_power_pins_on_my_symbolsmake_them_visible_explicit_or_invisible_implicit

tells me:

---------------
.... That said, it may still be useful to detach the power pins from
the functional part of the symbol. To do so, define a seperate power
symbol and give it the same refdes as the functional part. A run of
gsch2pcb will treat the siblings properly as one single component. As
neither gschem nor gsch2pcb explicitely know that the component is
only complete with both symbols defined, you have to check yourself.
With this workaround, you can draw all power related circuitry in one
corner of the schematic where it does not interfere with the signal
nets. In many cases this is advantageous with analog circuits.
---------------


** Therefore, my question is this: are the gschem DRC errors for such
symbols to be expected?

Any insight on this would be gratefully received.

Thanks,

   Andy

http://signality.co.uk


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