On May 7, 2009, at 1:28 PM, Stefan Salewski wrote: > On Thu, 2009-05-07 at 12:58 -0600, John Doty wrote: > >> >> From my perspective, your use of these symbols to name nets seems >> strange. I think of these as hierarchical connection devices. To name >> a net it is simpler and less confusing to use the netname= attribute >> rather than a symbol, I think. But it is again unclear what these >> symbols were intended for by their original authors. >> > > At the beginning the existence on net and netname attribute was very > confusing for me. > > Now I am using many in- out- io- and power-symbols with attributes > like > net=3.3V-plus:1 or net=ADC_D0 or Digital_In_Enable:1. > > Using such symbols makes it easy to move these nets around -- moving > from one FPGA pin to another for better layout, or moving to > another pin > of a microcontroller because the pin used prior is needed for > something > other. Or for duplicating netnames. > > I think I can not do this with netname attribute in such an easy way.
If you copy or move a net segment that has a netname attribute, the attribute goes along for the ride. Seems easy to me. > And I think it may happen that one deletes a net while modifying a > schematic without noticing that one has deleted the netname= too. > > My impression was that attribute graphical=1 was for devices which > should be not mounted on PCB, i.e. obsolete parts, external > temperature > sensors... Title blocks use graphical=1: they don't represent devices at all. One of my customers has the stylistic standard that a hierarchical sub-schematic should include the graphic for the symbol that represents it, as sort of a graphical comment. Attach graphical=1 to the symbol, and you get that. Ales broke this usage a few years ago (given the ambiguity of the meaning of graphical=1, that's understandable), but quickly fixed it at my request. I guess if you establish practice, you get a say in how the ambiguity is resolved... > > Of course a very precise definition of attributes would be very > important. > > Best regards > > Stefan Salewski > > > > > _______________________________________________ > geda-user mailing list > [email protected] > http://www.seul.org/cgi-bin/mailman/listinfo/geda-user > John Doty Noqsi Aerospace, Ltd. http://www.noqsi.com/ [email protected] _______________________________________________ geda-user mailing list [email protected] http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
