GTX - Aurora

Question

Hi

I am trying to implement Aurora 8b10b using Z030.
The Aurora configuration is:

GT Rate: 250Mhz
Line Rate: 1Gbps
Init_clk and drp_clk: 100Mhz
Width: 2Bytes

I use X0Y1 transceivers for testing using differents Vivado projects. I used the example design for Aurora and the result: ERROR COUNT is full using external loopback.

For checking Aurora signals, I activate Vivado Lab Tools. Running ILA with an internal loop I do not get errors in the transmission and lots of glitches in the soft_err_i signal.

So.. I used IBERT for tuning my channel and I got the value for TXDIFFSWING, TXPOSTCURSOR, TXPRECURSOR for a good eye diagram with LPM mode.

As Aurora IP Core has DFE mode by default, I need to change it. I modified the <..transceiver_wrapper.vhdl> setting to RXLPMEN=1 and the rest of the tuning values that I got from IBERT.

I also applied this:

Change the auto adaptation mode to freeze or override mode using the following:

RXDFEAGC/LF/UTHOLD
RXDFEAGC/LF/UTOVRDEN

The problem after the synthesis, I check the Schematic and none of this values in the GTXE_CHANNEL change (I Reset and lunch Synthesis for updating)
I use: set_property IS_MANAGED false [get_files aurora_8b10b_0.xci] for being able to edit the IPCore.

After the implementation in board, nothing change.. still the error counter is overflowed

Please someone can help me with his issue.

drozwood90 · Accepted Answer

Hi there,

I'm not sure what you mean. Are you saying the configuration values did not change? Or are you saying that you are expecting the schematic to follow the output / input values from the Aurora 8b10b protocol?

If you changed the underlying files by hand, it is VERY possible that you did not change the correct ones. Vivado tends to make a copy of the working set. While you actually DID change the source file, it is not the file that Vivado is actually working with. Take a look at the file itself in the file list (top most box to the RIGHT of the project navigator). From there, you should be able to locate the ACTUAL working file in the project. Then, it is only a matter of using a tool like WInMerge to copy your changes into the working file and refresh the project. I typically will close and re-open the project. This tends to give me the best success when hand editing a file that Vivado is managing.

Please let us know how this works out!

--Dan