188.8.131.52. Guideline: I/O Standards Supported for I/O PLL Reference Clock Input Pin
The I/O PLL reference clock (REFCLK) input pin supports the following I/O standards only:
- Single-ended I/O standards
Intel® Arria® 10 devices support Differential HSTL and Differential SSTL input operation using LVDS input buffers. To support the electrical specifications of Differential HSTL or Differential SSTL signaling, assign the LVDS I/O standard to the REFCLK pin in the Intel® Quartus® Prime software.