DFFE Primitive

The DFFE primitive allows you to specify a D-type flipflop with clock enable.

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

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

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