TUSB212: About rising/falling time compare between bypass and redrvier.

It make sense, You can see rise/fall time in redriver mode is 10% faster than bypass mode. So it seems redriver is  boosting rising/falling edge.

regards

Brian

Hi Brian,

The report as attached seems the bypass mode is faster than the redriver mode.

Bypass mode

Redriver mode

What is your EQ setting now? Did you try other E setting?

Regards

Brian

Hi Brain,

The redriver EQ setting as below,

Bypass mode

AC L1 and DC 60mV

AC L3 and DC 60mV

ok, let me check with system.

Regards

Brian

Do we have any update from system?

Far:

   System think it all depend on incoming signal waveform. It could either make it faster or slower.

Regards

Brian

Hi Brian,

I have the debug meeting with the customer, and they ask me why the USB signal have the green circle area behavior, do you have any experience about this random jitter?

USB host is camera and receive side is SoC(qualcomm), they probing in the SoC side, is that make sense?

Could you let us know re-driver PWR if impact USB signal Jitter? do we have any ripple spec?

I send you the detail via mail.

the green one is consistent  or random?

Regards

brian

Far:

   Can you look at waveform the green part is from the 1st edge?

regards

brian

it seems consistent, can saw the green one in the all EQ setting, but w/o redriver.

Do you mean, the green one maybe the first of the USB signal? 

And do we have any ripple spec or the Vsupply 3V~3.6V is OK to redriver?