TIMESPEC "TS_P2P" = FROM "PADS" TO "PADS" 10 ns;
NET "clka" TNM_NET = "clka";
TIMESPEC "TS_clka" = PERIOD "clka" 20 ns HIGH 50 %;
NET "clkb" TNM_NET = "clkb";
TIMESPEC "TS_clkb" = PERIOD "clkb" 20 ns HIGH 50 %;