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Altera_Forum
Honored Contributor
Honored ContributorCyclone EP1C20 slew rate
Where can I find the slew rate(rise time/fall time) of EP1C20F400c8 Looked in the cyclone family data sheet. could not find it. I want to reduce the slew rate from default to something slower.
Altera_ForumHonored Contributor
Honored ContributorRefer to the IBIS specification http://www.eigroup.org/ibis/specs.htm
The [Ramp] values are calculated from the above rising and falling waveform tables, which are almost self-explanatory, I think. Please notice the voltage terminated 50 ohm load ("R_fixture","V_fixture") which possibly reduces the output swing below the specifications of the respective I/O standard. But the effect of the "Slow Slew Rate I/O" setting can be clearly seen.
