Intel® MAX® 10 General Purpose I/O User Guide

ID 683751
Date 1/27/2022

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2.4.1. Voltage-Referenced I/O Standards Termination

Voltage-referenced I/O standards require an input reference voltage (VREF) and a termination voltage (VTT). The reference voltage of the receiving device tracks the termination voltage of the transmitting device.
Figure 9. HSTL I/O Standard Termination

Figure 10. SSTL I/O Standard Termination