<repack_design_constraints> <pin_constraint pb_type="clb" pin="clk[0]" net="clk0"/> <pin_constraint pb_type="clb" pin="clk[1]" net="clk1"/> <pin_constraint pb_type="clb" pin="clk[2]" net="OPEN"/> <pin_constraint pb_type="clb" pin="clk[3]" net="OPEN"/> </repack_design_constraints>