gEDA-user: Support for heterogeneous symbols?
Hi All, I am evaluating gEDA and came across one feature I am extensively using today with a commercial EDA tool when dealing with large components, like SOC, FPGAs and ASICs: heterogeneous symbols. I searched the doc, the mailing lists and the Web but could not find how I could create and use such symbols with gschem and gnetlist. As Roger Williams defines it in his post: http://www.geda.seul.org/ mailinglist/geda-dev6/msg3.html Heterogeneous devices are non-identical symbols that represent different parts of the same device for REFDES and layout purposes. They can be tied together by the same 'HETERO=DEVICE1,DEVICE2...' attribute on each device. Typical examples include: - large complex logic devices split between multiple symbols because of space constraints; - multi-function devices split so that each different functional block has its own symbol (relays, for instance); Does gschem support such a way to deal with large devices? If the answer is yes, then how? If the answer is no, then how are people dealing with it? Thanks, _jP ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: Support for heterogeneous symbols?
Yes, gschem supports heterogeneous symbols. Just set refdes (u101) the same for all parts of the same device. Further, if you'd like to have different labels for different symbol parts you can append lower case characters which are ignored by everything but are there for user convenience. (U101a, U101b, U101ioports, U53power, etc) -Lares On Thu, 8 Feb 2007 15:13:52 +0100 fricker [EMAIL PROTECTED] wrote: Hi All, I am evaluating gEDA and came across one feature I am extensively using today with a commercial EDA tool when dealing with large components, like SOC, FPGAs and ASICs: heterogeneous symbols. I searched the doc, the mailing lists and the Web but could not find how I could create and use such symbols with gschem and gnetlist. As Roger Williams defines it in his post: http://www.geda.seul.org/ mailinglist/geda-dev6/msg3.html Heterogeneous devices are non-identical symbols that represent different parts of the same device for REFDES and layout purposes. They can be tied together by the same 'HETERO=DEVICE1,DEVICE2...' attribute on each device. Typical examples include: - large complex logic devices split between multiple symbols because of space constraints; - multi-function devices split so that each different functional block has its own symbol (relays, for instance); Does gschem support such a way to deal with large devices? If the answer is yes, then how? If the answer is no, then how are people dealing with it? Thanks, _jP ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user pgpglOcQt2hVM.pgp Description: PGP signature ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: Support for heterogeneous symbols?
fricker [EMAIL PROTECTED] wrote: I am evaluating gEDA and came across one feature I am extensively using today with a commercial EDA tool when dealing with large components, like SOC, FPGAs and ASICs: heterogeneous symbols. I searched the doc, the mailing lists and the Web but could not find how I could create and use such symbols with gschem and gnetlist. Ah yes, as the mailing list archives can attest, this was also one of my first questions when I started using gEDA! (No, I've never used any commercial EDA tools because I refuse to use Weendoze or Solaris or whatever other proprietary OS they require, but I've entered the HW eng field from a software background after watching the HW engs I was working with and wanting to do that too. As my work has always been with large microprocessor-based systems, all schematics I've ever seen (for very complex microprocessor-based boards) use lots of heterogeneous symbols.) Does gschem support such a way to deal with large devices? Yes. The schematics for the SDSL board that I've just captured and getting ready to lay out make heavy use of heterogeneous symbols. The MC68302 microprocessor is split into 3 symbols, the SDSL transceiver into 5, and the FLEX10K FPGA also into 5. If the answer is yes, then how? Make separate and independent symbols. Each symbol would cover a subset of the device pins, and each pin would have its correct number, so when this is done right each pin number will appear in exactly one of the symbols. Instantiate all these symbols on your schematic (can be on the same page or different pages of a multipage non-hierarchical schematic, the kind I'm used to) and give the same attributes, particularly the refdes (and the footprint if you attach it at the schematic level rather than in the symbol) to all symbol instances describing parts of the same physical component. HTH and welcome to Free EDA! MS ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
