Honored Contributor
Honored ContributorYou must cascade each inverter with an LCELL primitive insertion. Then you must set the Remove Redundant Logic Cells option to OFF for the top level design.
BTW - another design for self oscillator is the RC + schmitt trigger input on MAX II. The MAX II dev kit has pads for an RC network to connect to the MAX II input for oscillator behavior. The freq depends on the RC value and threshold points fo for the MAX II schmitt trigger input. I can't remember what those were or what you get, but you can experiment with it. The equation is written in some schmitter trigger RC write-ups. http://www.fairchildsemi.com/an/an/an-140.pdf Also check the MAX II dev kit datasheet for schmitt trigger RC.
