Cyclone® V Device Handbook: Volume 1: Device Interfaces and Integration

ID 683375
Date 10/18/2023
Document Table of Contents

5.10.1. Single-ended I/O Termination

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

The supported I/O standards such as SSTL-125, SSTL-135, and SSTL-15 typically do not require external board termination.

Intel recommends that you use OCT with these I/O standards to save board space and cost. OCT reduces the number of external termination resistors used.

Note: You cannot use RS and RT OCT simultaneously. For more information, refer to the related information.
Figure 91. SSTL I/O Standard TerminationThis figure shows the details of SSTL I/O termination on Cyclone® V devices.

Figure 92. HSTL I/O Standard TerminationThis figure shows the details of HSTL I/O termination on the Cyclone® V devices.