Adding timing improvements to tx_alignment pipeline.
Adding timing improvements to tx_alignment pipeline.

This does not fix the user bug, which occurs in the 64-bit interface. I suspect
this is a data under-read/over-read error in the data fifo but I have yet to
confirm it.

drichmond/riffa,drichmond/riffa,drichmond/riffa,drichmond/riffa,drichmond/riffa,drichmond/riffa