Specifying Command-Line Options for Spectre FX

You can set the simulation preset mode or the high-level options at the command line. The command-line options help you to further simplify the use model.

You can specify the following command-line options for Spectre FX:

Option	Description
`[preset=mode]`	Specifies the preset mode. Possible values are `baseax`, `basemx`, `baselx`, `basevx`, `ax`, `mx`, `lx`, and `vx`. The default mode is `lx`.
`+[option]`	Specifies the additional options that can be used. Possible options are `speed` and `optimize`.

The options specified at the command line have the highest priority and override the same setting in the configuration file or the netlist.

Examples

The following code sets the preset mode to baselx and the parasitic optimization to mx:

%> spectrefx +baselx +optimize=mx -f fsdb +mt=8 top.sp

The following code sets the speed option for simulation tolerance to mx. By default, the preset mode is lx.

%> spectrefx +speed=mx +mt=8 top.sp

Spectre FX Circuit Simulator User Guide
Product Version 23.1, September 2023