TFFE Primitive

The TFFE primitive allows you to specify a T-type flipflop with clock enable.

Note: When the ENA (clock enable) input is high, the flipflop passes a signal from T to Q. When the ENA input is low, the state of Q is maintained, regardless of the T input.

For devices that do not support clock enable, logic synthesis generates logic equations containing flipflops with clock enables. These logic equations correctly emulate the logic specified in any project.

Note: For information about Quartus^® Prime primitive instantiation, go to Using a Quartus^® Prime Logic Function.