Example SYSREF Frequency Calculation - 2.6 English

Zynq UltraScale+ RFSoC RF Data Converter Gen 1/2/3/DFE LogiCORE IP Product Guide (PG269)

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2.6 English

ADCSampleRate = 3.93216 GHz

DACSampleRate = 4.91520 GHz

GCD(ADCSampleRate/16 , DACSampleRate/16) = 61.44 MHz

Integer Sub - Multiple AND < 10 MHz = 7.68 MHz

These equations generate a SYSREF frequency that satisfies the requirements of the RF-ADC/RF-DAC internal clocking. The SYSREF signal is also being captured synchronously by the PL; because of this, the SYSREF frequency must also be a submultiple of the PL clock driving the IP interfaces or any other clock interacting with the PL SYSREF.