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What is the correct PCB design impedance to use for an LPC4330 GPIO/SGPIO output pin?

Question asked by Tim Hutcheson on Mar 28, 2018
Latest reply on Mar 28, 2018 by Kerry Zhou

In particular, I' designing a high speed SGPIO 8 lane transfer pipe between two LPC4330 and am interested to know if I can avoid adding 33-50 ohm series resistors for a length of less than two inches between processors or not.

I was not able to find any impedance information in the literature available but assume that no source resistors a re built into the device.  Is that true?