Some features of the HAC language were added specifically for the sake of netlist generation. We briefly describe them here, but the reader is referred to the full HAC language documentation, specifically chapters "Connections" and "PRS".
Recall that every process definition has two implicit ports for the power supply, !GND and !Vdd. When unspecified, the default behavior automatically connects transistors and subcircuits to these primary supplies, hierarchically and recursively. There are two places where we can override these supplies.