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Original question:

DAC38RF83: Link configuration error reported by DAC

DAC38RF83: Question about Short Test Patterns

XiaoTao Ng
Intellectual 420 points
Part Number: DAC38RF83

Hi,Team:

  I would like to have a test on "Short Test Patterns". The test plan is that send  a Short Test Patterns to DAC and let DAC to check the JESD204B link.

  It is hard to understand why I1/Q1 is blank in Table 33 when JESD MODE=82121. It conflict with the I0/Q0 I1/Q1 mapping in Table 10.

  Can you provide us the detailed  mapping of the samples when DAC is in  "Short Test Patterns"

  Samples description in Table 33 is really to grasp. we hope that a detailed example depiction can be provided.

Best Regards

  • 0
    TI__Guru* 91947 points

    Xiao,

    In Table 10, “i” is used to denote a stream and i0, i1 are two consecutive samples in that stream. Same goes for q. In Table 33, each column is a stream, so i0 i1 q0 q1 refer to four streams, not samples. A little confusing. Those column headings in Table 33 should convey that each column is a stream, not a sample. Since some modes are A1-i, A1-q, A2-i, A2-q, and some are A-i, A-q, B-i, B-q…

     

    The two samples in the Table 33 “i0” column correspond to the i0 and i1 samples shown in Table 10; same goes for q.

    Regards,

    Jim

  • 0 in reply to jim s
    Intellectual 420 points

    Hi,Jim:

      According to your reply, I am clear .  I decide to write the mapping in TX side , as below:

      Lane TX0  : 7C   7C  .......(repeat)........

      Lane TX1  : B8   B8   .......(repeat)........

      Lane TX2  : F4    F4   .......(repeat)........

      Lane TX3  : 31    31   .......(repeat)........

      Lane TX4  : 6D    6D  .......(repeat)........

      Lane TX5  : A9    A9   .......(repeat)........

      Lane TX6 : E5     E5   .......(repeat)........

      Lane TX7  : 20     20   .......(repeat)........

      

      Is it correct ?  Sometimes the datasheet cannot tell the detailed. For example , It is not clear how 7C88 / F431 in table 33 is mapped to I0 / I1 in table 10. 

       Please help check the Short Test Pattern mapping to TX above.

     Thanks

  • 0 in reply to XiaoTao Ng
    TI__Guru* 91947 points

    Xiao,

    What you have shown is correct.

    Regards,

    Jim