On 9/7/2012 10:04 AM, Kent A. Reed wrote: > On 9/3/2012 4:51 PM, Michael Haberler wrote: >> well, that seems to work just fine - no major surprises >> >> here's as screenshot from a logic analyzer connected to an Intel D5252 >> parport, running the userland parport driver in sim mode >> >> http://static.mah.priv.at/public/uparport.png >> >> it's a 1kHz square; there are delays of up to 4ms in this trace. > Logic analyzers, oscilloscopes---I know the drill but I no longer have > easy access to such instrumentation. > > Has anyone come up with simple (e.g., inexpensive) ways to measure > latencies in the range we are interested in - say a range of 1K - 100K > pulses per second with pulse widths on the order of microseconds. > > Back when the world was young and we wannabe researchers avidly read > from cover to cover in each new data-book from the likes of TI and > Motorola, I used to design and build comparable circuits, but then I had > the bench instrumentation to test my testers, so to speak. Now I'm in a > catch-22 situation. > > If I could turn back the clock, I'd probably use this problem as a > reason to explore FPGA, but instead I'm noodling about using a > Beaglebone or somesuch as a starter. > > Thoughts, anyone? > > Regards, > Kent >
I scan hackaday.com everyday or so. Yesterday this juicy item about building a counter using a US$70 FPGA board showed up http://hackaday.com/2012/11/02/building-a-100-mhz-frequency-counter/ It convinces me I wasn't too far off. Cut off its tail, bob its nose, paint it yellow, and I could turn this crocodile into a golden retriever. So much to do and so little time. Regards, Kent ------------------------------------------------------------------------------ LogMeIn Central: Instant, anywhere, Remote PC access and management. Stay in control, update software, and manage PCs from one command center Diagnose problems and improve visibility into emerging IT issues Automate, monitor and manage. Do more in less time with Central http://p.sf.net/sfu/logmein12331_d2d _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
