SNLS477B October 2014 – November 2018 DS90UB948-Q1
I2S audio may be fanned-out and propagated in the repeater application. By default, data is propagated via data island transport on the FPD-Link interface during the video blanking periods. If frame transport is desired, connect the I2S pins from the deserializer to all serializers. Activating surround sound at the top-level serializer automatically configures downstream serializers and deserializers for surround-sound transport utilizing data island transport. If 4-channel operation utilizing I2S_DA and I2S_DB only is desired, this mode must be explicitly set in each serializer and deserializer control register throughout the repeater tree (Register Maps).
A DS90UB948-Q1 deserializer configured in repeater mode may also regenerate I2S audio from its I2S input pins in lieu of data island frames. See Figure 27 and the I2C Control Registers (Register Maps) for additional details.