Product Documentation
Simulation Driven Interactive Routing Task Assistant
Product Version IC23.1, June 2023

How do I perform resistance-driven interactive routing?

When you start the Create Wire command, the wires and vias interactively connect the pins and automatically estimate the final resistance between the two pins. Based on the estimated resistance and the maxResistance constraint, the wire width and via num cuts of the wire and via being edited are automatically sized so that the final wire resistance is below the value of the maxResistance constraint.
The SDR Maximum Resistance Check mode is disabled for the Create Stranded Wire command. Even when the mode is set to maxResistance through the weSdrElectricalMode environment variable, the Create Stranded Wire command behaves as if the EM mode is enabled.
To run maximum resistance check:

  1. Select a pin or an instance that you want to route.
  2. Click the drop-down arrow next to Interactive SDR Mode on SDR Toolbar.
  3. Select the Interactive SDR Max Resistance Check option from the drop-down list.
    Note: When the Interactive SDR Max Resistance option is selected, the icons on the SDR toolbar are updated with the icons for maximum resistance.
  4. To control the scaling factor applied to the target resistance when sizing the wires or displaying the resistance information, specify a value in the Max Resistance Target Percentage text box on SDR Toolbar. For example, if you specify the maximum resistance percentage as 50%, it means that the wire is oversized to reach a resistance of 0.5*maxResistance.
  5. Choose Create – Wiring – Wire.
  6. Start creating a wire from the selected pin or the instance.
  7. Click the drop-down arrow next to the Checker Mode icon on SDR Toolbar.
  8. From the drop-down menu, select a checker mode. You can select one of the following checker modes: Checker Mode: Enforce, Checker Mode: Notify, or Checker Mode: Off.
  9. To toggle between multiple maxResistance constraints, click the Cycle Max Resistant Constraints button on SDR Toolbar.
  10. To complete interactive routing, press Enter.

Related Topics

How do I identify the net connections that either consume or generate the most current?

How do I perform a current density check in interactive SDR?

How do I connect twigs in interactive SDR?

How do I optimize each segment using SDR?

Does simulation driven interactive routing supports over-device routing?

What tasks can I perform using the SDR toolbar?




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