> 5 Volts? How quaint. Yeah, well, that's what the eval board uses. My furnace controller uses 5v too, because that's what the LCD panels need. It throws in a bunch of issues about level converting, though.
> You didn't give the thickness of the FR4 between the trace and the > ground plane. Double sided, 0.062. > Series resistors for a bidirectional trace go near the middle of > their length. For unidirectional traces, place the resistor anywhere > from the middle to the source end. I figured that; they're going on the SRAM side of the DIN connector, about in the middle of the run. > It takes a good FET probe and a fast 'scope to characterize the > system well enough to optimize on the bench. I have a 32 Ms/s scope and a 500MHz logic analyzer, neither of which is great for this kind of test, but might be close enough. > Any resistor in the range of 25 to 150 Ohms will damp the ringing. > Whenever I have this concern, I just put in 100 Ohms, observe that > it works, and go on to the next chore. Ok, sounds reasonable. Thanks! _______________________________________________ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user