Philipp Klaus Krause <p...@spth.de> writes: > Am 31.12.2010 16:31, schrieb Stephan Boettcher: >> >> Maybe your time is better invested by using a small FPGA for whatever >> you want to build, and learn Verilog to express the logic. >> >> Depends how much fun can have from learning such stuff. A deadline does >> not seem to be your problem. >> >> (It should be possible to draw a gschem schematic, export a verilog >> netlist and upload that to the FPGA too, for parts of the circuit you >> feel more comfortable, but then you'd need to do both, symbols and >> Verilog :-) >> > > Well, sometimes you just need a few gates somewhere, e.g. one of my > boards contains just a 74LS21, a capacitor and an EPROM.
Well, we were talking about some library of symbols, presumably to express some more complex logic. To review a logic circuit diagram, it helps if you have symbols that are easy to read. A circuit with a single gate of glue logic does not need this kind of review. If Johnny wants to design a circuit with 74xx/4xxx series parts, he needs a schematic that he can easily review himself, and symbols that he grew up with will certainly help. If somebody needs to design a circuit expressed via schematic entry and some PHB demands those IEEE symbols, or the reviwer audience wants it that way, then such a library will be usefull too. I'd still try to convince said PHB to accept Verilog instead, but that may also be a waste of time. > Using a FPGA or even a CPLD would be overkill. While I prefer the "US" > symbols even though I grew up in germany; I know people that prefer > other symbol styles, and if they were there for those that want to use > them. I grew up with the symbols in the rightmost column here (DIN40700): http://de.wikipedia.org/wiki/Logikgatter#Typen_von_Logikgattern_und_Symbolik from a German TV series by Jean Pütz (1974, at age 10). I still find the US ANSI 91-1984 column easier to parse than the IEC 60617-12 symbols. -- Stephan _______________________________________________ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user