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Visitor
Visitor
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Registered: ‎04-04-2014

Kintex 7 AXI clock

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I have a 100 MHz clock for PCIe use. Can i use this for the AXI-interface? I can only choose 62,5 or 125 MHz when generating the IP. Do i have to change the 100 MHz clock to a 125 MHz?

 

Regards, Thomas

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Scholar
Scholar
14,976 Views
Registered: ‎02-03-2010

Re: Kintex 7 AXI clock

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Hi ,

 

The referance clock is different from AXI clock.

 

The PCIe IP that gets generated is wrapper of the PCIe hard block and the MGT(GTX for K7).

 

The referance clock is taken from the PCIe connector that comes from link and provided to MGT.

The txoutclk from the MGT is provided to MMCM which will generate the core clocks and user clock.

The mmcm will be in the file <corename>_clock.v/vhd

 

The choice of the axi clock frequency maintains the data rate at link side with userside.

So you need to use the axi clock that core provides to interface user application.

 

Regards,

Koti Reddy

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Scholar
Scholar
14,977 Views
Registered: ‎02-03-2010

Re: Kintex 7 AXI clock

Jump to solution

Hi ,

 

The referance clock is different from AXI clock.

 

The PCIe IP that gets generated is wrapper of the PCIe hard block and the MGT(GTX for K7).

 

The referance clock is taken from the PCIe connector that comes from link and provided to MGT.

The txoutclk from the MGT is provided to MMCM which will generate the core clocks and user clock.

The mmcm will be in the file <corename>_clock.v/vhd

 

The choice of the axi clock frequency maintains the data rate at link side with userside.

So you need to use the axi clock that core provides to interface user application.

 

Regards,

Koti Reddy

--------------------------------------------------​--------------------------------------------
Kindly note- Please mark the Answer as "Accept as solution" if information provided is helpful.

Give Kudos to a post which you think is helpful.
--------------------------------------------------​-------------------------------------------

View solution in original post

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