TUSB1046-DCI: 1 Lane Displayport

Joe Nguyen1

Prodigy 185 points

Part Number: TUSB1046-DCI

Tool/software:

Can the TUSB1046-C be configured for USB 3.1 + 2 lane DP, but use only 1 lane DP?

7 months ago

0 Joe Nguyen1 7 months ago

Prodigy 185 points

I believe this this answers my question

https://e2e.ti.com/support/interface-group/interface/f/interface-forum/1031342/tusb1046a-dci-single-lane-displayport

+1 David (ASIC) Liu 7 months ago in reply to Joe Nguyen1

TI__Guru**** 176811 points

Hi,

By default the TUSB1046-DCI will be configured as USB3.2 + 2 DP Lanes or 4 DP lanes. If the TUSB1046-DCI AUX snooping is enabled, then the TUSB1046-DCI will automatically drop into 1 lane DP when the source and sink negotiate for 1 lane DP over the AUX communication. In the TUSB1046 I2C mode, you can also manually disable AUX snooping and then enable only one lane (lane 0). But please keep in mind that if the source and sink are configured in 4 DP lanes, and TUSB1046-DCI is manually configured in 1 lane DP, it will cause DP link training to fail since sink will not able to receive data on 3 lanes (Lane 1, 2, and 3).

Thanks

David

0 Joe Nguyen1 7 months ago in reply to David (ASIC) Liu

Prodigy 185 points

Thank you for the detailed response. If we are the source, can I leave the unused DP input lanes floating?

0 David (ASIC) Liu 7 months ago in reply to Joe Nguyen1

TI__Guru**** 176811 points

Hi,

Yes, you can leave unused DP input lanes floating.

Thanks

David

0 Joe Nguyen1 6 months ago in reply to David (ASIC) Liu

Prodigy 185 points

Do I only need to route RX2 and RX1 to the Type-C connector for DP0?

0 David (ASIC) Liu 6 months ago in reply to Joe Nguyen1

TI__Guru**** 176811 points

Hi,

Yes, this is correct.

Thanks

David

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TUSB1046-DCI: 1 Lane Displayport