UPGRADE YOUR BROWSER

We have detected your current browser version is not the latest one. Xilinx.com uses the latest web technologies to bring you the best online experience possible. Please upgrade to a Xilinx.com supported browser:Chrome, Firefox, Internet Explorer 11, Safari. Thank you!

cancel
Showing results for 
Search instead for 
Did you mean: 
Observer mmohiuddin
Observer
183 Views
Registered: ‎09-18-2017

JESD204B Lane Number Mismatch

Jump to solution

Hi all,

I'm using the Xilinx JES204B IP (evaluation license) on a Kintex-7 for the TX side of the link, and an AD9173 for the RX side.  I'm having trouble establishing a link in Subclass 0.  Using the IP wizard, I've configured the core to use 2 lanes per link (L=2).  The AXI register 0x028 should show the number of lanes in use minus 1 (L-1), and should have a value of 1 for my configuration.  However, when I readback this register I always get a value of 3, indicating that I have 4 lanes being used.

I've reset the output products, cleared the IP cache, and even deleted and rebuilt the core from scratch many times.  However none of this worked, and register 0x028 always has a readback value of 3.  What is going on here?

Mashrur

0 Kudos
1 Solution

Accepted Solutions
Highlighted
Xilinx Employee
Xilinx Employee
128 Views
Registered: ‎10-19-2011

Re: JESD204B Lane Number Mismatch

Jump to solution

Hi @mmohiuddin ,

I think you just misread the user guide a little bit. In pg066, table 2-25, is written: "Each bit corresponds to a single lane, when set to “1” lane is active."

So it is not a count of the lanes used, but a direct mapping. And you can select/deselect specific lanes of the originally configured ones if you want.

------------------------------------------------------------------------------
Don't forget to reply, give kudo and accept as solution
------------------------------------------------------------------------------
1 Reply
Highlighted
Xilinx Employee
Xilinx Employee
129 Views
Registered: ‎10-19-2011

Re: JESD204B Lane Number Mismatch

Jump to solution

Hi @mmohiuddin ,

I think you just misread the user guide a little bit. In pg066, table 2-25, is written: "Each bit corresponds to a single lane, when set to “1” lane is active."

So it is not a count of the lanes used, but a direct mapping. And you can select/deselect specific lanes of the originally configured ones if you want.

------------------------------------------------------------------------------
Don't forget to reply, give kudo and accept as solution
------------------------------------------------------------------------------