SLLA611 september 2023 TDP1204
The TDP1204 supports both linear and limited redriver modes. However, the transmitter pre-emphasis and de-emphasis control is only supported in limited mode for HDMI 1.4 or HDMI 2.0. When the TDP1204 is operating as an HDMI 2.1 redriver pre-emphasis implementation is not available and only the de-emphasis is modified by the device based upon the DDC TXFFE snooped value. Since the pre-emphasis implementation is not available when operating as an HDMI 2.1 redriver, care must be taken while running HDMI 2.1 compliance testing to make sure that the pre-emphasis tests are not inadvertently selected. Therefore, running the pre-emphasis tests while using TDP1204 as an HDMI 2.1 redriver causes HDMI 2.1 compliance testing to report failures.