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TUSB546A-DCI: Does the reset value of 0000 0000 for bits 7:0 mean that DP0 and DP1 have an EQ value of 0db (for register 0x10)?

Lauren Mayfield
Expert 7180 points
Part Number: TUSB546A-DCI

Regarding the 0x10 register, does the Reset value of 0000 0000 for bits 7:0 mean that DP0 and DP1 have an EQ value of 0dB?

I am getting some video artifacting / screen tearing when sourcing 2 lanes of DisplayPort video over my TUSB546A-DCIRNQR, and when I set register 0x10 to 0xFF (1111 1111 for bits 7:0) it appears to make it worse, until I set it back to 0x00 (0000 0000 for bits 7:0).

 

I believe I am getting insertion loss problems, so I imagine putting it to 0xFF should make it better not worse. I just don’t know if 0xFF corresponds to the max DB EQ gain of 14.4 or the min EQ gain of 1.0 (?)

 

  • 0
    TI__Guru 64326 points

    Hi Lauren,

    0xFF would correspond to max EQ gain. Raising EQ so high can cause issues due to over-equalization, I suggest increasing the EQ setting incrementally. Also keep in mind that you should let the DP link retrain for new EQ settings to ensure the DP source and sink PHY are set correctly. 

    Reset value selects a EQ setting reflecting the state of the DPEQ pins assuming EQ_OVERRIDE=1 without any change to the DPxEQ_SEL bits. In other swords as reset the DPxEQ_SEL bits should reflect the pinstrap settings of the DPEQ pins.