Honored Contributor
Honored ContributorThe spykes i see in SignalTap are 1 sample wide, so i assume that if there are phisical spiles, there are very narrow and maybe my oscilloscope with 200MHz bandwidth isn't enough to catch them.
Maybe ill implement a logic which detects spykes and producing an error output if there is one... Yes, i had verify that the oscillator is 50MHz, I also involved PLL in 1:1 configuration with same results. The "locked" signal was '1' (permanently), but i seen the same one-sample spykes on it also as on all other signals. If PLL looses its lock, it goes to "0" for much longer period, isn't it? I had created an internal signal which is constant '1' value and doesn't depend on anything, even not on reset. and i still see spykes on it... I must say that this issue looks very strange to me.... this is the 1'st time i use Cyclone IV device... In the past, with other Cyclone, Stratix and Aria devices i didn't got anything like it...
