What are the important settings for SDI-SD standard video communication? I use the IP-SDI-II up to SDI-HD and it works properly, but it does not work with SDI-SD. How can I generate a correct differential signal for SDI-SD standard?

Hi Bryan,

Sorry for the delay. I has been out for the past week. Regarding your latest inquiries, as I understand it, generally VCXO is required for clock cleaning before feeding into the TX as XCVR refclk. Yes, your understanding is correct, for VCXO, you would need to build your own logic to control the voltage input. You may further refer to your VCXO vendor on the controls required.

For your information, you may also try to refer to the following AN on example design for AV and SV which use VCXO. If I understand it correctly, the example design has some VCXO control logic which you may refer. However, please refer to your VCXO vendor for further details. The design also uses some loopback FIFO for re-transmit which you may refer to as well.

https://www.intel.cn/content/dam/www/programmable/us/en/pdfs/literature/an/an668.pdf

Note that I am unable to locate any CV example design for SDI II with external VCXO. Hopefully the AV and SV examples will be helpful.

Please let me know if there is any concern. Thank you.

Best regards,

Chee Pin