re "The programming software has a mode where yu can call up a library of old 74LSxxx parts and drop them on a canvas and draw lies between pins " You talkin bout Cypress's PSoC Creator, Willis? ;-) It doesnt sound like Xilinx or Altera's tools. tomp
On Mon, Jun 25, 2018 at 9:43 AM, Chris Albertson <[email protected]> wrote: > Maybe we've gone full circle. I just bought an $11 part on eBay. I it is > a CPLD. Like an FPGA but smaller and much less expensive and easier to > use. The programming software has a mode where yu can call up a library > of old 74LSxxx parts and drop them on a canvas and draw lies between pins. > They have other functional blocks too, just see of them have the old 7400 > numbers. I did something silly wired a bunch some LEDs to a 4-bit > counters and watch in count in binary. The 7400 series versions "Hello > World" but now I can do that with just one chip. The little CLPD can > simulate maybe 100 7400 type chips and they can be clocked at 50MHz > > SO it is the one chip solution that you wanted but the old SSI based > solution that engineer wanted t build. > > My use for it was counting encoder pluses up to about 1MHz. but I found I > could do that with a microcontroler for 1/3rd the cost and size. > > > > > On Sun, Jun 24, 2018 at 4:05 PM John Dammeyer <[email protected]> > wrote: > > > > > > What we have is the result of historic accident. EMC and machine > > control > > > in general got its start when computers where EXPENSIVE. You design > > > differently when you parts for five digit price tags than when you > parts > > > are nearly free. If computers cost $2 and two of them could fit on > your > > > thumbnail then you might just be inclined to use more of them. > > > > I remember having arguments with an engineer about using micro-processors > > (with EPROM) to do simple logic. He was adamant that TTL was a better > > solution because the processor was too expensive. My point was that > > processors were coming down in price and there were now single chip ones > > with EEPROM windows (before onboard flash) and that one chip would do the > > job of a large number of discrete devices. > > > > At the same time I was wire-wrapping up an S-100 board with an NED u7220 > (I > > think that was the number) video controller and the rest of the logic was > > all 74S series. He was wrong of course. Many projects don't need 20 TTL > > or > > CMOS chips and an Arduino is an ideal replacement. But only to a limit. > > > > > Combine the high-reduction cycloidic drive with a small low cost BLDC > > > motor > > > and you have a point for a robot arm (or leg) or a machine tool axis. > > > Here is a model of one of these motor and all -- please try the > "explode" > > > button to see the insides of the drive. (The button turns the drawing > > into > > > a parts diagram) https://a360.co/2KhamaI > > > > > Very cool! > > > > > > > OK back to real-time... > > > > > > > > ------------------------------------------------------------ > ------------------ > > Check out the vibrant tech community on one of the world's most > > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > > _______________________________________________ > > Emc-users mailing list > > [email protected] > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > > -- > > Chris Albertson > Redondo Beach, California > ------------------------------------------------------------ > ------------------ > Check out the vibrant tech community on one of the world's most > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
