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AM625: TEST POINT ON LPDDR/DDR LINES

Paul Nwoko
Prodigy 105 points
Part Number: AM625

Tool/software:

Hello TI Experts,

I'll like to know, is it advisable to put test points on lpddr4 lines for debugging purposes?

Expecting your response. Thank you.

Regards,

Paul.

  • 0
    TI__Guru* 76430 points

    Absolutely not, this may introduce unwanted stubs on the high speed signals, causing signal integrity issues. 

    Regards,

    James

  • 0 in reply to JJD
    Prodigy 105 points

    Alright.

    So how do I troubleshoot/test the interface during bring up?  How do I view on a scope, the signal transition on the clock and reset lines to debug DDR initialization related issues?

    Regards,

    Paul.

  • +1 in reply to Paul Nwoko
    TI__Guru* 76430 points

    Typically customer work with the memory vendors to install interposers between the memory and the board.  This can give you access to the signals that do not have test points.   Clock and reset do have resistors/caps connected, so you can tap into those probe points.  You can also typically access the embedded signals by locating associated vias on the board.

    Regards,

    James