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Altera_Forum
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11 years ago

What is the Slew Rate VALUE of Cyclone IV?

Hi there, As the handbook tells, we can set three kinds of Slew Rate in "IO Assigment Editor" , 0,1,2, in which "0" means slowest and "2" means fastest. Is anybody knows what is the specific...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
10 years ago

Hi,

You could use the Cyclone IV IBIS model or Hspice model to do signal integrity simulation to verify the behavior of different slew rate to your setup. This will help you to select the optimal slew rate for your setup. Generally, faster slew rate you can have higher fmax but SI might degrade due to reflection. Slower slew rate you get lesser fmax but less reflection issue.