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StefanoMarsi's avatar
StefanoMarsi
Icon for Occasional Contributor rankOccasional Contributor
3 years ago

CYCLONE V - HPS and I2C Peripheral Pin

Hi Community I'm testing the I2C interface embedded in CycloneV - HPS. - However, if I export peripherals signals through the HPS I/O Set everything works pretty well. - But If I switch to FPG...
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StefanoMarsi's avatar
StefanoMarsi
Icon for Occasional Contributor rankOccasional Contributor
3 years ago

Thank you for your kind answer, but unfortunately, the result is the same !

Please note that the i2C waveforms present a certain coherence but the frequency and the duty cycle are completely wrong.

Moreover looking at the RTL representation the main difference is that using the HPS pins there are no input buffers (is it possible?) for the signal and the buffers are located quite near the I2C peripheral, while if I try to drive the pins to the FPGA fabric an input buffer is added and all the buffers are located in the I/O resources.

I included a couple of images to better explain this difference.

Thank you for your support