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Design >> High-Speed I/O Design >> How to connect PCB and FPGA board?
https://designers-guide.org/forum/YaBB.pl?num=1460780669

Message started by mixed_signal on Apr 15^th, 2016, 9:24pm

Title: How to connect PCB and FPGA board?
Post by mixed_signal on Apr 15^th, 2016, 9:24pm

Hi,
I have a custom RFIC in QFN package with bond wires. The IC is soldered on a PCB. There are 20 digital I/Os in custom board and they need to be controlled using Kintex FPGA board.The data speed is 40Mbps in each I/O. How to connect the PCB and FPGA board (see attached figure)?

The FPGA board has FMC connector. I am planning to use board to board flexible connector between my PCB and FPGA board. Is there better solution?

Title: Re: How to connect PCB and FPGA board?
Post by ULPAnalog on Apr 15^th, 2016, 10:50pm

Is the separation half a meter?

Title: Re: How to connect PCB and FPGA board?
Post by mixed_signal on May 4^th, 2016, 8:45pm

Hi ULPAnalog,
Yes the seperation is half meter. I am worried about logic levels. The buffers onchip are 1V CMOS single ended inveretrs. Do I need level shifters after FMC?

Title: Re: How to connect PCB and FPGA board?
Post by loose-electron on Jul 6^th, 2016, 10:37pm

that is a lot of parallel digital IO

if you need all that distance, you might want to convert to LVDS output driver from one board, transfer over a twisted pair and then convert back thru LVDS receiver to the local PCB ground.