TUSB1104: Enabling USB 3.2 Gen 2 x2 (20Gbps) not working

Dharrvindra V Parthepan

Part Number: TUSB1104

Hi TI,

We are able to detect 10Gbps using the TUSB1104 when unpaired the USB pair signals from PCH via BIOS (Alderlake -S).

But we are not able obtain 20Gbps when USB signals are paired. (even 10Gbps is not detected). Could you advise on how to enable 20Gbps?

ADHC_S111_TUSB1104.pdf

Thank you.

Best Regards,

Dharrvin

over 1 year ago

0 David (ASIC) Liu over 1 year ago

TI__Guru*** 149885 points

Dharrvin

What is being connected at the Type-C connector? Is it a device that is capable of USB3.2 x 2 as well?

Do you have a USB protocol analyzer log file that can help debugging this issue?

Thanks

David

0 Dharrvindra V Parthepan over 1 year ago in reply to David (ASIC) Liu

Prodigy 20 points

Hi David,

Im using the Kingston XS2000 with USB 3.2 Gen 2x2 USB-C Cable.

Thank you.

Best Regards,

Dharrvin

0 David (ASIC) Liu over 1 year ago in reply to Dharrvindra V Parthepan

TI__Guru*** 149885 points

Dharrvin

Can you please probe the termination on TX1/2 and RX1/2 on both sides of TUSB1104? When TUSB1104 powers up and sees termination on both TX1/RX1 and TX2/RX2, it will be in USB3.2 Gen 2 x 2 mode with CONFIG/Non-CONFIG lane determined by the FLIP driven by the PD controller.

Once in USB3.2 x 2 mode, and if there is no activity on the non-config lane. the TUSB1104 will disable it to save power which then becomes USB3.2 Gen 2 x 1 mode.

Thanks

David

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TUSB1104: Enabling USB 3.2 Gen 2 x2 (20Gbps) not working