Hi Samuel, This seems strange, if you are indeed sending a sync pulse into the pfb, it should return out after some delay. I would recommend the sync_out of the pfb attached to the enable of a counter attached to a software register and/or a 'To Workspace.' This should tell you for certain.
Mark On Thu, Mar 10, 2011 at 8:45 PM, Samuel Tun <samuel....@gmail.com> wrote: > Hi there, > > Thanks to the various recommendations on this archive I have been able > to compile an f-engine design for a ROACH board running at 250 MHz for > a 1 GHz signal off the ADC. In testing the actual calculations along > the data flow I found that, although my sync generator logic emits a > sync pulse regularly, as expected, the corresponding sync pulse never > comes out of the pfb sync_out pin. That is, the sync_gen signal is > pretty regular in my scope's plot, but the data coming out of the pfb > sync_out always remains at zero, even though I see the actual data > coming out of the pfb with the appropriate delay. > > Am I wrong in thinking that I should be seeing the delayed syng_gen > pulse out of the pfb? > > thanks, > Sam Tun > >
