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TMDS181: About the functional mode of TMDS181/TMDS171. Does the Retimer mode include Redriver functionality?

强 王
Prodigy 125 points
Part Number: TMDS181
Other Parts Discussed in Thread: TMDS171

Ladies and gentlemen, I have some questions about the functional mode of TMDS181/TMDS171:

1. Does Retimer mode include Redriver function?

2. Why is the mode set to crossover (driver-retimer) mode?

3. Are there any disadvantages if the full range is set to Retimer mode?

Thank you very much!

  • 0
    TI__Guru*** 146555 points
    default is retimer/redriver mode. you need I2C to set either in redriver or retime mode. there is no any disadvantages if the full range is set to Retimer mode
  • 0 in reply to Brian Zhou
    Prodigy 125 points
    Thank you very much for your answer.
    There are two more questions to ask. Thank you very much.
    Q1:My understanding of Retimer mode and Redriver mode is as follows. Is it correct?
    TMDS181 mainly has EQ module, CDR module (PLL), Driver module.
    Retimer mode contains all the functions.
    Redriver mode skips CDR module, only EQ and Driver module, and the performance of EQ and Driver is exactly the same as that of Retimer mode.
    CDR functions only make sense at high speeds (jitter and skew will have a greater impact on transmission at high speeds), so the chip will recommend setting in Crossover mode.
    According to the function description of register 0Ah 1:0 in the data manual, I can forcibly switch to Retimer or Redriver mode through I2C. But this is not recommended.

    Q2:According to the description of Redriver Mode in the data manual, in Redriver mode, the device only compensates for the loss of ISI. Is ISI compensation also available in Retimer mode? Which module is used to implement this function?