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AR# 68208

HDCP 1.x v1.0 - Why is there a restriction saying that HDMI and DisplayPort can not be used on the same platform design?

Description

Why is there a restriction saying that HDMI and DisplayPort cannot be used on the same platform design?

See HDCP 1.x v1.0 Product Guide (PG224) Page 41 under Restrictions and Limitations.

Solution

The problem is with the software driver. The driver read/writes from the DPCD interface of the DisplayPort and the DDC registers of the HDMI using a port interface. 

The port interface is common, but the functions for HDMI and DisplayPort are implemented separately. The port interface is mapped to these underlying functions.

If both the HDMI and DisplayPort are present in the design, then there is a conflict where the top level port interface functions are mapped to the functions of both HDMI and DisplayPort.

Users can work around this by running DisplayPort and HDMI on two separate platforms, such as two separate MicroBlaze instances.

Linked Answer Records

Master Answer Records

Answer Number Answer Title Version Found Version Resolved
42166 HDCP 1.x - Release Notes and Known Issues for the Vivado 2013.1 tool and later versions N/A N/A
AR# 68208
Date Created 11/10/2016
Last Updated 11/11/2016
Status Active
Type General Article
IP
  • HDMI
  • DisplayPort