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Re: gEDA-user: Re: hierarchy of schematics
Kai-Martin Knaak wrote:
My guess is that all net names are
global, and in-1.sym and out-1.sym (for example) are purely
informational. I also don't know if the DRC is smart enough to tell
you if an output on sheet A is connected to an output on sheet B.
Just tested this the other day for a set trivial sub sheets.
Result: Pin names and components receive the refdes of the top level
symbol as a prefix. Thus they are strictly local to the sub sheet. It is
even possible to source the same sub sheet several times in the master
sheet.
The port symbols in-1.sym and out-1.sym are not quite informal. The
important part is their refdes. The netlister gsch2pcb checks for every
pin label of the top level symbol if there is a refdes with the same name.
The drc2 output will issue a warning, if there is a pin in the top level
symbol that corresponds to no port on the sub sheet. It will also warn if
a port symbol does not connect to a pin in the top level symbol.
And also put a source=some-schematic-name.sch attribute on the symbol
that represents the subschematic.
Some mechanism to automatically generate a "sheet symbol" would be very
useful.
Ack. This is, what John G. was talking about.
---<(kaimartin)>---
(I will netlist my first big sub sheet project today after the unconnected
pin errors have been dealt with...)
Andy Peters wrote:
>> We need to dream one up, a gschem schematic to sub-schematic-symbol
>> genreating script, that is....
>
> Agreed, this is necessary for board designs (I won't do an FPGA design
> in a schematic). It's impossible to get even a small design to fit onto
> one B-size sheet, considering how things are scaled in gschem. (My
> little IR volume control design is three sub-sheets plus a top level.)
There is a script you might like on
http://www.gedasymbols.org/user/john_griessen/ jgboxsym It's like djboxsym to
launch, but makes more compact symbols so I can cram more into a B-size sheet.
I do that and use an actual B size (11 x 17 inch) paper tray to print them.
John Griessen
ex chiphead
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