This design demonstrates the use of the simulation model loading and test vector features in the DesignWorks Simulator. This demonstration requires DesignWorks™ 4.0 and the DesignWorks Simulator. To try this file:
• If not already done, start DesignWorks in the usual way and open the file Model & Test Vector Demo. The 74XX parts in this design have no simulation models in them, so simulation will be completely non-functional until we load them.
• Select the SimLoad command in the Tools menu. SimLoad is a tool that attaches simulation models to devices in a circuit.
• Click on the Model Folders button. This allows you to specify which folders contain the simulation model files.
• Click on the Add Folder button. This will display a standard open file box. Using the standard buttons on the file locator box, locate the folder "Models" and click on the Directory button.
• Click on the Done button in the Model Folders box.
• Click on the Attach Models button. This option will search the models folder for internal circuit corresponding to the devices in the circuit.
• Select the "Full Design" option, if it is not already, then click the Attach button. You will see a progress box reporting the external model files being read in. When the process is completed, a summary box will be displayed showing the number of devices updated.
• Click Done on the SimLoad box.
The design is now ready to be simulated! A set of test vectors has been saved with the design and can be used with the TestPanel to verify the design.
• Select the TestPanel command in the Tools menu.
• In the File pop-up menu in the TestPanel, select the Load From Design Attr command. Select the attribute field TestVectors.Cct, if it is not already, and click the Load button. You will see a set of test data appear in the "spreadsheet" area of the TestPanel.
• Click the Reset button on the TestPanel to ready the TestPanel to start, then click the Walk button. You will see the TestPanel move through the test procedure, setting up signal inputs and checking the results. If all goes well, the message "All Test Vectors Passed" will appear in the TestPanel's status box.
The test can be rerun any number of times by clicking Reset, then Walk.
You may wish to also have the Timing window displayed while running this test, by selecting the Timing command in the Tools menu.
