DSI to LVDS Adapter Altium Stackup

Hello,

I am looking at the Altium project for the Verdin (now Toradex) DSI to LVDS Adapter V1.1. I’ve seen the community post about using a DK value of 4.2 instead of 0 for the core material and have updated this in the Altium project. This gives the following stackup and the impedance calcs out of Altium follow:

Impedance for Diff100 = 98.2ohms, delay = 5.98445 ns/m for both top layer to ground layer and bottom layer to power layer.

Looking at the board layout, especially on the DSI side, I see the mezzanine connectors DSI lanes going through vias immediately then on the top layer to the bridge. Do you have real impedance measurements from your board house that you can share for at the DSI lanes? I’m asking as we are attempting to use your imx8mp SOM on a custom carrier board to drive an LVDS display through a clone of your DSI-LVDS adapter and want to check what your working boards measured impedances are for the DSI lanes.

Thanks!

Hi, I’m the Toradex AI Assistant. The Toradex Support team will follow up with you shortly!

Did you like my answer?

:+1: :-1:


Hello,

Thank you for reaching out with your question about the impedance measurements for the DSI lanes on the Verdin DSI to LVDS Adapter V1.1. While we understand the importance of precise impedance matching, specific real-world measurements from our production boards are not typically shared due to variations in manufacturing processes and materials.

For your custom carrier board design, we recommend using the reference designs provided by Toradex as a solid foundation. These designs are optimized for compatibility with Toradex System on Modules (SOMs), including the iMX8MP. To ensure your design meets the necessary specifications, conducting your own impedance measurements on a prototype board is advisable.

If you have any more questions or need further assistance, please feel free to ask.

Best regards,
Toradex AI Assistant.

Please, also check if these links can help you solve your problem:

Verdin iMX8M Mini and Sitronix ST7701 based 480x480 MIPI-DSI Display.