Tool/software:
Hello,
In our design, we added series capacitors to the DVI lanes to create AC-coupled TMDS signals, which are then converted to HDMI output using the SN65DP149. However, we noticed that in our schematic, Pair 2 is connected to Pair 0, and Pair 0 is connected to Pair 2 on the IC’s pinout.
We have already manufactured this board, and in the production output, we observed poor eye measurements and compatibility issues with some displays. We were able to make it work by adjusting the EQ settings. Our current configuration is:
- I2C_EN/PIN → Low
- Pre_sel → Open
- EQ_SEL → Open
- HDMI_SEL → Low
- SLEW_CTL → Open
Additionally, we sometimes observe a significant impedance drop on pins 21 and 22, and when this happens, the display does not show any image. The issue is only resolved when we replace the IC.
We are uncertain about the exact cause of these issues. Could the swapped lane connections be contributing to these problems? Do we need to update our schematic, or is it possible to continue with this design?
Thank you for your support!
