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PPI_FS2 and PPI_FS1 are not synchronous

Question asked by Navy on Jan 31, 2013
Latest reply on Feb 5, 2013 by Prashant

PPI.bmp

As the picture shows, PPI works at internal frame synchronization mode.

Timer0 and timer1 has the same configuration:400 clocks period, 4 clocks width,PWM_CLK is active.

PPI_COUNT = 20-1; PPI_FRAME = 1;

When I use PPI_FS1 only(PPI_CONTROL = 0x780E) ,the communication is all right,

When I use PPI_FS1 and PPI_FS2(PPI_CONTROL = 0x781E) ,the DATA are still right,but PPI_FS2 and PPI_FS1 are not synchronous,why?

BF537 and FPGA use different crystal oscillator, will it be the reason?

 

                                        I am looking forward to your answers. Thanks

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