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shobbs1044
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Registered: ‎03-24-2021

External Cable Solutions

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I am designing a custom board (device not yet fixed, but probably either a larger Artix-7 or smaller Kintex-7).  I need to have a PCIe interface via cable (looking at the Molex IPASS family - copper cable).  I am not sure what my signal length will be, but at most, it would be 3 to 4 meters.  What guidelines can I use to determine if I need a redriver IC - or can the Artix/Kintex MGT drive directly?

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drjohnsmith
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Registered: ‎07-09-2009

gen 2, don't sweat re driver / re timer. 

https://www.digikey.co.uk/product-detail/en/diodes-incorporated/PI3EQX12902BZLEX/PI3EQX12902BZLEXCT-ND/6202105

 

 

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drjohnsmith
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Registered: ‎07-09-2009

Id always redrive,

   reason,

    probability of damage on the line is high, ESD et all,

     with re driver, the driver blows, no redirver, the FPGA blows.

get a re driver with resistor set parameters, such as diodes inc, and then you can tinker with the settings if you need to .

 

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shobbs1044
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Registered: ‎03-24-2021

Thank you for the prompt response. I am somewhat new to the idea of redriving.  I am currently digging through the differences between redrivers and retimers.

Given the FPGAs I mentioned above, I will be limited to PCIe gen2.  Will the use of a redriver (or a retimer?) impact my compatibility with the standard?  Ideally, I will be able to use a commercial solution at the other end (i.e., a card with an appropriate connector plugged into a normal PC backplane).

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drjohnsmith
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Registered: ‎07-09-2009

gen 2, don't sweat re driver / re timer. 

https://www.digikey.co.uk/product-detail/en/diodes-incorporated/PI3EQX12902BZLEX/PI3EQX12902BZLEXCT-ND/6202105

 

 

<== If this was helpful, please feel free to give Kudos, and close if it answers your question ==>

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