04-02-2020 01:12 AM
we have today successfully implemented an aurora link with the configuration shown below.
We use a special DAC (Direct Attach Cable QSFP28 <-> 4 SFP, passive copper cable.) allowing to connect the u200 to a zcu111 board. It works fine.
I need now to connect this system to another board which has an onboard lase TX/RX module. I therefrore need to use a optical fiber, and a sfp optical module which I plugged into a mechanical adapter(QSFP28 to QSFP) (https://www.amazon.in/Mellanox-Technologies-MAM1Q00A-QSA-CABLE-ADAPTER/dp/B00FFVFVS0).
placed in the Alveo QSFP28 port.
Here are the questions:
Any help is welcome.
Thanks in advance!
04-02-2020 09:44 AM
There have been many posts on the forums asking about qsfp usage. You might want to search around here.
Here's a Xilinx answer record. https://www.xilinx.com/support/answers/71981.html it describes how to use the board aware flow with the Alveo cards. The board aware flow will connect the GTs to the proper quads for use with the QSFP ports. Aurora is not listed as a supported configuration though.
Do not use an XDC, I do not believe the published ones are correct for the u200 and u250.
I think LPMODE should be low, you might need to connect external power. However I'm hoping that the board aware flow can get your GT link up.
04-03-2020 03:28 AM
As you know form earlier discussions, we are working directly with IPI.... but I am very disappointed that Xilinx does not make the efforts to correct the xdc files....especially when, we, customers, do noyt have access to the hardware descriptions (schematics and so on).
04-03-2020 03:39 PM
We are still working on correcting them. They are currently wrong though.
The status is "in progress" but there is no timeline associated.
Not sure if it helps, but we did recently do a full revamp of the U280 and U50 XDCs, though they are not applicable to the u200 and u250.
I'm sending your feedback up my management chain.