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DS125BR820: The link doesn't work well.(cannot find the PCIE device) with DS125BR820

Part Number: DS125BR820

Hi team,

My customer is using the DS125BR820 for PCIE3.0. The link doesn't work well.(cannot find the PCIE device) Could you please help double check the registers?  Many thanks.

0x0:0x10

0x1:0x0

0x2:0x0

0x3:0x0

0x4:0x0

0x5:0x0

0x6:0x18

0x7:0x1

0x8:0x0

0x9:0x0

0xa:0x0

0xb:0x70

0xc:0x0

0xd:0x0

0xe:0x0

0xf:0x0

0x10:0xae

0x11:0x80

0x12:0x0

0x13:0x0

0x14:0x0

0x15:0x0

0x16:0x0

0x17:0xae

0x18:0x80

0x19:0x0

0x1a:0x0

0x1b:0x0

0x1c:0x0

0x1d:0x0

0x1e:0xae

0x1f:0x80

0x20:0x0

0x21:0x0

0x22:0x0

0x23:0x0

0x24:0x0

0x25:0xae

0x26:0x80

0x27:0x0

0x28:0x4c

0x29:0x0

0x2a:0x0

0x2b:0x0

0x2c:0x0

0x2d:0xae

0x2e:0x80

0x2f:0x0

0x30:0x0

0x31:0x0

0x32:0x0

0x33:0x0

0x34:0xae

0x35:0x80

0x36:0x0

0x37:0x0

0x38:0x0

0x39:0x0

0x3a:0x0

0x3b:0xae

0x3c:0x80

0x3d:0x0

0x3e:0x0

0x3f:0x0

0x40:0x0

0x41:0x0

0x42:0xae

0x43:0x80

0x44:0x0

0x45:0x0

0x46:0x38

0x47:0x0

0x48:0x5

0x49:0x0

0x4a:0x0

0x4b:0x0

0x4c:0x0

0x4d:0x0

0x4e:0x0

0x4f:0x0

0x50:0x0

0x51:0x85

0x52:0x0

0x53:0x0

0x54:0x0

0x55:0x0

0x56:0x10

0x57:0x44

0x58:0x21

0x59:0x0

0x5a:0x54

0x5b:0x54

0x5c:0x0

0x5d:0x0

0x5e:0x0

0x5f:0x0

0x60:0x0

0x61:0x0

  • Hi Frank,

    There isn't anything in the registers which indicates a problem.

    The equalization is set to minimum

    VOD is set to the recommended level and DEM is set to 0dB.

    This is a good place to start.  I see that the DS125BR820 has detected receiver terminations on all of it's outputs.  This will correctly enable the DS125BR820 input terminations for all channels.

    Do you have any more information on the application? 

    Is the DS125BR820 powered up at the same time as the rest of the system?

    Is there a DS125BR820 redriver on both upstream and downstream datapath directions?

    Thanks and Regards,

    Lee

  • Hi Lee,

    Thanks for your reply. i have let the customer check the difference between current board and previous Gen board. Thanks.