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SDFM Data rate is not constant!

Other Parts Discussed in Thread: CONTROLSUITE

Hi Guys,

CCS v 6.2(compiler version = TI v15.12.3.LTS)

TMX320F28075 Control Card

control Suite v 3.4.1

Example Program Used : ..\controlSUITE\device_support\F2807x\v200\F2807x_examples_Cpu1\sdfm_filters_sync_cpu

SDFM1 Settings:

- Only FILTER1 is enabled.

- SINC2, OSR_200, SHIFT_1_BITS

- AE_ENABLE

According to TRM the time for Data rate = 20us (@10MHz SDCLK). So I made a GPIO to toggle inside the SD1_ISR and got the following picture:

As you can see here, the time is not exactly 20us. Is this normal or am I doing something wrong?