PAL's and GAL's
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From: Paul Burke on 30 Mar 2006 06:54 jozamm(a)gmail.com wrote: > > Thanks for all the information. The only interest is more academic as i > want to use them for demonsration purposes... > The reason wanting schematic entry is for my students to visualize what > is happening rather then the luxury of schematic entry for itself. Well done for introducing your students to this. Far better than the sterile "implement the following requirements using 2 input NAND gates" that is still all too common. How about using one of the equation input packages, but giving the students the task of producing the equations from the schematic? Paul Burke
From: John Larkin on 30 Mar 2006 11:25 On 29 Mar 2006 22:02:06 -0800, "jozamm(a)gmail.com" <jozamm(a)gmail.com> wrote: >Hi ppl, > >I need to program sevetal PAL's and GAL's in an educational enviroment. >I will be using a hobbyist programmer to do the programming as i do not >need any large volumes. > >What software is available to enter the logic equations and compile to >the fuse file? Does any schematic entry software exist which one can >enter the schemtic and compule to the fuse map? > >Any sort of help on PAL's and GAL's would be greatly appeciated. > >Joseph Zammit >Malta The ICT Place software is (I think) free http://www.ictpld.com/ftp/an7.pdf but you will need a programmer of some sort. I'm currently doing a PEEL 22CV10 design (blast from the past! There's nothing like having 10 macrocells to make you really reduce a design) and I'm using the older Dos-based APEEL software ("if you have a system with two floppy disks...") which is just simple PALASYM/ABEL syntax text entry of logic equations. There's probably some copies of PALASYM floating around (I must have one somewhere in the archives, I guess) for programming the genuine oldies, the PAL16L8's and such. John
From: Joel Kolstad on 30 Mar 2006 11:26 <jozamm(a)gmail.com> wrote in message news:1143710640.205620.290380(a)z34g2000cwc.googlegroups.com... > Thanks for all the information. The only interest is more academic as i > want to use them for demonsration purposes since i teach a vocational > engineering course i do not only need to explain the use but even to > show these devices working. I cant use VHDL or Verilog because the > level is pitched too high for my students. I have a hard time believing that your students can be smart enough to correctly implement designs using schematic capture but not using Verilog or VHDL. Not to mention what's already been said about industry using HDLs, so there's questionable benefit to spending time teaching people obsolete technology. > The reason wanting schematic entry is for my students to visualize what > is happening rather then the luxury of schematic entry for itself. Unless you restrict your students to only using AND gates & OR gates, flip-flops and perhaps an inverter on the input & output, this isn't going to happen. All the old schematic packages already had most sophisticated functions such as counters, shift registers, etc. built up for you to use (in fact, some tools had complete libraries of almost all the 74xx logic ICs!). Some tools would let you "drill down" and see the "primitive" logic elements used to implement the functions, though. ---Joel
From: Jonathan Kirwan on 30 Mar 2006 13:12 On 29 Mar 2006 22:02:06 -0800, "jozamm(a)gmail.com" <jozamm(a)gmail.com> wrote: ><snip> >What software is available to enter the logic equations and compile to >the fuse file? Does any schematic entry software exist which one can >enter the schemtic and compule to the fuse map? ><snip> I've looked over the responses and do not yet see a direct answer to the question of allowing a schematic entry of logic leading to a fuse map output, with a free tool. I would guess that if you could find a package that supports schematic entry (such as perhaps Altium Designer) and also supports GALs and PALs (don't know about Altium on this score), that you'd get there. But that's _very_ expensive to consider. What else might there be? Seems simple enough to do after the schematic entry graphical part of it is done -- and that itself can be kept relatively simple. An idea -- not sure if it would help. But it would be possible to use Linear Tech's LTSpice (SWCADIII) to do the schematic entry part of the job. It's free to anyone. It isn't difficult to create the symbols that would be used for teaching and the schematic is saved in ASCII form. I've already written the software to parse that ASCII source into an internal form that may be usable for generating the logic equations which could then be input to CUPL, I suppose. Would this fit the need? Jon
From: samiam on 30 Mar 2006 14:13
I have got a copy of CUPL (4.x? I think) I can send you if you are writing logic equations for 16x8 and 22v10 and such > What software is available to enter the logic equations and compile to > the fuse file? Does any schematic entry software exist which one can > enter the schemtic and compule to the fuse map? > > Any sort of help on PAL's and GAL's would be greatly appeciated. |