Why does the .pin file show a VREF voltage requirement against the VREFB pins when using Differential SSTL/HSTL/HSUL I/O standards in Agilex™ 7 devices?

Description

Due to a problem in Quartus® Prime Pro Edition Software version 23.2 and earlier, the .pin file incorrectly shows a VREF voltage of 0.6V against the VREFB pins when using Differential SSTL/HSTL/HSUL I/O standards in Agilex™ 7 devices. These I/O standards do not require an external VREF.

Resolution

You may ignore the external VREF voltage requirement if using Differential SSTL/HSTL/HSUL I/O standards.

This problem is fixed starting from Quartus® Prime Pro Edition Software version 24.1