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Next, 1V2. This is the 1.2V domain that runs the Ethernet PHY, as well as the MGTAVTT rail for the FPGA transceivers.

We can see some 250 MHz activity from the PHY as well as spiky broadband noise around 500-600 MHz from the switching spikes.

This is where it should be voltage wise (1.1996V) but noisier than I want: 31.63 mV p-p / 0.96 mV RMS. Spec for the GTX is, again, 10 mV p-p.