A feature that routes user-specified signals to output pins without disturbing the existing fitting. Once you specify which signals are routed, the SignalProbe^™ feature allows you to debug signals without completing a full compilation. This option is available for only APEX^™ 20K, APEX 20KE, APEX^™ II, ARM^®-based Excalibur^™, Cyclone^™, Stratix^™, and Stratix^™ GX devices.

Before using the SignalProbe feature, you must perform a smart compilation by turning on Smart compilation/more disk space in the Mode page under Compiler Settings in the Settings dialog box (Assignments menu). If you want to reserve a specific pin or pins for SignalProbe use, you must reserve the pin or pins before performing a smart compilation. Also, before copying a legal SignalProbe source with the Node Finder dialog box, you must specify the SignalProbe filter.

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