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USB-REDRIVER-EVM: USB-REDRIVER-EVM about the rate issue

Mickey Zhang
Genius 12080 points
Part Number: USB-REDRIVER-EVM
Other Parts Discussed in Thread: TUSB501

Hi Team,

The customer is using USB-REDRIVER-EVM.  He uses the EVM board to establish the connection between his computer and the U disk.

The P3 interface of the EVM board is connected to  the USB3.0 interface of  the computer. The P2 interface of the EVM board is connected to the U disk. The U

disk is USB3.0 interface output. The customer's computer is WIN10 64bit. In this case, the transmission speed of the U disk is only 40MB/S.

But if the customer connects the U disk to the USB3.0 interface of the computer directly, the transmission speed of the U disk can reach 130MB/S.

The customer has tried these two cases on different computers, but the result is the same as the above.

Q1: Can you explain why the transmission speed of the U disk is different in the two cases?

Q2: Is the transmission speed of the U disk  40MB/S normal when the EVM board is connected to the USB3.0 interface of  the computer?

If it is normal, is it possible that the EVM board is damaged when the customer purchases? Or any other reasons?

Best Wishes,
Mickey Zhang
Asia Customer Support Center
Texas Instruments

  • 0
    TI__Mastermind 36085 points

    Hello Mickey,

        Seems that the customer needs to configure the EQ settings. The re-driver may be over equalizing the signal and thus, the device is not able to connect on USB3. Please use the USB view software to confirm whether the USB device is connecting over USB3 or USB2.

    Regards,

    Diego.

  • 0 in reply to Diego Cortes
    TI__Genius 12080 points
    Hi Diego,

    Thank you for your reply.

    Q1: How to confirm whether the USB device is connecting over USB3 or USB2 by USB view software? Would you please explain more specifily?

    Q2: The customer cannot find the descriptions of the EQ settings from EVM User's Guide. Do you have the documentation for the descriptions of the EQ settings? Does the customer need to weld for this test?
  • 0 in reply to Mickey Zhang
    TI__Mastermind 36085 points

    Hi Mickey,


         The tool will show a USB tree, where you can find the device, once you select a device the SW will shouy you its attributes, including the buss speed.

        In order to configure the EQ settings the customer only has to populate the resistors connected to the EQ pins, please see the schematic included in the user's manual and the EQ description in the TUSB501's datasheet.

    Regards,

    Diego.

  • 0 in reply to Diego Cortes
    TI__Genius 12080 points
    Hi Diego,

    Q1: For the EQ settings, you mean the customer can only connect a pull up resistor or a pull down resistor to the EQ pins,right?

    Q2: The customer suspects that this is the driver compatibility issue. Do we have the USB3.0 test platform? Or if not, can you

    recommend a USB3.0 test platform which include the PC host model, Tthe motherboard model and so on?

    If this is the driver compatibility issue, can you give me some suggestions?
  • 0 in reply to Mickey Zhang
    TI__Mastermind 36085 points
    Hello Mickey,

    The EQ settings can be configured as High (fpull-up), Floating (not connect) or low (pull-down). It is also possible to configure the output swing and signal De-emphasis. Please see the Table 1 in the datasheet, page 3 for a detailed descripton.

    It is not likely to be a compatibility uissue, the recomended board is any with an intel USB3 host.

    It is highly recommended to run a signal integrity test in order to know how to configure the redriver and achieve the best compenzation.

    Regards,
    Diego.