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Visitor
Visitor
1,426 Views
Registered: ‎01-05-2018

Issue in xapp1271 passthrough mode

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Hello,

 

I have a design similar to xapp1271.We are facing the issue in passthrough mode.TX only mode works fine.In pass through mode training is success,but we cannot get the image at the output display.While debugging by ILA ,even with a 'full black image' as input,the videophy output is not showing any zero pattern,it shows some random values.Is that correct?I cannot get any zero pixel stream at the output of display port rx also.Is there any issue for disport rx or videophy.

 

Thanks in advance

 

 

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Xilinx Employee
Xilinx Employee
1,306 Views
Registered: ‎03-30-2016

Hello @aminak

Both hardware & driver codes are updated since 2016.4
Please check the attachement for DP RX & TX susbsystem update since 2016.4. (You can get this information from Vivado IP catalog ) ( DisplayPort IP core is not accessible since 2017.2)

We do not have Pass-through example design for DispayPort subsystems, by the time we released Vivado 2016.4.
This is the reason XAPP1271 is released.

Thanks & regards
Leo

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Xilinx Employee
Xilinx Employee
1,360 Views
Registered: ‎03-30-2016

Hello @aminak

 

XAPP1271 is very old (using 2016.4 DisplayPort IP). We have a few IP bug fixs since then.

Could you please try DisplayPort RX Subsystem Example design from 2018.2 ?

https://www.xilinx.com/support/documentation/ip_documentation/dp_rx_subsystem/v2_1/pg233-displayport-rx-subsystem.pdf

 

Thanks & regards

Leo

XC_DP_PASSTHROUGH.png
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Visitor
Visitor
1,319 Views
Registered: ‎01-05-2018

Hello,

what is the difference between the xapp1271 and new  version design?It is in hardware design or microblaze software code?

 

Thanks in advance

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Xilinx Employee
Xilinx Employee
1,307 Views
Registered: ‎03-30-2016

Hello @aminak

Both hardware & driver codes are updated since 2016.4
Please check the attachement for DP RX & TX susbsystem update since 2016.4. (You can get this information from Vivado IP catalog ) ( DisplayPort IP core is not accessible since 2017.2)

We do not have Pass-through example design for DispayPort subsystems, by the time we released Vivado 2016.4.
This is the reason XAPP1271 is released.

Thanks & regards
Leo

View solution in original post

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Teacher
Teacher
1,301 Views
Registered: ‎06-16-2013

Hi @aminak

 

As @karnanl already mentioned before, there are many different between latest version and xapp1271.

Especially, the stability and compatibility of DP are improved by latest version.

 

So I suggest to use and/or refer latest example design in Vivado.

 

Best regards,

 

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Visitor
Visitor
1,267 Views
Registered: ‎01-05-2018

Solved the issue with vivado 2018.2 example design.Thank you for support.