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DS160PR410: Question Regarding Connection to operate the chip

AI WS
Prodigy 40 points
Part Number: DS160PR410

Dear TI,

Good day, I would like to ask about the DS160PR410RNQT chip. I have read through the datasheet and have connected according as shown below: 

I tried to connect the signal generator and measure using oscilloscope, I have no luck on getting any signal across. I am running on pin mode since i don't need to use SDA and SCL. The only difference i see is that my VREG is not connected to capacitor before connecting to ground, will that be a problem? Please advise.

Thank you very much! Slight smile

Best Regards

  • 0
    TI__Guru* 93670 points

    Greetings,

    We should have supply coupling Caps on VREG since this is the internal regulator output and we need some supply coupling Cap. However, i don't think this could be the root cause for not seeing the signal coming through the device. Please make sure:

    1). You are AC coupling between signal source and DS160PR410.

    2). Typically we use differential input - RX0+/RX0-. In your diagram you show RX0+ only.

    3). I am not sure what data rate you are using but please make sure you use at least 1Gbps to check signal flow through the device.

    Regards ,, Nasser 

  • 0 in reply to Nasser Mohammadi
    Prodigy 40 points

    Dear Nasser,

    After a lot of testing, I have concluded something. So now, I am testing it this way:

    I am currently testing in 700MHz, since this is the only generator I have so far. I have tested and I still get no signal at all on my oscilloscope. However, I found out that, when I put the Signal Generator in green region and Oscilloscope in red region, I can get a signal. After that, I swap back to default (red being signal generator again) and the linear re-driver is working fine now. I tried on multiple linear re-driver and they all have the same results. Do I have to keep generating signal from the opposite direction before I can use it normally?

    What is happening here, please advice this phenomenon. 

    Thank you very much! Slight smile

    Best Regards

  • +1 in reply to AI WS
    TI__Guru* 93670 points

    Greetings,

    I think this is related to the rx detect function. You are floating RX_DET pin - PCIe rx detection enabled and you scope is high impedance. Please pull RX_DET pin 26 through 59K mode to GND(L3) and then Green could be scope and red could be generator. Or you can enable 50-ohm termination on your scope.

    Regards ,, Nasser

  • 0 in reply to Nasser Mohammadi
    Prodigy 40 points

    Dear Nasser,

    Thank you for this suggestion, I will immediately arrange to modify my PCB and reply when I got the results. At the meantime, I would like to confirm if the linear re-driver is single direction or bi directional? Let's say after I installed the 59K at pin 26. Thanks!

  • 0 in reply to AI WS
    TI__Guru* 93670 points

    Greetings,

    DS160PR410 is an active device and linear redriver is a single direction - from input to output.

    Regards ,, Nasser

  • 0 in reply to Nasser Mohammadi
    Prodigy 40 points

    Hi Nasser,

    I have received my modified board and it works fine now! Thank you very much for the help! Slight smile