Before XOFF could be connected properly, I first needed to do some renaming and cleanup:
- Removed occurrenses of XOFF which don't actually mean XOFF (signals, ports, etc)
- Renamed Up* to FromHost and Down* to ToHost because these names were actually wrong, opposite of what is used in Atlas.
- Some removal of unused ports, nets, signals and other warnings raised by Sigasi
- Added FIFO monitoring in Wupper (BAR0)
- After all this, the actual XOFF connections are possible
- Connected global XOFF (from both PCIe endpoint's CentralRouter) to endpoint0, link0 to have all fullmode links XOFF possible on one GBT link.
- Added TTC option 8: 2-bit XOFF + L1A
- Continuously send XOFF / XON according to the level of the signal, every 16 bytes (instead of IDLE)
Closes FLX-1827