Product Documentation
Virtuoso Layout Suite XL: Connectivity Driven Editing User Guide
Product Version IC23.1, November 2023

chainLeftNet

layoutXL chainLeftNet string { "Source" | "Drain" | "Either" }

Description

Controls whether source or drain nets are optimized to the left of generated chains. The default is "Source", which means a chain is optimized so that one of its source nets is on the left-hand side (where possible).

"Source" and "drain" here refer to schematic source and drain nets and not layout source and drain nets, which may have been permuted.

Set to "Either" if you have no preference (and to maintain the default behavior from previous releases). Values must be enclosed in quotation marks.

Arguments

"Source"

Optimizes the generated chain so that one of the schematic source nets is on the left-hand side of the chain (if possible).

"Drain"

Optimizes the generated chain so that one of the schematic drain nets is on the left-hand side of the chain (if possible).

"Either"

Preserves the default behavior from previous releases.

GUI Equivalent

Command:

Options – Connectivity (Generation)

Field:

Chain Left Net

Examples

envGetVal("layoutXL" "chainLeftNet")
envSetVal("layoutXL" "chainLeftNet" 'string "Drain")
envSetVal("layoutXL" "chainLeftNet" 'string "Either")

Related Topics

Connectivity Form

Generate Chained Devices Form

List of Layout XL Environment Variables

Setting Environment Variables


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