TUSB1046-DCI: Maximum trace length for DP1.4 signal

Roy Hsu

Part Number: TUSB1046-DCI
Other Parts Discussed in Thread: TUSB1046A-DCI

Hi Team,

According to this App. Note, the maximum pre-channel trace/ post-channel trace for USB3.1 Gen 2 supported by the TUSB1046A-DCI is 6 inches/ 4 inches.

What about for DP1.4 signals? What are the maximun pre-channel and post-channel trace supported by this device?

Thanks!
Roy Hsu

over 5 years ago

0 David (ASIC) Liu over 5 years ago

TI__Guru**** 176721 points

Roy

Post-channel will follow the USB3.1 Gen 2 recommendation, to be around 4in.

For pre-channel, we can equalize or compensate up to 14dB loss at the Nyquist frequency of 4.05GHz.

Thanks

David

0 Roy Hsu over 5 years ago in reply to David (ASIC) Liu

TI__Genius 9390 points

Hi David,

I guess that translates to 19 inches (14/0.7342)?

Thanks!

Roy Hsu

0 David (ASIC) Liu over 5 years ago in reply to Roy Hsu

TI__Guru**** 176721 points

Roy

It would depend on the PCB material and its dielectric constant. But assuming 0.7342dB/in loss, then ~19in would be the max theoretically calculated length. But once you add the loss from the via, the connector, the package, etc., the trace length will be less than the 19in.