2.4.5. Adding Signals to the Signal Tap Logic Analyzer
Adding Pre-Synthesis Signals
You can add expected signals to Signal Tap for monitoring without running synthesis. Pre-synthesis signal names are those names present after Analysis & Elaboration, but before any synthesis optimizations. When you add pre-synthesis signals to Signal Tap for monitoring, you must make all connections to the Signal Tap logic analyzer before running synthesis. The Compiler then automatically allocates the logic and routing resources to make these connections. For signals driving to and from IOEs, pre-synthesis signal names coincide with the pin's signal names.
Refer to Adding Pre-Synthesis or Post-Fit Nodes.
Adding Simulator-Aware Signals
You can easily generate a list of simulator-aware, pre-synthesis signals to tap for an entire design hierarchy, and then observe all internal signal states in your RTL simulator. This set of simulator-aware nodes can provide full visibility into other untapped nodes in the design hierarchy. You can then export captured Signal Tap signal data data directly into your RTL simulator to observe signal states beyond Signal Tap observability.
Refer to Adding Simulator-Aware Signal Tap Nodes.
Adding Post-Fit Signals
You can add post-fit signals to Signal Tap for monitoring. Post-fit signal names are those names present in the netlist after physical synthesis optimizations and place-and-route. When you add post-fit signals to Signal Tap for monitoring, you are connecting to actual atoms in the post-fit netlist. You can only monitor signals that exist in the post-fit netlist, and existing routing resources must be available.
In the case of post-fit output signals, monitor the COMBOUT or REGOUT signal that drives the IOE block. For post-fit input signals, signals driving into the core logic coincide with the pin's signal name.
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