The postlayout command line option (postlayout)

Description

This option enables various technologies to speed up post-layout simulation including RC reduction, efficient coupling capacitor handling, advanced DC algorithms optimized for large post-layout circuits, along with other advanced numerical techniques.

The +postlayout option delivers best simulation performance, with acceptable accuracy, for custom digital designs, memory designs, and analog/mixed-signal designs where high simulation precision is not required.

+postlayout=hpa provides higher simulation precision for analog /mixed-signal designs.

+postlayout=upa delivers the ultimate post-layout simulation accuracy, similar to +postlayout=hpa, but with RC reduction completely disabled.

Even though not recommended, +rcnet_fmax=N command-line option can be used to adjust the simulation accuracy associated with +postlayout. The unit for N is in GHz and the default value is 125. N=25 is considered aggressive, whereas N=250 is considered conservative. The +rcnet_fmax option not only controls RC reduction accuracy with any local RC net, but also defines the accuracy/performance trade-off of other non-reduction based techniques. rcnet_fmax is available as a Spectre command-line argument or option.

+postlayout=legacy/legacy_rf options provide backward compatibility with the +parasitics/+parasitics=rf options respectively. Accuracy of the +postlayout=legacy option can also be adjusted using the rcr_fmax option.

Definition

 +postlayout in the command line