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TUSB8042A: Only one Port is working out of 3 ports

b manohar
Prodigy 40 points
Part Number: TUSB8042A

Hi,

We are Using TUSB8042A Hub IC and We want to use 3 Downstream Ports (port1:- USB3, Port2:- USB3, Port3:- USB2) out of 4 Downstream Ports provided in Hub, but only Port2 is working and other 2 ports are not detecting, attaching a schematic for reference.

We are not using any communication interface (I2C or SMBUS) and Hub ic is in default configuration mode.

Do we need to configure the Hub IC to be able to work in multi-port mode?

By default, it should work As the default configuration of USED[3:0] = 1111 

Please Suggest 

    4606.Hub_schematic.pdf

  • 0
    TI__Guru 60865 points

    Hello,

    Please confirm that

    • A 24 MHz crystal is being used, not 12 MHz.
    • There is a good thermal pad connection under the hub.
    • There are caps in the SSTX lines.
    • There is adequate USB VBUS supplies to the downstream ports (budget: 1A per USB 3.0 port, 500 mA per USB 2.0 port)
    • If there is no external signal driving GRSTz, do not install a pulldown resistor on the pin, just use the capacitor.

    Regards,

    JMMN

  • 0 in reply to JMMN
    Prodigy 40 points

    Hi,

    We are using a 24MHz Crystal and we have a good thermal pad connection.

    Yes, 0.1uf capacitors are mounted on SSTX lines, both upstream and downstream side

    We are giving a 5V supply from the external source and there is a 4A Efuse to protect the downstream ports 

    Regarding GRSTz: We have tested both the ways, but the performance is the same

    1. removed the resistor and capacitor on GRSTz

    2. By driving the external signal on GRSTz

  • 0 in reply to b manohar
    TI__Guru 60865 points

    What operating system is being used?  Can you confirm that both USB 2.0 and USB 3.0 speed devices can be seen on Port 2?  How many units are you seeing this issue on?

    Regards,

    JMMN

  • 0 in reply to JMMN
    Prodigy 40 points

    We are using Linux Ubuntu

    We have connected both USB2 & USB3 device to Port2 at a time using an external USB Hub and we are able to see both the devices

     We have assembled this IC in two boards and both have this issue.

  • 0 in reply to b manohar
    TI__Guru 60865 points

    Please check your connector layout and confirm that VBUS is available on all the downstream ports.

    Regards,

    JMMN

  • 0 in reply to JMMN
    Prodigy 40 points

    Hi,

    We have found the issue, Hbub IC is working fine.

    The issue is that we have used a custom cable and connector for Port 1 and Port 3 where TX is going to TX instead of RX.

    Thanks for your support.

    --Manohar 

  • 0 in reply to b manohar
    TI__Guru 60865 points

    Glad you found the issue!  

    Regards,

    JMMN