CLK input port is not visible in my FFT megacore function v11.1

[Altera_Forum]

I am trying to do an FFT using DSP Builder's FFT megacore Function but  

the "clk input port" is not visible in my FFT megacore function v11.1  though it has been mentioned in the FFT megacore user guide as one of the signals.

[Altera_Forum]

DSP Builder doesn't expose clocks directly. It will connect it up using the clock domain of the blocks driving the FFT.