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Adventurer
Adventurer
6,342 Views
Registered: ‎01-28-2008

Aurora RX_SOF_N is constantly asserted

Hi,

 

I am in the process of integrating an Aurora core to a PCIe interface using ML555 board. I have implemented the Virtex 5 Aurora core and when I test in the hardware using chipscope I can see that the RX_SOF_N signal is constantly held low hence the interface receive side not working. Has anyone see this behaviour before?

 

Thanks and regards,

 

Sanka 

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3 Replies
Anonymous
Not applicable
6,306 Views

Re: Aurora RX_SOF_N is constantly asserted

Hi Sanka,

 

Have you verified that Channel_up has gone high and that the link partner is actually sending SOF characters?  A lot of the time it's a simple matter of putting the MGTs into loopback for testing to make sure that everything comes up correctly and is being sent/recieved correctly then moving on to board-to-board verification.  ChipScope is actually very nice for this since you can quickly add the Channel_up, lane_up and all of the local link interface signals for both ends of the link.

 

 

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Visitor noemartl3
Visitor
6,155 Views
Registered: ‎09-03-2008

Re: Aurora RX_SOF_N is constantly asserted

I am experiencing the same issue on my side? However, this is on a custom board that we design and we are using a Virtex4 FX 20 device. Any suggestions would be greatly appreciated. Thanks
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Adventurer
Adventurer
6,150 Views
Registered: ‎01-28-2008

Re: Aurora RX_SOF_N is constantly asserted

I eventually found what I was doing in my case... I was not driving all the input signals into the aurora core properly... in fact I was not driving

 -- UFC Interface

 -- Native Flow Control Interface

 

input signals properly... and once I had these signals driving properly... I had the aurora link working correctly.

 

Thanks a lot for you help.

 

Cheers,

Sanka

 

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