It's true that 16V8s are pretty much over hill, but there's one thing that will keep them alive from a long time to come. They can dissipate over a watt-and-a-half without frying and without a heat sink. Short of discrete transistors, they are still the cheapest LED drivers available and you get all the decoding logic in the same package!
Matt Polak wrote: > Hey Gary! > > Glad to hear you got it all working! Gotta love that > characteristic quirkyness of Protel to keep you on your feet and > occasionally frustrate you for a few hours here and there, eh? It's all > somehow worth it in the end. :> > > Another package you may want to consider grabbing (it's free!) is > Xilinx Webpack. (www.xilinx.com) It does CPLD fitting for older logic, as > well as the Xilinx series of CPLDs, as well as most all of Xilinx's FPGA > parts. It also includes JTAG programming for most all parts, through a > cable that costs about $5 in parts to build and who's schematic is provided > free in the appnotes. > > I was originally doing quite a bit of work with the 16V8s, but > they're really starting to get phased out these days, and I was usually > having to use a half-dozen of them on a board at once. You may want to look > at some CPLD parts like the XC9536 and XC9572 from Xilinx. They're a couple > bucks in single quantity, Digikey stocks them, and they're reprogrammable > thru JTAG in your circuit! No more crash + burn ZIF socket testing. You can > essentially replace a handful of 16V8s with a 9536, have a tiny footprint, > cost less, be easier to (re)program, and best of all use the same logic > expressions and such that you're using for your 16V8s! > > And I definitely second your opinion about this mailing list. It's > been an amazingly useful resource with a lot of helpful and friendly > people. :> Good luck with your design! > > Regards, > -- Matt > > At 03:51 AM 3/10/2002 -0800, you wrote: > >3/10/02 > > > >Matt, > > > >Thank you very much. I created sixteen different plds and wrote 560 lines > >of simulation > >code to test them. With the exception of a few typos, everything moved > >along without any > >problems. In the past I have always used Palasm to prepare PLD files, but > >with my new 2GHz > >computer, I figured it was time to leave the old Dos crap (though easy to > >use) behind > >(except for Autotrax, even though I'll never use it again, I still like > >having loaded just > >in case...my all time favorite love/hate relationship). > > > >Considering this was my first experience with CUPL, I was suprised at how > >smoothly > >everything went, although I was puzzled at why no .jed files were showing > >up as I completed > >each part. Even the .SO and waveform outputs worked perfect. After > >completeing the last > >part, needless to say, without the .jed file all else is a waste of time. > >I spent more time > >reading and rereading the tutorials, the handbook and the website trying > >to figure out how > >to get the damn .jed files. > > > >After getting your response I opened 99SE and looked in the ddb folder and > >still no .jed > >files. Still hopeful, I shut down 99SE, opened Windows Explorer and > >looked in the ddb root > >folder again and BINGO! There they were, all sixteen .jeds. This is > >classic Protel > >mentality. Since they fixed the endless file backup problem, I never > >bother to look in the > >root file anymore. What truly surprises me is that you can't see the > >.jed files when > >you're in the 99SE evironment! Go figure... > > > >Thanks again. This is the best user group I have ever subscribed to, > >certainly the one > >with not only the most problems but the most difficult. Very competent group. > > > >Gary Packman > > > >Matt Polak wrote: > > > > > Hey Gary (et al), > > > > > > I've been using Protel to generate JEDECs for GAL16V8's and > > > similar for the past year or so without difficulty, though SOME quirkyness > > > in getting Protel to process the files and output correctly. > > > > > > As an example, the stripped down header from one of my PLD files > > > (called 'decoder.pld' inside Protel) looks like this: > > > > > > > > >/*************************************************************************************/ > > > /* Advanced PLD99: Schematic to CUPL > > > translator */ > > > > > >/*************************************************************************************/ > > > /* Translated at > > > 04:50:46 */ > > > /* on > > > 20-Nov-2000 */ > > > > > >/*************************************************************************************/ > > > NAME sigdecoder; > > > DATE 12/20/2000; * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/[email protected] * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
