colossus_bade
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The typical AC couple cap is 75~200nF in some specs(PCIE, USB3, SATA,...), and the high-pass corner formed by the AC-couple cap & termination resistor is relatively now, so I guess they wont specify the droop rate in the spec (it wont happen with this large ac-couple cap). But if you put your own ac couple capacitor in your silicon (typically much smaller than the spec value), you will worry about the droop of the signal, and the droop rate wont be specified in the spec (because it's caused by your specific design, not the spec)
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