Intel® Arria® 10 Core Fabric and General Purpose I/Os Handbook

ID 683461
Date 1/21/2022
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4.2.6. Programmable Phase Shift

The programmable phase shift feature allows both fPLLs and I/O PLLs to generate output clocks with a fixed phase offset.

The VCO frequency of the PLL determines the precision of the phase shift. The minimum phase shift increment is 1/8 (for I/O PLL) or 1/4 (for fPLL) of the VCO period. For example, if an I/O PLL operates with a VCO frequency of 1000 MHz, phase shift steps of 125 ps are possible.

The Intel® Quartus® Prime software automatically adjusts the VCO frequency according to the user-specified phase shift values entered into the IP core.