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DS100DF410: A problem about signal qualty of 10Gbe become poor

leo xue
Expert 1595 points
Part Number: DS100DF410
Other Parts Discussed in Thread: DS125DF410

Hello,

    We are using  Retimer DS125DF410 as the SerDes repeater.  Now a small part of packets are lost in 10G serdes application. Please refer to the detailed design as below:

DS125DF410 is between SFP+ and Ethernet SWITCH IC flowing from SFP+ to Switch IC. 

It includes three connectors and about 4500mil to 6500mil in length from SFP+ to Retimer DS125DF410.
Eye diagram is good before DS125DF410 and become very poor after DS125DF410 treatment.  Attached photo is as below. 
We  guess that DS125DF410 output will become poor if Equalizer configured too high meanwhile the input signal quality is good. Is that possible?
So would you please advise recommended registers configuration value according to this case? or give us some advice? thanks very much!
The eye diagram before DS125DF410
The eye diagram After DS125DF410 become poor
  • 0
    TI__Mastermind 43795 points

    Hi Leo,

    Please include a register dump of the ds125df410 registers.  This will help to better understand the issue you are seeing.

    Regards,

    Lee

  • 0 in reply to Lee Sledjeski
    Expert 1595 points
    Hi Lee,
    Thanks for your support. please refer to the register dump of DS125DF410 as below.

    dump channel 0x0 register
    dump SW Retimer All Registers begin!
    Reg 0x0 value is 0x0
    Reg 0x1 value is 0x10
    Reg 0x2 value is 0xdc
    Reg 0x3 value is 0x0
    Reg 0x4 value is 0x0
    Reg 0x5 value is 0x0
    Reg 0x6 value is 0x0
    Reg 0x7 value is 0x0
    Reg 0x8 value is 0x0
    Reg 0x9 value is 0x0
    Reg 0xa value is 0x10
    Reg 0xb value is 0xf
    Reg 0xc value is 0x8
    Reg 0xd value is 0x0
    Reg 0xe value is 0x93
    Reg 0xf value is 0x69
    Reg 0x10 value is 0x3a
    Reg 0x11 value is 0x20
    Reg 0x12 value is 0xa0
    Reg 0x13 value is 0x30
    Reg 0x14 value is 0x0
    Reg 0x15 value is 0x10
    Reg 0x16 value is 0x7a
    Reg 0x17 value is 0x36
    Reg 0x18 value is 0x40
    Reg 0x19 value is 0x23
    Reg 0x1a value is 0x0
    Reg 0x1b value is 0x3
    Reg 0x1c value is 0x24
    Reg 0x1d value is 0x0
    Reg 0x1e value is 0xe9
    Reg 0x1f value is 0x55
    Reg 0x20 value is 0x0
    Reg 0x21 value is 0x0
    Reg 0x22 value is 0x0
    Reg 0x23 value is 0x40
    Reg 0x24 value is 0x0
    Reg 0x25 value is 0x0
    Reg 0x26 value is 0x0
    Reg 0x27 value is 0x27
    Reg 0x28 value is 0x8a
    Reg 0x29 value is 0x40
    Reg 0x2a value is 0x30
    Reg 0x2b value is 0x0
    Reg 0x2c value is 0x72
    Reg 0x2d value is 0x80
    Reg 0x2e value is 0x0
    Reg 0x2f value is 0x6
    Reg 0x30 value is 0x0
    Reg 0x31 value is 0x78
    Reg 0x32 value is 0x11
    Reg 0x33 value is 0x88
    Reg 0x34 value is 0xbf
    Reg 0x35 value is 0x1f
    Reg 0x36 value is 0x31
    Reg 0x37 value is 0x0
    Reg 0x38 value is 0x0
    Reg 0x39 value is 0x0
    Reg 0x3a value is 0xa5
    Reg 0x3b value is 0x0
    Reg 0x3c value is 0x0
    Reg 0x3d value is 0x0
    Reg 0x3e value is 0x80
    Reg 0x3f value is 0x0
    Reg 0x40 value is 0x0
    Reg 0x41 value is 0x1
    Reg 0x42 value is 0x4
    Reg 0x43 value is 0x10
    Reg 0x44 value is 0x40
    Reg 0x45 value is 0x8
    Reg 0x46 value is 0x2
    Reg 0x47 value is 0x80
    Reg 0x48 value is 0x3
    Reg 0x49 value is 0xc
    Reg 0x4a value is 0x30
    Reg 0x4b value is 0x41
    Reg 0x4c value is 0x50
    Reg 0x4d value is 0xc0
    Reg 0x4e value is 0x60
    Reg 0x4f value is 0x90
    Reg 0x50 value is 0x88
    Reg 0x51 value is 0x82
    Reg 0x52 value is 0xa0
    Reg 0x53 value is 0x46
    Reg 0x54 value is 0x52
    Reg 0x55 value is 0x8c
    Reg 0x56 value is 0xb0
    Reg 0x57 value is 0xc8
    Reg 0x58 value is 0x57
    Reg 0x59 value is 0x5d
    Reg 0x5a value is 0x69
    Reg 0x5b value is 0x75
    Reg 0x5c value is 0xd5
    Reg 0x5d value is 0x99
    Reg 0x5e value is 0x96
    Reg 0x5f value is 0xa5
    Reg 0x60 value is 0x0
    Reg 0x61 value is 0x0
    Reg 0x62 value is 0x0
    Reg 0x63 value is 0x0
    Reg 0x64 value is 0x0
    Reg 0x65 value is 0x0
    Reg 0x66 value is 0x0
    Reg 0x67 value is 0x20
    Reg 0x68 value is 0x0
    Reg 0x69 value is 0xa
    Reg 0x6a value is 0x77
    Reg 0x6b value is 0x0
    Reg 0x6c value is 0x0
    Reg 0x6d value is 0x0
    Reg 0x6e value is 0x0
    Reg 0x6f value is 0x0
    Reg 0x70 value is 0x3
    Reg 0x71 value is 0x20
    Reg 0x72 value is 0x0
    Reg 0x73 value is 0x0
    Reg 0x74 value is 0x0
    Reg 0x75 value is 0x0
    dump SW Retimer All Registers end!
    dump channel 0x1 register
    dump SW Retimer All Registers begin!
    Reg 0x0 value is 0x0
    Reg 0x1 value is 0x0
    Reg 0x2 value is 0x9c
    Reg 0x3 value is 0x0
    Reg 0x4 value is 0x0
    Reg 0x5 value is 0x0
    Reg 0x6 value is 0x0
    Reg 0x7 value is 0x0
    Reg 0x8 value is 0x0
    Reg 0x9 value is 0x0
    Reg 0xa value is 0x10
    Reg 0xb value is 0xf
    Reg 0xc value is 0x8
    Reg 0xd value is 0x0
    Reg 0xe value is 0x93
    Reg 0xf value is 0x69
    Reg 0x10 value is 0x3a
    Reg 0x11 value is 0x20
    Reg 0x12 value is 0xa0
    Reg 0x13 value is 0x30
    Reg 0x14 value is 0x0
    Reg 0x15 value is 0x10
    Reg 0x16 value is 0x7a
    Reg 0x17 value is 0x36
    Reg 0x18 value is 0x40
    Reg 0x19 value is 0x23
    Reg 0x1a value is 0x0
    Reg 0x1b value is 0x3
    Reg 0x1c value is 0x24
    Reg 0x1d value is 0x0
    Reg 0x1e value is 0xe9
    Reg 0x1f value is 0x55
    Reg 0x20 value is 0x0
    Reg 0x21 value is 0x0
    Reg 0x22 value is 0x0
    Reg 0x23 value is 0x40
    Reg 0x24 value is 0x0
    Reg 0x25 value is 0x0
    Reg 0x26 value is 0x0
    Reg 0x27 value is 0x27
    Reg 0x28 value is 0x8a
    Reg 0x29 value is 0x40
    Reg 0x2a value is 0x30
    Reg 0x2b value is 0x0
    Reg 0x2c value is 0x72
    Reg 0x2d value is 0x80
    Reg 0x2e value is 0x0
    Reg 0x2f value is 0x6
    Reg 0x30 value is 0x0
    Reg 0x31 value is 0x78
    Reg 0x32 value is 0x11
    Reg 0x33 value is 0x88
    Reg 0x34 value is 0xbf
    Reg 0x35 value is 0x1f
    Reg 0x36 value is 0x31
    Reg 0x37 value is 0x0
    Reg 0x38 value is 0x0
    Reg 0x39 value is 0x0
    Reg 0x3a value is 0xa5
    Reg 0x3b value is 0x0
    Reg 0x3c value is 0x0
    Reg 0x3d value is 0x0
    Reg 0x3e value is 0x80
    Reg 0x3f value is 0x0
    Reg 0x40 value is 0x0
    Reg 0x41 value is 0x1
    Reg 0x42 value is 0x4
    Reg 0x43 value is 0x10
    Reg 0x44 value is 0x40
    Reg 0x45 value is 0x8
    Reg 0x46 value is 0x2
    Reg 0x47 value is 0x80
    Reg 0x48 value is 0x3
    Reg 0x49 value is 0xc
    Reg 0x4a value is 0x30
    Reg 0x4b value is 0x41
    Reg 0x4c value is 0x50
    Reg 0x4d value is 0xc0
    Reg 0x4e value is 0x60
    Reg 0x4f value is 0x90
    Reg 0x50 value is 0x88
    Reg 0x51 value is 0x82
    Reg 0x52 value is 0xa0
    Reg 0x53 value is 0x46
    Reg 0x54 value is 0x52
    Reg 0x55 value is 0x8c
    Reg 0x56 value is 0xb0
    Reg 0x57 value is 0xc8
    Reg 0x58 value is 0x57
    Reg 0x59 value is 0x5d
    Reg 0x5a value is 0x69
    Reg 0x5b value is 0x75
    Reg 0x5c value is 0xd5
    Reg 0x5d value is 0x99
    Reg 0x5e value is 0x96
    Reg 0x5f value is 0xa5
    Reg 0x60 value is 0x0
    Reg 0x61 value is 0x0
    Reg 0x62 value is 0x0
    Reg 0x63 value is 0x0
    Reg 0x64 value is 0x0
    Reg 0x65 value is 0x0
    Reg 0x66 value is 0x0
    Reg 0x67 value is 0x20
    Reg 0x68 value is 0x0
    Reg 0x69 value is 0xa
    Reg 0x6a value is 0x77
    Reg 0x6b value is 0x0
    Reg 0x6c value is 0x0
    Reg 0x6d value is 0x0
    Reg 0x6e value is 0x0
    Reg 0x6f value is 0x0
    Reg 0x70 value is 0x3
    Reg 0x71 value is 0x20
    Reg 0x72 value is 0x0
    Reg 0x73 value is 0x0
    Reg 0x74 value is 0x0
    Reg 0x75 value is 0x0
    dump SW Retimer All Registers end!
    dump channel 0x2 register
    dump SW Retimer All Registers begin!
    Reg 0x0 value is 0x0
    Reg 0x1 value is 0x0
    Reg 0x2 value is 0xdc
    Reg 0x3 value is 0x0
    Reg 0x4 value is 0x0
    Reg 0x5 value is 0x0
    Reg 0x6 value is 0x0
    Reg 0x7 value is 0x0
    Reg 0x8 value is 0x0
    Reg 0x9 value is 0x0
    Reg 0xa value is 0x10
    Reg 0xb value is 0xf
    Reg 0xc value is 0x8
    Reg 0xd value is 0x0
    Reg 0xe value is 0x93
    Reg 0xf value is 0x69
    Reg 0x10 value is 0x3a
    Reg 0x11 value is 0x20
    Reg 0x12 value is 0xa0
    Reg 0x13 value is 0x30
    Reg 0x14 value is 0x0
    Reg 0x15 value is 0x10
    Reg 0x16 value is 0x7a
    Reg 0x17 value is 0x36
    Reg 0x18 value is 0x40
    Reg 0x19 value is 0x23
    Reg 0x1a value is 0x0
    Reg 0x1b value is 0x3
    Reg 0x1c value is 0x24
    Reg 0x1d value is 0x0
    Reg 0x1e value is 0xe9
    Reg 0x1f value is 0x55
    Reg 0x20 value is 0x0
    Reg 0x21 value is 0x0
    Reg 0x22 value is 0x0
    Reg 0x23 value is 0x40
    Reg 0x24 value is 0x3
    Reg 0x25 value is 0x0
    Reg 0x26 value is 0x0
    Reg 0x27 value is 0x27
    Reg 0x28 value is 0x87
    Reg 0x29 value is 0x40
    Reg 0x2a value is 0x30
    Reg 0x2b value is 0x0
    Reg 0x2c value is 0x72
    Reg 0x2d value is 0x80
    Reg 0x2e value is 0x0
    Reg 0x2f value is 0x6
    Reg 0x30 value is 0x0
    Reg 0x31 value is 0x78
    Reg 0x32 value is 0x11
    Reg 0x33 value is 0x88
    Reg 0x34 value is 0xbf
    Reg 0x35 value is 0x1f
    Reg 0x36 value is 0x31
    Reg 0x37 value is 0x0
    Reg 0x38 value is 0x0
    Reg 0x39 value is 0x0
    Reg 0x3a value is 0xa5
    Reg 0x3b value is 0x0
    Reg 0x3c value is 0x0
    Reg 0x3d value is 0x0
    Reg 0x3e value is 0x80
    Reg 0x3f value is 0x0
    Reg 0x40 value is 0x0
    Reg 0x41 value is 0x1
    Reg 0x42 value is 0x4
    Reg 0x43 value is 0x10
    Reg 0x44 value is 0x40
    Reg 0x45 value is 0x8
    Reg 0x46 value is 0x2
    Reg 0x47 value is 0x80
    Reg 0x48 value is 0x3
    Reg 0x49 value is 0xc
    Reg 0x4a value is 0x30
    Reg 0x4b value is 0x41
    Reg 0x4c value is 0x50
    Reg 0x4d value is 0xc0
    Reg 0x4e value is 0x60
    Reg 0x4f value is 0x90
    Reg 0x50 value is 0x88
    Reg 0x51 value is 0x82
    Reg 0x52 value is 0xa0
    Reg 0x53 value is 0x46
    Reg 0x54 value is 0x52
    Reg 0x55 value is 0x8c
    Reg 0x56 value is 0xb0
    Reg 0x57 value is 0xc8
    Reg 0x58 value is 0x57
    Reg 0x59 value is 0x5d
    Reg 0x5a value is 0x69
    Reg 0x5b value is 0x75
    Reg 0x5c value is 0xd5
    Reg 0x5d value is 0x99
    Reg 0x5e value is 0x96
    Reg 0x5f value is 0xa5
    Reg 0x60 value is 0x0
    Reg 0x61 value is 0x0
    Reg 0x62 value is 0x0
    Reg 0x63 value is 0x0
    Reg 0x64 value is 0x0
    Reg 0x65 value is 0x0
    Reg 0x66 value is 0x0
    Reg 0x67 value is 0x20
    Reg 0x68 value is 0x0
    Reg 0x69 value is 0xa
    Reg 0x6a value is 0x77
    Reg 0x6b value is 0x0
    Reg 0x6c value is 0x0
    Reg 0x6d value is 0x0
    Reg 0x6e value is 0x0
    Reg 0x6f value is 0x0
    Reg 0x70 value is 0x3
    Reg 0x71 value is 0x20
    Reg 0x72 value is 0x0
    Reg 0x73 value is 0x0
    Reg 0x74 value is 0x0
    Reg 0x75 value is 0x0
    dump SW Retimer All Registers end!
    dump channel 0x3 register
    dump SW Retimer All Registers begin!
    Reg 0x0 value is 0x0
    Reg 0x1 value is 0x0
    Reg 0x2 value is 0xdc
    Reg 0x3 value is 0x0
    Reg 0x4 value is 0x0
    Reg 0x5 value is 0x0
    Reg 0x6 value is 0x0
    Reg 0x7 value is 0x0
    Reg 0x8 value is 0x0
    Reg 0x9 value is 0x0
    Reg 0xa value is 0x10
    Reg 0xb value is 0xf
    Reg 0xc value is 0x8
    Reg 0xd value is 0x0
    Reg 0xe value is 0x93
    Reg 0xf value is 0x69
    Reg 0x10 value is 0x3a
    Reg 0x11 value is 0x20
    Reg 0x12 value is 0xa0
    Reg 0x13 value is 0x30
    Reg 0x14 value is 0x0
    Reg 0x15 value is 0x10
    Reg 0x16 value is 0x7a
    Reg 0x17 value is 0x36
    Reg 0x18 value is 0x40
    Reg 0x19 value is 0x23
    Reg 0x1a value is 0x0
    Reg 0x1b value is 0x3
    Reg 0x1c value is 0x24
    Reg 0x1d value is 0x0
    Reg 0x1e value is 0xe9
    Reg 0x1f value is 0x55
    Reg 0x20 value is 0x0
    Reg 0x21 value is 0x0
    Reg 0x22 value is 0x0
    Reg 0x23 value is 0x40
    Reg 0x24 value is 0x0
    Reg 0x25 value is 0x0
    Reg 0x26 value is 0x0
    Reg 0x27 value is 0x26
    Reg 0x28 value is 0x87
    Reg 0x29 value is 0x40
    Reg 0x2a value is 0x30
    Reg 0x2b value is 0x0
    Reg 0x2c value is 0x72
    Reg 0x2d value is 0x80
    Reg 0x2e value is 0x0
    Reg 0x2f value is 0x6
    Reg 0x30 value is 0x0
    Reg 0x31 value is 0x78
    Reg 0x32 value is 0x11
    Reg 0x33 value is 0x88
    Reg 0x34 value is 0xbf
    Reg 0x35 value is 0x1f
    Reg 0x36 value is 0x31
    Reg 0x37 value is 0x0
    Reg 0x38 value is 0x0
    Reg 0x39 value is 0x0
    Reg 0x3a value is 0xa5
    Reg 0x3b value is 0x0
    Reg 0x3c value is 0x0
    Reg 0x3d value is 0x0
    Reg 0x3e value is 0x80
    Reg 0x3f value is 0x0
    Reg 0x40 value is 0x0
    Reg 0x41 value is 0x1
    Reg 0x42 value is 0x4
    Reg 0x43 value is 0x10
    Reg 0x44 value is 0x40
    Reg 0x45 value is 0x8
    Reg 0x46 value is 0x2
    Reg 0x47 value is 0x80
    Reg 0x48 value is 0x3
    Reg 0x49 value is 0xc
    Reg 0x4a value is 0x30
    Reg 0x4b value is 0x41
    Reg 0x4c value is 0x50
    Reg 0x4d value is 0xc0
    Reg 0x4e value is 0x60
    Reg 0x4f value is 0x90
    Reg 0x50 value is 0x88
    Reg 0x51 value is 0x82
    Reg 0x52 value is 0xa0
    Reg 0x53 value is 0x46
    Reg 0x54 value is 0x52
    Reg 0x55 value is 0x8c
    Reg 0x56 value is 0xb0
    Reg 0x57 value is 0xc8
    Reg 0x58 value is 0x57
    Reg 0x59 value is 0x5d
    Reg 0x5a value is 0x69
    Reg 0x5b value is 0x75
    Reg 0x5c value is 0xd5
    Reg 0x5d value is 0x99
    Reg 0x5e value is 0x96
    Reg 0x5f value is 0xa5
    Reg 0x60 value is 0x0
    Reg 0x61 value is 0x0
    Reg 0x62 value is 0x0
    Reg 0x63 value is 0x0
    Reg 0x64 value is 0x0
    Reg 0x65 value is 0x0
    Reg 0x66 value is 0x0
    Reg 0x67 value is 0x20
    Reg 0x68 value is 0x0
    Reg 0x69 value is 0xa
    Reg 0x6a value is 0x77
    Reg 0x6b value is 0x0
    Reg 0x6c value is 0x0
    Reg 0x6d value is 0x0
    Reg 0x6e value is 0x0
    Reg 0x6f value is 0x0
    Reg 0x70 value is 0x3
    Reg 0x71 value is 0x20
    Reg 0x72 value is 0x0
    Reg 0x73 value is 0x0
    Reg 0x74 value is 0x0
    Reg 0x75 value is 0x0
    dump SW Retimer All Registers end!
  • 0 in reply to leo xue
    TI__Mastermind 43795 points

    Hi Leo,

    The HEO 0x27 and VEO 0x28 (Horz and Vertical eye opening) of all the channels looks decent and the channels are are "locked" based on the CDR information in register 0x02?  Was the eye in the oscilloscope "closed" when you were reading the registers?

    Regards,

    Lee