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DS280DF810: How to increase the value of heo and veo?

Part Number: DS280DF810

The values of heo and veo for all channels are listed below:

finsh>>get_ch_reg(8,0x27)                                                       
ch =  0, val = 0x0d                                                             
ch =  1, val = 0x15                                                             
ch =  2, val = 0x0d                                                             
ch =  3, val = 0x17                                                             
ch =  4, val = 0x0d                                                             
ch =  5, val = 0x16                                                             
ch =  6, val = 0x08                                                             
ch =  7, val = 0x15                                                             
        0, 0x00000000                                                           
finsh>>get_ch_reg(8,0x28)                                                       
ch =  0, val = 0x37                                                             
ch =  1, val = 0x5a                                                             
ch =  2, val = 0x3e                                                             
ch =  3, val = 0x4c                                                             
ch =  4, val = 0x3c                                                             
ch =  5, val = 0x60                                                             
ch =  6, val = 0x33                                                             
ch =  7, val = 0x50                                                             
        0, 0x00000000

Eq gain and VGA gain have been set. Because there are bit errors, we should increase the value of heo and veo.

Which registers can be set to amplify heo and veo?

  • Greetings,

    Horizontal and vertical eye openings are a function of the CTLE or gain settings and signal amplitude. To optimize these two parameters, it would be a good idea to use scope and then put CDR in bypass mode. Then optimize CTLE and signal amplitude settings to provide optimum eye opening on scope.

    Regards,, nasser