NET "osc" LOC = P50 | IOSTANDARD = "LVCMOS33";

NET "osc" TNM_NET = "tnm_osc";
TIMESPEC "TS_osc" = PERIOD "tnm_osc" 20ns HIGH 50%;

NET "txd"  LOC = P102 | IOSTANDARD = "LVCMOS33";
NET "rxd"  LOC = P101 | IOSTANDARD = "LVCMOS33";