The Show SSN Analyzer Results command displays the pin placements in the design, and overlays them with a color representing the amount of simultaneous switching noise (SSN) as compared to limits you can adjust in the SSN Settings dialog box.
Green overlays represent pins that have an SSN that is below the warning threshold, yellow overlays represent SSN that is below the critical threshold, and red overlays represent SSN that is above the critical threshold.
By default, the color overlay shown for a pin depends on the worst case SSN as a percent of signal margin for both quiet low voltage (QL) and quiet high voltage (QH) SSN analyses.