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Measurement of USB eye diagram

sam lai
Prodigy 210 points

Dear All : 

I need to measure the eye diagram on C5535 platform. (USB 2.0)

I found the TESTMODE register in C5535 spec. 

And I want to test the TEST_PACKET mode. 

Can anyone tell me what is the 53-byte data???

  • 0
    TI__Mastermind 23785 points

    As stated in the description section, this test package is defined by USB Specification 2.0. If you refer to the USB 2.0 Specification, it is documented in section 7.1.20.

    Regards.

  • 0 in reply to Steve Tsang
    TI__Mastermind 23785 points

    As I read your posting further, I might not have answered you posting. Have you been able to scope the package sent by this mode? At the mean time, I will ask among my colleagues for more information.

    Regards.

  • 0 in reply to Steve Tsang
    Expert 2515 points

    You can use below test packet for USB eye diagram verification. You need to load this into EP0 FIFO and enable TEST_PACKET bit. USB controller will take care of sending data on the bus continuously.

    {0x0000, 0x0000, 0x0000, 0x0000, 0xAA00, 0xAAAA,

    0xAAAA, 0xAAAA, 0xEEAA, 0xEEEE, 0xEEEE, 0xEEEE,

    0xFEEE, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF,

    0x7FFF, 0xDFBF, 0xF7EF, 0xFDFB, 0x7EFC, 0xDFBF,

    0xF7EF, 0xFDFB, 0x007E};

    - Pratap