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Observer david_li1984
Observer
9,049 Views
Registered: ‎12-28-2013

aurora 8b10b : possible to use rxrecclk to generate txusrclk & rxusrclk ?

Hi,

I'm connecting a v5 board with a v6 board by aurora 8b10b cores. Two different reference clock are used for the two boards.   To get consistent valid rx data, I try to generate txusrclk & rxusrclk from rxrecclk on v5 which receives data.      

In hardware debug, the signal channel_up of v5 keeps high most time,  but will drop at intervals due to hard error.

Further examination shows txbuferr is asserted.

 

Why? Is it right to use rxrecclk like this?

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3 Replies
Moderator
Moderator
9,046 Views
Registered: ‎02-16-2010

Re: aurora 8b10b : possible to use rxrecclk to generate txusrclk & rxusrclk ?

NO. Aurora 8B10B uses TXOUTCLK to generate both TXUSRCLK and RXUSRCLK.

Also, it can work for PPM difference of upto +/- 100ppm between channel partners if you are using standard_cc module provided with example design.
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Xilinx Employee
Xilinx Employee
9,040 Views
Registered: ‎01-03-2008

Re: aurora 8b10b : possible to use rxrecclk to generate txusrclk & rxusrclk ?

> Further examination shows txbuferr is asserted.

> Why? Is it right to use rxrecclk like this?

 

The transmitter TXUSRCLK must be derived from the REFCLK clock source for correct operation.  The RXRECCLK can only be used with the receiver path.

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Observer david_li1984
Observer
9,029 Views
Registered: ‎12-28-2013

Re: aurora 8b10b : possible to use rxrecclk to generate txusrclk & rxusrclk ?

Thank you

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