Hi
> On Nov 8, 2014, at 7:14 PM, cfo <[email protected]> wrote: > > On Sat, 08 Nov 2014 18:17:09 -0500, Bob Camp wrote: > >> Hi >> >> I’ve done a lot of designs with Altera parts. They are fine parts, but >> they are not magic. > > SNIP > > The Cyclone 2’s had a minimum rated PLL >> input of 20(?) MHz. The later parts bumped that down to 10 MHz. Much >> more TimeNuts compatible. >> >> Bob >> > > Bob > > Hmmm ... > > I didn't know the CycloneII had a Min of 20Mhz. > Is that in some doc you can point me to ? > > Well it seems to be 11Mhz for the CycloneII ... (Bummer from a T-Nut > perspective) > http://tinyurl.com/opvng2y > > > I just tried to do a 10 => 100Mhz PLL in the EP2C5T144C8 , using the > "MegaWizzard" , and there were no errors or warnings. > > Strange if the Min input is 11Mhz Back when they were new, I think the limit was higher than that. I suspect the simple answer is “does not work reliably at 10 MHz over all voltages and temperatures”. I haven’t done a Cyclone II design in many years. It’s been almost that long since I looked at a Cy II spec sheet. Bob > > Anyways , thanx for enlighten me Bob. > > CFO > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
