DisplayPort Intel® FPGA IP User Guide

ID 683273
Date 9/02/2022
Public

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5.8.1. Controller Interface

The controller interface allows you to control the source from an external or on-chip controller, such as the Nios II processor.

The controller can control the DisplayPort link parameters and the AUX channel controller.

The AUX channel controller interface works with a simple serial-port-type peripheral that operates in a polled mode. Because the DisplayPort AUX protocol is a master-slave interface, the DisplayPort source (the master) starts a transaction by sending a request and then waits for a reply from the attached sink.

The controller interface includes a single interrupt source. The interrupt notifies the controller of an HPD signal state change. Your system can interrogate the DPTX_TX_STATUS register to determine the cause of the interrupt. Writing to the DPTX_TX_STATUS register clears the pending interrupt event.