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DS80PCI402: Passing a PERST signal for PCI

Carolus Andrews
Mastermind 23235 points
Part Number: DS80PCI402
Other Parts Discussed in Thread: SN65LVDS100, LMK00334

Team,

I have a customer designing with DS80PCI402, and they are designing an HBA board to redrive PCIe signals over an OCulink cable. The main question here is: should they buffer the PERST signal, and if so, can you recommend a good way to do this? Is passing this signal through the 402 recommended?

Also, they are using SN65LVDS100DGK to buffer the 100MHz RefClk. Is this a good solution or can you recommend something better?

 

 

  • 0
    TI__Mastermind 43795 points

    Hi Carolus,

    The PERST signal is a 3.3V signal and it is very low speed.  You should not need to buffer it.

    The REFCLK is not designed around LVDS levels.  I would not recommend the SN65LVDS100 to buffer the signal.

    The LMK00334 is an excellent buffer, but it has 4 outputs.  I did not locate any 1:1 buffers compatible with HCSL signal levels.

    Regards,

    Lee