Hello, Matt-san
Sorry for my delay.
I have confirmed that phenomenon on your evaluation board.
1. Run any script except MUX mode.
2. Write any value(for example 0xAA) to Tx Test Map, 0xC4[7:0]
3. Read Tx Main Map, 0xC4[7:0] then you can see 0xAA on Tx Main Map, 0xC4[7:0]
Could you evaluate above on your evaluation board and let me know your comment?
For your information, the opposite process(Tx Main Map, 0xC4[7:0] --> Tx Test Map, 0xC4[7:0]) is no problem.
Best regards.
Kikka
