VerilogA : how to use gnd in the code

[cadence for analog and rf]

hi

can anyone tell how to use the global gnd or gnd in the model


i need to assign output of the block to gnd if some condition
satisfies

----
if (V(x)) == 1.8)
V(out) <+ gnd ;

------------


this gives an error in spectre


can some one help me out in debugging this......