6.4. Link Training Procedure
Sink will always request link training pattern 0x5678. These link training patterns start with 4 Scrambler Reset (SR) characters followed by 4096 encoded and scrambled data. After receiving the SR characters, the HDMI RX core achieves alignment and lane deskew lock to qualify the received link training pattern.
After detecting the pattern, sink will set link training pattern 0x0000 indicating link training passed.