Since the VCXO values are fixed at 491.52 Mhz, and my design requires 160 Mhz for ADC and 320Mhz, can i get these values using internal clock, please guide. incase i use external clock option what are things i need to take care.
correct, with internal clock your onboard VCO needs to be an integer multiple of your target clock frequency.
With external clock the PLL is not used and the clock is distributed and divided only. These are settings that you need to set in the PLL device. Our standard reference software does already support the option to choose external clock. You can use this as a starting point.
NOTE: the input data delays for the ADC data depend on the ADC clock frequency. You may need to tune this delay value to have correct data sampling at frequencies that differ from the standard frequencies.
Best regards, Erik
over 7 years ago
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