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Explorer
Explorer
375 Views
Registered: ‎04-19-2018

NVMe polarity reversal?

 

Sorry if not the proper forum, a simple question, can I route NVMe devices with reversed polarity? (so RX+ to TX- and RX- to TX+). I understand this can be done in PCIe to easy routing and afaik NVMe uses the same (?) PHY...

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5 Replies
Teacher drjohnsmith
Teacher
359 Views
Registered: ‎07-09-2009

Re: NVMe polarity reversal?

I think yes,
Without knowing you FPGA , Im not in a position to check, but I remember that you can invert the P and N in the GTx PHYs you use in the FPGA,
<== If this was helpful, please feel free to give Kudos, and close if it answers your question ==>
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Xilinx Employee
Xilinx Employee
299 Views
Registered: ‎08-02-2007

Re: NVMe polarity reversal?

Yes  PCIE IP supports polarity reversal and you can connect to link partiner with reversaled polarity

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Explorer
Explorer
294 Views
Registered: ‎04-19-2018

Re: NVMe polarity reversal?

@liy 

I know that, but I'd like to know if that applies to NVMe as well

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Explorer
Explorer
292 Views
Registered: ‎04-19-2018

Re: NVMe polarity reversal?

@drjohnsmith 

it shouldn't matter I think, but I plan to use the GTH transceivers on the PL of a Zynq us+

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Xilinx Employee
Xilinx Employee
291 Views
Registered: ‎08-02-2007

Re: NVMe polarity reversal?

polarity reversal is a must by spec

so if the link partiner is compliant to Spec it will be fine

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