Forum Post: RE: TMS320F28377D: SDFM Timing, Clock @10MHz and @20MHz

Hi Hadi, There was a bug in the TIDA-01606 firmware where the the setting of the compare values for CMPC and CMPD have been wrong (compare values higher than period register) with a 10MHz SDFM Clock resulting in no Sync situation that in fact resulted in correct measurement values. With a 20MHz clock the calculalted compare values have also been wrong but resulted in a too late Sync violating the fact that the first two SDFM filter results are invalid. So setting those compare values correct results in valid measurement also with a 20MHZ SDFM clock. Long story short: The signal timing (and quality) of the 20MHz clock has never been the root cause of the problem. Regards, Patrick