Video stream forwarding is handled by the forwarding control in the DS90UB954-Q1 on FWD_CTL1 register 0x20. The forwarding control pulls data from the video buffers for each FPD-Link III RX port and forwards the data to the CSI-2 output interfaces. It also handles generation of transitions between LP and HS modes as well as sending of Synchronization frames. The forwarding control monitors each of the video buffers for packet and data availability.

Forwarding from input ports may be disabled using per-port controls. Each of the forwarding engines may be configured to pull data from either of the two video buffers, although both buffer may only be assigned to one CSI-2 Transmitter at a time unless in replicate mode. The two forwarding engines operate independently.