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Re: gEDA-user: Question about gschem DRC errors when using separate power pin symbols.
Perhaps I should ask a different question then ....
Is there a better tool to use for gschem DRC?
In the meanwhile, I think I may add a comment to the pwr pins symbol
to remind me that it will show up a refdes and slot error.
:)
I think that answers my question
Thanks,
Andy.
http://signality.co.uk
2009/6/11 John Doty <jpd@xxxxxxxxx>:
> drc2 has a very narrow view of how the world works. If you are doing
> a pure digital design using a single logic family using hidden power
> pins, it's not *too* bad. But generally, it hides real errors behind
> a flood of messages about things that aren't errors at all. gEDA is
> much more flexible than drc2 understands. It's generally only useful
> if you've learned to find the few real issues in the flood.
>
> DEVELOPERS:
>
> WHY DO WE RECOMMEND THIS FLAWED, NARROW, EXPERT TOOL, REPEATEDLY AND
> OBNOXIOUSLY, TO ALL WHO USE GNETLIST, EVERY TIME THEY USE IT?
>
> On Jun 11, 2009, at 10:28 AM, Andy Fierman wrote:
>
>> 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_visibl
>> e_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
>>
>>
>> _______________________________________________
>> geda-user mailing list
>> geda-user@xxxxxxxxxxxxxx
>> http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
>>
>
> John Doty Noqsi Aerospace, Ltd.
> http://www.noqsi.com/
> jpd@xxxxxxxxx
>
>
>
>
> _______________________________________________
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> geda-user@xxxxxxxxxxxxxx
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>
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