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DS320PR810: Parameter configuration for DS320PR810

Harry Ma
Intellectual 2570 points
Part Number: DS320PR810

Tool/software:

Hi Team

Customer is using 32pcs DS320PR810 on a single board as the driver of PCIE 5.0.  At present, the online IIC communication method is used for parameter debugging. 

based on the datasheet, customer only adjust the two sets of register parameters of 0X01 and 0X03, and a lot of parameter combinations are carried out on 0X01 and 0X03 during the debugging process, but it is difficult to get the correct parameters.

At present, only 2 lane is debugged for the appropriate eye diagram. And the parameters between adjacent Lane are very different (0X01 and 0X03).

Can you please help to see if the debugging method is correct. Please help to provide the parameter debugging method of the correct courier. Thanks!

 

  • 0
    TI__Mastermind 18705 points

    Hi Harry,

    The recommended method of EQ configuration/testing is to follow the different EQ Index settings as shown in Table 7-1. Each EQ Index is a combination of settings for channel register 0x01 and channel register 0x03, and they are organized so that the the strength and filter behavior of the overall EQ boost increases from EQ Index 0 --> EQ Index 1 --> EQ Index 2 --> etc. in a controlled plan. It is not recommended to individually modify the settings of channel registers 0x01 and 0x03 without following the combinations in the EQ Index system because the results can be unusual. For more information on the EQ index system, you can refer to section 3 of our application note on redriver equalization: https://www.ti.com/lit/an/snla461/snla461.pdf

    For general redriver EQ tuning, the most basic method to tune a channel is to start at EQ Index 0 (smallest amount of equalization that the redriver can provide), check the signal quality, then try the higher EQ indexes step by step to see if there is improvement until it is clear what EQ index has the best performance. If there are major differences in trace length from one channel to another in one redriver, or if there are major differences in trace length between different redrivers, it's possible that different EQ indexes can lead to the best performance on different channels and different redrivers.

    Best,

    Evan Su