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DS100MB203: I do not know what register name means.

Jonathan Lee89
Intellectual 380 points
Part Number: DS100MB203

Hi E2E Team.

This is Jonathan from Avnet Korea. 

One of our customer is using DS100MB203 and they are setting up EQ register. 

We have a few questions as below. 

1. The customer want to know what "NC" among the EQ control register name means. 

CH0 NC – S_INA0 EQ

CH1 D_OUT0 – S_INB0 EQ

CH2 NC – S_INA1 EQ

CH3 D_OUT1 – S_INB1 EQ

CH4 D_IN0 – S_OUTA0 EQ

CH6 D_IN1 – S_OUTA1 EQ

CH7 NC – S_OUTB1 EQ

2. There is no EQ control register for CH5 NC – S_OUTB0 on the data sheet. 

3. Could you let me know the details of how to set up EQ & DEM (De-emphasis) with customer's board.

Thanks.  

  • 0
    TI__Mastermind 43795 points

    Hi Jonathan,

    1. NC = Not Connected.

    2.  For some channels there is no input so there is no RxEQ function (CH5 and CH7), other channels have no output function (CH0, CH2

    3.  In most applications I would start out with minimum EQ settings, DEM = 0 dB, and VOD = 1000mV to establish a baseline.

    If you have additional channel loss information it can help me to recommend more optimal settings.

    Regards,

    Lee

  • 0 in reply to Lee Sledjeski
    Intellectual 380 points

    Hi Lee. 

    Thanks for your reply. 

    I have additional question about your reply. 

    1. NC = Not Connected.

    Jonathan Q :  I still have doubts about register naming. In the case of "Not Connected", why do we need to set up RxEQ?

    Could you let me know accurate signal path information about below each channel register name?

    CH0 NC – S_INA0 EQ

    CH1 D_OUT0 – S_INB0 EQ

    CH2 NC – S_INA1 EQ

    CH3 D_OUT1 – S_INB1 EQ

    CH4 D_IN0 – S_OUTA0 EQ

    CH6 D_IN1 – S_OUTA1 EQ

    CH7 NC – S_OUTB1 EQ

    2.  For some channels there is no input so there is no RxEQ function (CH5 and CH7), other channels have no output function (CH0, CH2

    Jonathan Q : I still have doubts about RxEQ function(CH5 and CH7). There is no RxEQ function for CH5, but there is RxEQ function for CH7 as can be seen below data sheet. 

     You mean, there is something wrong in the data sheet?  May be typo?

    3.  In most applications I would start out with minimum EQ settings, DEM = 0 dB, and VOD = 1000mV to establish a baseline.

    If you have additional channel loss information it can help me to recommend more optimal settings.

    Jonathan Q : I'll send you channel loss information if I receive the information from customer. 

    Thanks.

  • 0 in reply to Jonathan Lee89
    TI__Mastermind 43795 points

    Hi Jonathan,

    Sorry the picture did not come out in the post.

    1.  The register names always contain an Input-Output or Output-Input pair.  The left side of the diagram is called out first.

    This makes the first channel CH0:  NC - S_INA0

    Note:  This channel will control S_INA0 RxEQ only.  There is no output associated with CH0 registers.  To control D_OUT0 you will need to use the registers associated with CH1:  D_OUT0 - S_INB0

    2. There is a register for CH7 EQ shown in the datasheet, but this register is not connected to the DS100MB203 datapath.

    3. Waiting on customer for system information. 

    Regards,

    Lee