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DS90UB925Q and SN65LVDS109

Philipp Eck
Prodigy 40 points
Other Parts Discussed in Thread: SN65LVDS109, SN65LVDS104, DS25CP104A

Hi,

I've two short questions. 

1. The DS90UB925q is backward compatible with FPD-Link II.

So my question is, is it backward compatible on to ..UR916Q? It is a little bit confusing, because in the datasheet of the UB925Q it isn't mentioned, while in the datasheet of the ..UH925Q it is mentioned.

2. I want to split my LVDS signals (FPD-Link III and/or FPD Link II) in 4 identical signals by using the SN65LVDS109.

Do i have to mind something when i switch the LVDS input of the LVDS109 from FPD-Link II to III?

Best regards

Philipp

  • 0
    Prodigy 40 points

    1. Question has been settled.

    2.  This question has changed, because i am suspecting that it is possible to split one signal in four identical signals by using the SN65LVDS104.

    So how can i split one lvds fpd-link  II (fpd-link III) signal in four identical signals? Maybe with a crosspoint switch?

    Is it generally possible to split a fdp-link III signal? 

  • 0 in reply to Philipp Eck
    TI__Expert 7395 points
    Hi Philipp,

    In general, FPD-Link III chipsets only support point-to-point applications. Inserting an external mux or switch device between the link will interrupt the bidirectional signaling of the FPD-Link III interface; since it is full-duplex communication. However, if you are operating in backward compatibility mode (FPD-Link II mode without the bidirectional control channel), then it would feasible to connect to another mux/switch/splitter device.  The SN65LVDS104 looks to be a possible solution for your application. Be sure to check if the mux/switch DC thresholds and VCM levels meet the Serdes I/O parameters. In cases where the I/O biasing network differs, then AC coupling is required.  Please also take a look at this literature for more info:

    http://www.ti.com/lit/an/snla111/snla111.pdf

    Dac Tran

    SVA / APPS

  • 0 in reply to Dac Tran
    Prodigy 40 points

    Thanks for your reply Dac,

    In your link i found the crosspoint switch ds25cp104a, which seems to be the best solution for my problem. So for the input i use a fpd link II signal and after the switch, the signal will go to the deserializers.  I hope that will work.

    Philipp