<p>Waiting for a LA to compile into that part of the design but at a high level I can see the bug now. The MDMA is rounding the frame up to a 64 bit boundary while writing to the TX FIFO.</p><p>This is OK, the existing datapath roundsd up to a 32 bit boundary already, and I had a register in the TX buffer where I write the *actual* frame length so I know to ignore the trailing padding.</p><p>Something there probably didn't account for a >= vs == case or something so once you add more than one word of padding it probably breaks something.</p>
