Intel® Quartus® Prime Standard Edition User Guide: Debug Tools

ID 683552
Date 9/24/2018
Document Table of Contents

4.1.3. Assign Signal Probe Sources

A Signal Probe source can be any combinational node, register, or pin in your post-compilation netlist. To find a Signal Probe source, in the Node Finder, use the Signal Probe filter to remove all sources that cannot be probed. You might not be able to find a particular internal node because the node can be optimized away during synthesis, or the node cannot be routed to the Signal Probe pin. For example, you cannot probe nodes and registers within Gigabit transceivers in Stratix®  IV devices because there are no physical routes available to the pins.
Note: To probe virtual I/O pins generated in low-level partitions in an incremental compilation flow, select the source of the logic that feeds the virtual pin as your Signal Probe source pin.

Because Signal Probe pins are implemented and routed as ECOs, turning the Signal Probe enable option on or off is the same as selecting Apply Selected Change or Restore Selected Change in the Change Manager window. If the Change Manager window is not visible at the bottom of your screen, on the View menu, point to Utility Windows and click Change Manager.