AN 886: Intel® Agilex™ Device Design Guidelines

ID 683634
Date 8/26/2022
Public
Document Table of Contents

6.3.2.4. I/O Termination

Table 84.  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 an 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™ 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 termination resistor must match the differential load impedance of the signal line. Intel® Agilex™ devices provide an optional on-chip differential resistor when using 1.5V True Differential Signaling.

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