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Visitor josemao0
Visitor
58 Views
Registered: ‎07-02-2018

FMC Connector for LVDS implementation + Kintex 7

Hello, 

I plan to design an expanssion board to be able to use LVDS DDR signals from FMC_HPC (J22) connector in Kintex 7 KC705 Evaliation FPGA. I see in the documentation I have the posibility to use HA and LA signals.

My doubt is:

- If I use LA or HA signals, do I have to drive those FMC_HPC_HA_CC/FMC_HPC_LA_CC (with external SMA connectors for example) from FMC for LVDS, or I can use another internal signal to generate LDVS outputs?. 

- Is it better to use LA or HA, or I can use both of then without any problem?. Is there any specific recomendation for it?

I appreciate all the support and time spend in my query,

 

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2 Replies
Scholar watari
Scholar
48 Views
Registered: ‎06-16-2013

Re: FMC Connector for LVDS implementation + Kintex 7

Hi @josemao0

 

Would you share your target frequency ?

Because of it depends on your application.

 

Best regards,

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Xilinx Employee
Xilinx Employee
45 Views
Registered: ‎06-02-2017

回复: FMC Connector for LVDS implementation + Kintex 7

Hi @josemao0,

Please the answer below:

- If I use LA or HA signals, do I have to drive those FMC_HPC_HA_CC/FMC_HPC_LA_CC (with external SMA connectors for example) from FMC for LVDS, or I can use another internal signal to generate LDVS outputs?. 

Every FPGA IO differential pairs can generate LVDS output, so you can use any FMC differential pair signals.

- Is it better to use LA or HA, or I can use both of then without any problem?. Is there any specific recomendation for it?

I think there is no difference between LA and HA signals for LVDS, but you need to check the board you used. Not every signals on the FMC connector are connected to the FPGA pins. So make sure the signals you used are connected to the FPGA IO.

 

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