I've been reading about ringing and overshooting and all sorts of things, but all without getting a real "feeling" for how likely these things are to affect my circuit.
I've got a chip generating an SPI signal, traveling about 5cm to a 3.3->5V level shifter, and then traveling ~35cm (yes, it's a very long PCB) to the chip that receives it. From what I understand, I shouldn't have issues with this: my traveled distance isn't even 1% of the wavelength at 1Mhz, which gives me hope.
What considerations SHOULD I have in mind when laying out the PCB to avoid issues with this signal?