Runtime Configuration

SpiceBind reads its runtime configuration from environment variables.

SPICE_NETLIST

Path to the ngspice netlist.

HDL_INSTANCE

HDL instance path, or a comma-separated list of instance paths.

VCC

Supply voltage used for digital-to-analog conversion. Defaults to 1.0.

SPICE_DUMP_RAW

When set to any value, writes ngspice transient data to dump.raw when the simulation shuts down. This is disabled by default because co-simulation runs can produce very large raw files.

To enable the raw dump:

export SPICE_DUMP_RAW=1

HDL simulator

The test suite and examples select the HDL simulator with SIM. The default is icarus. Set SIM=verilator for Verilator 5 (needs --timing and --vpi). This variable is read by the Python runners, not by the VPI plugin.