When running a project that has ChipScope cores in it, the following error message occurs:
ERROR:PhysDesignRules:798 - The network <xx> has an antenna. Routing is incomplete.
Check to see if there are any probes between DCM/PLL outputs and BUFGs. If so, move these to BUFG outputs. Below is an example:
.CLK0 (CLK), // 0 degree DCM CLK output
.CLKFB (CLK_bufout) // DCM clock feedback
BUFG CLK_BUFG_INST (
To work around the problem, move the probe from CLK to CLK_bufout.