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DS125DF410: DS125DF410 - What is meaning of HEO and VEO from 0x27, 0x28 register?

Jade Goo
Intellectual 1940 points
Part Number: DS125DF410

Hi Team,

DS125DF410 support eye monitoring feature thru 0x27 and 0x28 register.
If customer want to check channel 0 eye-diagram, they have to write below register.

0xFF 0x04 - Read target chaneel 0
Read 0x27 - HEO value
Read 0x28 - VEO value

What is meaning of 0x27 and 0x28 register value and how can covert these value?
Thank you.

Best Regards,
Jade

  • 0
    TI__Mastermind 43795 points

    Hi Jade,

    The VEO value must be multiplied by the Voltage range setting in register 0x29 to determine the eye height in mV.

    For setting 00'b the eye opening is 3.125mV per LSB in the HEO register.

    Setting 01'b=6.25mV,  Setting 10'b=9.375mV, and Setting 11'b=12.5mV 

    The HEO value is multiplied by 1/64 to determine the horizontal eye opening in UI.

    Regards,

    Lee