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SN65DP141: Equalization mode and RX Gain

AnBer
Mastermind 28900 points
Part Number: SN65DP141
Other Parts Discussed in Thread: TUSB546-DCI

Team,

I have seen the below post already which gives some useful information:
https://e2e.ti.com/support/interface/digital_interface/f/130/p/533872/1949167#1949167

Do we have some more precise guidelines regarding the settings of the Equalization mode and RX Gain?
-Section 8.4.2 to 8.4.3 lists some possible GPIO mode settings.
-Section 8.4.4 lists possible settings via I2C mode and respective application
http://www.ti.com/product/SN65DP141/datasheet/detailed-description#sllses62960

Q:I assume that the GPIO and I2C settings are a one to one match. correct?
Q:Do we have more precise info on what we mean by Short/Long Input Cable and small/Large Input Swing.
Could you quantify it?

The idea is to have a GPIO mode setting that covers the most probable scenario so that the I2C mode does not need to be used.
In the current scenario there is:
      Connector -> DP141 ->trace (of a couple of cm) -> FPGA
The DP141 should enable to recover the signal coming from a long cable. Still it should work as well in case cable are short.

Thanks in advance,

Anthony

  • 0
    TI__Mastermind 23815 points
    Hi AnBer,

    We don't have precise guidelines regarding the settings, let me elaborate on what each setting does.

    EQ_MODE, Low for cable, High for trace. it slightly changes the EQ curve.
    Comparing cable vs trace modes, cable mode has higher EQ on higher frequencies, while trace mode has higher EQ in lower frequencies.

    Regarding DC gain,
    If the input voltage swing is larger than 600mV, set DC gain to DC to avoid saturation of Rx stage.

    Long channel vs short channel
    This just reflects the EQ range the DP141 is working on

    If you find this device hard to configure, you can move to TUSB546-DCI as DP redriver, it is a linear redriver which include AUX monitoring to save power.

    Regards