Not sure if you have had a look at our design guide for FullFlex devices - http://www.cypress.com/file/151216/download
It has the status of each of the pins which are not in use.
For power supply- we recommend to have a decoupling capcitor for every pin and a bulk capacitor for every set of power rails. If there is a space constraint, we recommend to do a power integrity analysis to get the optimal value of bulk/decoupling capacitors array.
Thanks for your help. I had found the design guide.
I guess I did not ask my first question very well. Let's say I am using the left data ports as inputs only and that I need only 70 of the 72 bits. What should I do with the two unused bits - tie them high via a resistor, tie them to ground or leave them open?
With respect to decoupling, do you recommend any particular value capacitors?