v2.1 - 4ns/s jumps when non-PTP traffic is sent through WRPC
Peter has observed that his WRPC synthesized for Kintex-7 looses stable timing when non-PTP frames are sent through external WR Fabric interface. He sends bunches of 16 packets to the WR-switch. The packets are UDP with payload 2, 4, 6,... 32 bytes (Ethernet Packet size 60-74 bytes) sent with 25.8 KHz (bandwidth ~200 mbps). Then the servo is still in TRACK_PHASE state but 1-PPS signal drifts away ~4ns/s.