SNLS543 August 2018 DS90UH949A-Q1
In Dual Link mode, the FPD-Link III TX splits a single video stream and sends alternating pixels on two downstream links. If HDCP is enabled, a single HDCP connection is created for the video that is sent on the two links. The receiver must be a DS90UH948A-Q1 or DS90UH940A-Q1, capable of receiving the dual-stream video. Dual link mode is capable of supporting an HDMI clock frequency of up to 210 MHz, with each FPD-Link III TX port running at one-half the frequency. This allows support for full 2K video. The secondary FPD-Link III link could be used for high-speed control.
Dual Link mode may be automatically configured when connected to a DS90UH948A-Q1/DS90UH940A-Q1, if the video meets minimum frequency requirements. Dual Link mode may also be forced using the DUAL_CTL1 register.
For dual lane operation, if the High-Speed Control Channel (HSCC) is desired, force the back channel capabilities for Port 1.
Any device configuration including this one should be written as a part of the 949A Init A sequence as shown in Figure 33