Prefered way to pause calculation

[FranzForstmayr]

Is there a prefered way to pause a calculation?

For inserting a cyclic prefix of an ofdm transmission I need to stop the fft for a certain time after a calculation finishes.
For example I'm using a FFT64, with SPCC=4, so 16 cycles are needed. The cyclic prefix length is 16 too, so i delay the next frame by four clock cycles and send another i_start signal.
However, the output does not look like, if the delayed i_start is accepted.

See this image, two data frames with an zero frame in between, for better visibility.

The output stream, the zero frame in between is not visible anymore.

Is the i_first signal intended to be used as a start signal for each frame, or is it used just once, and the algorithm picks always the next N samples, regardless of the ì_first` signal?

[benreynwar]

Didn't notice this issue go past my email. Sorry about that. It's intended to be used at the start of each frame. It may be that you've found at bug. I'll look into this.

[khristianjones]

Pinging this, was this issue solved?