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DP83TD510E: Questions about a DSP ANEG script

Kazuhiko Hirano
Genius 16128 points

Part Number: DP83TD510E

Tool/software:

Hello,

I received a couple of questions from my customer regarding DSP ANEG script in Extend Network Reach with IEEE 802.3cg 10BASE-T1L Ethernet PHYs (Rev. A) as follows.

========================================================================
The DSP ANEG script is described in page 7 of the Extend Network reach with IEEE 802.3cg 10BASE-T1L Ethernet PHYs (Sluaaa9a.PDF). I would like to know how this script work?

--------
Begin
001F 8000 // hard reset
08A6 04A8 // belden enable & IDX force enable
08A1 0D14 // FAGC disabled
08A4 0180 // FAGC init
08A5 0824 // DEQ offset = 2
08F0 0088 // IDX Lim = 8, scaling factor for 7
08A2 7A66 // ADC BO aneg
08A3 0552 // ADC BO aneg
001F 4000 // soft reset
End
--------

Q1: If possible, I would like to hear explanations of the line by line, but if it is difficult, I would appreciate it if TI could give a qualitative explanation. (I imagined that the output power of AutoNegtiation should always be at the highest level, and the reception sensitivity should always be at the highest level.)

Q2: Are there any side effects from these settings? For example, long reach can be achieved but short reach is not possible, power consumption increases, signal quality decreases, and so on. In short, if there are no side effects, it might be good to recommend it to all users, but I am worried that there is a reason why it is not mentioned in the datasheet. (Of course, it would be appreciated if there were no side effects.)
==================================================================

Best regards,

K.Hirano

  • +1
    TI__Expert 7825 points

    Hi Hirano, 

    Unfortunately, I cannot provide line by line details to customer since that is proprietary TI information, but on a high level, these settings essentially remove/modify certain settings for the Digital Signal Processing block controlling gain control/filters/etc on the MDI path which makes it easier for the signal to be interpreted.

    These changes only affect the reception of the Auto-negotiation LSM pulses since they are tuned to only affect frequencies around the 625kHz range, and would not have any significant drawbacks on normal communication. 

    These register configuration wasn't mentioned in the datasheet since these changes only help with cable reach if the Auto-negotiation pulses aren't able to be interpreted properly due to the insertion loss limitation. Since this is a niche application, it is not required to set these registers if the customer is not facing this behavior.

    Best,

    Vivaan