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We need your help with AM1810 pin problems!

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Hi Professionals! My team met a problem again. On our AM1810 developer board, we are going to  provide digital clock signal excitaion for FPGA chip by digital output of pin of CLKOUT/UHPI_HDS2/PRU1_R30[13]/GP6[14]. After our configuration on AM1810 board, we used oscillometer AC block to test output of this pin and result is a 24MHz triangle wave with an amplitude of ~2V. But we are wondering: should the waveform have been square wave, instead of triangle wave? Actually we hope it is square wave. Please help us analyse it. Thank you very much. 


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