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Observer gustavsvj
Observer
173 Views
Registered: ‎02-25-2019

Connecting KCU105 with VC709 using FMC

Hello,

I'm currently designing what will end up being a FMC mechanize card. For now this design is implemented on the KCU105 while the VC709 is acting as the motherboard.
So far I've been able to use the LPC-FMC on the KCU105 but for the final evaluation I'll need to use the HPC-FMC. To connect the two boards the following cable is used: http://suddendocs.samtec.com/prints/hdr-169470-xx.pdf

And this is where the problem is. Because of the orientation of the connector the cable has to pass over at least one of the boards. With the LPC-FMC this is possible but with the HPC-FMC the cable collides with the cooling fan mounted on the FPGA. I've been looking for FMC cables where the connectors are oriented in a way so the cable doesn't pass over the board but so far I haven't been able to find anything. 

Any help will be much appreciated,
GustavIMG_20190418_093040.jpg

 

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6 Replies
Moderator
Moderator
138 Views
Registered: ‎09-15-2016

Re: Connecting KCU105 with VC709 using FMC

Hi @gustavsvj 

Will rotating both LPC-FMC, HPC-FMC connectors towards VC709 won't work for you? Our connectors are designed such that whenever FMC is installed, it faces away from the board.

Here is the link to FMC cable supported with Kintex Ultrascale and Virtex 7:

https://www.xilinx.com/products/boards-and-kits/1-988bi5.html

Regards
Rohit
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119 Views
Registered: ‎01-22-2015

Re: Connecting KCU105 with VC709 using FMC

Swap positions of the two boards and flip VC709 upside down?

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Observer gustavsvj
Observer
81 Views
Registered: ‎02-25-2019

Re: Connecting KCU105 with VC709 using FMC

Dear Rohit,

If the product picture of the cable you linked to is accurate then it wont work. The orientation of the cable is the same on both ends on the cable meaning that one of them will have to pass over the board. I've tried to illustrate the problem in the picture below.

Kind regards,
Gustav

FMC.png

 

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Observer gustavsvj
Observer
79 Views
Registered: ‎02-25-2019

Re: Connecting KCU105 with VC709 using FMC

Dear Mark,
Unfortunately that doesn't solve the problem. If you take a look at my answer to Rohit it should make sense why not.
Kind regards,
Gustav
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66 Views
Registered: ‎01-22-2015

Re: Connecting KCU105 with VC709 using FMC

@gustavsvj 

Connect the FMC cable to both boards (as shown in your photo) and then rotate things (as shown in sketch below).  This gives two new orientations that prevent the cable from covering the fan on KCU105.
FMC_brd_to_brd.jpg

Cheers,
Mark

 

Observer gustavsvj
Observer
62 Views
Registered: ‎02-25-2019

Re: Connecting KCU105 with VC709 using FMC

Dear Mark,

Thank you for your suggestion! We've already tried this and unfortunately the cable we have isn't bendable enough. 
If you have succeeded with the sketched approach a part number for the used cable would be immensely helpful.  

Kind regards,
Gustav

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