Description
Yes. Designers often wish to see simulation outputs with pull-up or pull-down resistors on pins. The Quartus II simulator can include the effect of weak pull-up and pull-down resistors on output and bidirectional pins. This option is often used in conjunction with
OPNDRN or TRI primitives. When the Passive Resistor option is turned on, the results show up as a weak high (H) or a weak low (L).
You can turn on this option in the Assignment Organizer in the Quartus II software versions 2.2 and below using the following steps:
- Select the output or bidirectional pin and open the Assignment Organizer.
- Select Simulation under the Assignments category.
- Select Passive Resistor from the Assignment drop down box.
- Choose Pull-up or Pull-down from the Setting drop down box and click Add. Click OK.
You can turn on this option in the Assignment Editor in the Quartus II software versions 3.0 and above using the following steps:
- Open the Assignment Editor.
- In the Category bar, choose Simulation
- In the Name column, you can find the output or bidirectional pin with the Node Finder
- Select Passive Resistor from the Option column
- Under the Value column, choose Pull-up or Pull-down
This setting will model the effect of pull-ups and pull-downs.
Since this is a simulation option, you do not need to recompile the project.