Re: spi communication
Well, in my case I had one way communications only. I was using a controller to drive a custom RF Receiver chip, and all I had to do was load up a few registers with the right bits. So, right at the receiver chip, I simply put a buffer gate chip on the three lines going into it.
If you are using the 2 way communicaitons, you are not going to be able to do that. But you could maybe make a simple lowpass filter on the clock line, maybe a series 22 ohm resistor with a shunt 100 pF or so capacitor. Or maybe a 220 ohm resistor to ground. Something to either better match the end of the line, or lowpass filter the clock ripples. The data lines are not so important, I was told, as the data transitions state long before the leading edge of the clock, so the data line is fully settled out.