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Cyclone V input slew rate

Honored Contributor II



I am trying to make an altlvds megafunction work, and have been running through all the possibilities where I could have gone wrong. 


The data rate is 519.75 MHz, which should be ok according to the Cyclone V handbook. 


However, I have had a look at the input transition times in the TimeQuest Timing Analyser, and it says that the input transition times for my LVDS channels(tamron_rx_in) are 2000 ps. As the data period is 1924 ps, I find this quite confusing. How can the transition time be higher than the period of allowed frequencies? 


I cannot even set this to an other value, as the Pin Planner tells me it can only be set for output pins. Does this mean that this is just a placeholder value for input ports?
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