AN 886: Intel Agilex® 7 Device Design Guidelines

ID 683634
Date 10/09/2023
Document Table of Contents I/O Termination

Table 83.  I/O Termination Checklist
Number Done? Checklist Item
1   Check I/O termination and impedance matching for chosen I/O standards, especially for voltage-referenced standards.

Voltage-referenced I/O standards require both a VREF and a termination voltage (VTT). The reference voltage of the receiving device tracks the termination voltage of the transmitting device. Each voltage-referenced I/O standard requires a unique termination setup.

Although single-ended, non-voltage-referenced I/O standards do not require termination, impedance matching is necessary to reduce reflections and improve signal integrity.

Intel Agilex® 7 on-chip series and parallel termination provides the convenience of no external components. Alternatively, you can use external pull-up resistors to terminate the voltage-referenced I/O standards such as SSTL and HSTL.

Differential I/O standards typically require a termination resistor between the two signals at the receiver. The on-chip differential resistor is supported whether 1.2V or 1.5V is used for true differential signaling.