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Invert CLKOUT setting for DDR3 ratio seed

SherryC
Intellectual 935 points

Hi all,

I am trying to get the ratio seed value for DDR3 by ratio seed excel file.

The invert CLKOUT setting follows as behind. If (DDR_CK length) < (DDR_DQS length), then use 1. If (DDR_CK length) > (DDR_DQS length), then use 0.

In my case, the DDR trace length as below:

Which invert CLKOUT setting(0 or 1) should I use?

Thanks.

Sherry

  • 0
    TI__Guru**** 170625 points

    Sherry,

    Please refer to the below e2e threads:

    http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/716/t/247633.aspx

    http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/716/t/283256.aspx

    http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/716/t/249408.aspx

    http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/717/t/159184.aspx

    http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/716/t/278888.aspx

    http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/717/t/313176.aspx

    http://e2e.ti.com/support/arm/sitara_arm/f/791/t/294190.aspx

    http://e2e.ti.com/support/arm/sitara_arm/f/791/t/342277.aspx

    http://e2e.ti.com/support/arm/sitara_arm/f/791/t/345634.aspx

    Regards,
    Pavel