Sunday, October 12, 2014

Pitch Correction Project Update

I haven't made much progress since the last post.

  • Resolved blocking issue WRT to the simulator
  • collector and monitor complete for the adc bus and the sample_iface bus
  • started tracing the sample_in != sample_out issue

Taking a look at sample_in != sample_out

Sample going into the DUT (adc controller) vs the sample coming out

This image shows the basic error. The sample being pulled from the ADC is 0xe95 but the sample going out is 0x74A.

Individual signals showing "off by 1" error
 After looking at the signal breakdown it becomes clear that this is some kind of off by 1 error. The input sample is 0b111010010101 which is not equal to the binary sample in the above image.

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