JAJSOZ7A August 2022 – April 2024 TMDS1204
PRODUCTION DATA
Care must be taken when performing HDMI 2.1 TX compliance testing with AEQ enabled. Because the TMDS1204 will only adapt to LTP5 through 8 during the TXFFE0 part of link training, it is important the test equipment initiate a FRL link training before performing any TX measurements, especially TX eye and jitter measurement. After completion of FRL link training, the test equipment can then switch the current pattern (LTP5, LTP6, LTP7, or LTP8) to the desired test pattern (LTP1, LTP2, LTP3, or LTP4). If the test equipment request LTP1, LTP2, LTP3, or LTP4 before initiating link training, the TMDS1204 will use the sampled state of EQ[1:0] pins.
The following HDMI 2.1 TX tests use LTP5, LTP6, LTP7, and LTP8 as the required pattern for the measurement: HFR1-1, HFR1-2, HFR1-4, HFR1-7, and HFR1-8. If the TMDS1204 AEQ adaption has not completed and instead uses sampled state of EQ[1:0] pins, then it is possible these tests may fail or inaccurately represent system performance.