antenna.tcl

Hierarchical antenna check, run by make ant.

Extracts the cell into ant/ext and runs magic’s antennacheck, which compares the area of metal attached to a gate against the gate area and reports every net over the process limit.

extract path ant/ext
extract all
antennacheck debug
antennacheck -p ant/ext

crashbackups stop and drc off keep the batch run quiet and fast; snap internal avoids moving anything onto the display grid.

The log goes to ant/<CELL>_ant.log and is summarised by script/checkant, which turns it into a CSV.

Use antenna_flat.tcl instead when the violation only appears once the hierarchy is flattened, which is the usual case for a net that is routed across several cells.