On Wed, 03 Jan 2007 22:27:16 -0700, Andy Peters wrote: > On Dec 20, 2006, at 8:34 AM, John Griessen 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.) > > I haven't sorted out exactly how (or even IF) gsch2pcb sorts things > out when a project has more than one page and no top-level sheet with > lower-level sheet symbols. 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. > 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...) -- Kai-Martin Knaak http://lilalaser.de/blog _______________________________________________ geda-user mailing list [email protected] http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
