TUSB1142: default pin configuration

Hi,

How much is the loss of this 6ft cable? The max insertion loss for the cable for USB3.2 Gen 2 10Gbps is 6dB which is around 1m in length. Does this cable have better loss that the 6dB?

Thanks

David

No idea what the end user cable length or loss will be. I was hoping to use the PIN config function of the TUSB1142 part. Is there a pin config that works best in most cable scenarios? I am connecting the TUSB1142 between my USB3.2 HUB and a USB-C connector.

thanks

Hi,

Please see this simplified block diagram for reference,

TUSB1142 can only provide linear re-driver function on the TX path, it does not have TX SWING or Pre-/De-emphasis to compensate for the cable loss. So the compensation for the cable loss has to come from the hub itself. But a USB3.2 compliant hub will only work with a cable that has 6dB loss at 10Gbps as defined by the USB spec. If the cable loss is outside the -6dB loss, then the data rate will drop from 10G to 5G.

Thanks

David

David,

thank you for the reply,

This is the first USB 3.2 and USB-C project i have ever worked on. Gaining knowledge as fast as i can. 

this is excellent information. Can you suggest a better part from TI to use? I considered the USB C switch only part , is there a better part for a USB 3.2 hub to USB-C offboard connector scenario?

Thanks,