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Altera_Forum
Honored Contributor I
788 Views

Stratix V GX SI Dev Kit - Sometimes no link in Transceiver Toolkit

Hello, 

i am using the mentioned board and successfully tested an external transceiver loop with the examples (10312 mbps). I also changed the phy in qsys to fractions of 10312 mbps whichs works as long as the reference clock remains constant. 

 

Now I changed to 6000 mbps with 300 MHz and i get no link, also 12500 mbps with 500 MHz refclk. 

 

In another case I configured the low latency PHY with 8000mbps and 500 MHz and it works without problems.  

 

I changed the refclk to 500 MHz in Qsys/clocks, Qsys/phy and in the sdc-file and of cause i changed the clock on the board. 

 

 

Does anyone has an idea why some datarates doesn't work, respectivly what I forgot? 

 

Thanks, Micha
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4 Replies
Altera_Forum
Honored Contributor I
57 Views

It sound weird, the higher rate works fine while lower rate seems problematic. You mentoned it does not work in external loopbavk, how about internal loopback? 

Question: thd first attempt is work on custom phy or native phy? 

can try the non-working rate on low latency phy as seem low latency phy is alqays working?
Altera_Forum
Honored Contributor I
57 Views

 

--- Quote Start ---  

It sound weird, the higher rate works fine while lower rate seems problematic. You mentoned it does not work in external loopbavk, how about internal loopback? 

--- Quote End ---  

 

 

i will take a look. 

 

 

--- Quote Start ---  

 

Question: thd first attempt is work on custom phy or native phy? 

can try the non-working rate on low latency phy as seem low latency phy is alqays working? 

--- Quote End ---  

 

 

All rates are made on low latency phy. So, I can't follow you exactly, can you give me some more explainations :)?
Altera_Forum
Honored Contributor I
57 Views

Ok, if all on low latency phy, then it is fine. I though u try on different phy. I am trying to isolate the common failure symptom from your experiments

Altera_Forum
Honored Contributor I
57 Views

Maybe u can try the 6gbps using Native Phy, to isolate whether is phy dependent.

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