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Quantus-Pegasus Integration for Partial Layouts

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By combining parasitics extraction and physical verification sign-off capabilities of Cadence® Quantus™ Extraction Solution and Cadence® Pegasus™ Verification System, respectively, Virtuoso Layout Suite EXL provides sign-off level accuracy in EAD.

This flow requires all devices to be placed in the layout; the position of these devices may however not be the final.This flow enables the user to specify a reference net, known as the ground net, before extraction rather than before simulation.

Related Topics

Creating Pegasus/Quantus Setup for Parasitics Extraction

EAD Pegasus/Quantus Create Setup File Dialog Form

Creating Process and Setup Files Manually

Extracting Parasitics from a Partial Layout

Viewing and Analyzing Parasitics

Extracting LDE Parameters

Resimulating Designs with Extracted Parasitics

Using Distributed Processing Jobs

Creating Pegasus/Quantus Setup for Parasitics Extraction

Before creating the Pegasus/Quantus setup for parasitics extraction, you must have the following:

• LVS rules file with the LVS settings for the reference design
• Applicable Pegasus license
• Applicable Quantus license
• Quantus CCL file with the correct settings for the reference design

To create Pegasus/Quantus setup for parasitics extraction:

1. Open EAD Browser from either Virtuoso Layout Suite EXL or MXL.
2. From the toolbar of EAD Browser, click and select Create Pegasus-Quantus Setup.
   The EAD Pegasus-Quantus Create Setup File Dialog form opens.
   
   
3. In the Quantus CCL File Path field, type the file path of the Quantus CCL file. You can also click Browse to select the Quantus CCL file.
4. In the PVS GUI Log File Path field, type the file path of the PVS GUI log file. You can also click Browse to select the PVS GUI log file.
5. Click OK.

The setup file and process files are saved to the following locations inside your current working directory, respectively:

• .cadence/dfII/EAD/1/setup/setup.ini
• .cadence/dfII/EAD/1/process/process.ini

After you load the EAD Pegasus/Quantus Setup for extraction, the following options become disabled:

• The EM tab on the EAD Option form.
• The EM and IR Drop tabs on the EAD Browser.

Related Topics

EAD Pegasus/Quantus Create Setup File Dialog Form

Extracting Parasitics from a Partial Layout

Creating Process and Setup Files Manually

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Creating Process and Setup Files Manually

You can also create the process.ini and setup.ini files manually.

To create the process.ini file manually:

1. Open a new file using any text editor.
2. Type the following in the file:
   

   [corners]

   technologyLibraryFile= /<path_to_the_directory>/pvtech.lib

   1\technologyName=<name_of_technology_file>

   1\name=nom

   size=1

3. Save the file at the following location inside the current working directory:
   

   .cadence/dfII/EAD/1/setup/setup.ini

To create the setup.ini file manually:

1. Open a new file using any text editor.
2. Type the following in the file:
   

   [connectivity]

   pvsRulesFile=/<path_to_the_directory>/pvs.rul

   [extraction]

   processSettings=./.cadence/dfII/EAD/1/process/process.ini

3. Save the file at the following location inside the current working directory:
   

   .cadence/dfII/EAD/1/setup/setup.ini

Related Topics

EAD Pegasus/Quantus Create Setup File Dialog Form

Extracting Parasitics from a Partial Layout

Viewing and Analyzing Parasitics

Extracting Parasitics from a Partial Layout

With the in-design integration of Quantus, Virtuoso Layout EXL provides ability to extract LDE parameters and RC parasitics from a partial layout. This enables quicker feedback loop to run layout-aware re-simulation, and tuning the circuit performance early without waiting for a complete LVS -lean layout.

To extract parasitics from a partial layout:

1. Create the Pegasus-Quantus Setup using the EAD Pegasus/Quantus Create Seup Dialog form.
2. From the toolbar of EAD Browser, click and select the Pegasus-Qunatus setup.
   All available nets from the setup are loaded in the EAD Brwoser.
3. In the Ground Net field, specify a ground net. Alternatively, right-click a net in the EAD browser table and then select Set As Ground Net.
   You can also keep the default selection 0, which indicates that extraction are run with respect to an imaginary ground net.
4. From the toolbar of EAD Browser, click and select Extract Parasitics For All Nets.
   The extraction process is completed in the following four phases.
   • Preparing design for EAD
   • Running job: Connectivity Extraction
   • Running job: LVS
   • Running job: Parasitic Extraction
     
     Additional nets may appear in the browser derived from the connectivity analysis engine.
5. After the extraction is complete, extraction results are displayed in the EAD Browser.

Related Topics

EAD Pegasus/Quantus Create Setup File Dialog Form

Creating Pegasus/Quantus Setup for Parasitics Extraction

Extracting LDE Parameters

maxResistorLength

Viewing and Analyzing Parasitics

Extracting LDE Parameters

In addition to parasitics extraction, you can also choose to extract only LDE (layout-dependent effects) parameters.

The extraction of LDE parameters is carried out in following phases:

• Pegasus is run with either a Pegasus Interactive or a sign-off license on the layout view and extracts all the devices and their device parameters.
• Quantus is run with either a Quantus Interactive or a sign-off license, keeping RC extraction turned off, to generate a SmartView. This SmartView consists only layout- extracted devices and their parameters.
• The SmartView is then used for simulation.

To extract LDE parameters:

1. Create the Pegasus-Quantus Setup using the EAD Pegasus/Quantus Create Seup Dialog form.
2. From the toolbar of EAD Browser, click and select the Pegasus-Qunatus setup.
   All available nets from the setup are loaded in the EAD Brwoser.
3. In the Ground Net field, specify a ground net. Alternatively, right-click a net in the EAD browser table and then select Set As Ground Net.
   You can also keep the default selection 0, which indicates that extraction are run with respect to an imaginary ground net.
4. From the toolbar of EAD Browser, click and select Extract LDE parameters only (no parasitics).
   The extraction process is completed in the following three phases.
   • Preparing design for EAD
   • Running job: Connectivity Extraction
   • Running job: Parasitic Extraction

Related Topics

Creating Pegasus/Quantus Setup for Parasitics Extraction

EAD Pegasus/Quantus Create Setup File Dialog Form

Extracting Parasitics from a Partial Layout

Viewing and Analyzing Parasitics

Resimulating Designs with Extracted Parasitics

Viewing Log Files

You can view the CDL netlister log file, LVS log file, and extraction log files.

To view these files:

• From the toolbar of EAD Browser, click and select either one of the following options:
  • View CDL Netlister Log File
  • View LVS Log File
  • View Extraction Log File

For more information about these files, refer to Quantus Extraction Users Manual.

Related Topics

Creating Pegasus/Quantus Setup for Parasitics Extraction

EAD Pegasus/Quantus Create Setup File Dialog Form

Extracting Parasitics from a Partial Layout

Extracting LDE Parameters

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