- Filtering "src" wasn't such a good idea...
- Fixing script for bitstream, bootgen doesn't overwrite existing bit stream files (thanks Xilinx, cost me an hour of anxiety!!)
- Still not 100% on this...but test passes
- Teset was hanging even though stim_done went high. Ticks not advancing, pointing towards comb loop, but what is different at end of test?
- Now to test read/writes of registers from axi and set the idelay registers
-Access without symmetry was awkward, now we can reach regs from TX or RX side
-Removes a special path for mailbox (came for free)
-At the same time reduced clock complexity (one clock for system!!)
-Moved mailbox to top level
-Changed main clock to "sys_clk" for all
