VCO Frequency and MF Value - 2023.2 English

H.264/H.265 Video Decode Unit Solutions LogiCORE IP Product Guide (PG414)

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2023.2 English

The VCO operating frequency can be determined by using the following relationship:

fvco = frefclk × M


fclkout = fvco / O

where, M corresponds to the integer feedback divide value and O corresponds to the value of output divide.

Note: The PLL does not support fractional divider values.
Important: Select the PLL feedback multiplier value based on the supported VCO frequency range (fvco).

Refer to the Versal AI Core Series Data Sheet: DC and AC Switching Characteristics (DS957) for more information on the operating range of fvco.

Select the output divider (O) based on the required core clock or MCU clock frequency.