Display port tx multiple istance

[auricm]

Hi all,

I'm designing a system over a XCKU035 FPGA, I set two displayport tx subsystem in two different quad, the first istance is working properly, the second istance seems to ignore the hot plug so no video is displayed on monitor.
Both subsystems are connected to each PHY and to the same microblaze processor, the software initialization is the same for both channels (obviously they are mapped on different address). I check with oscilloscope and I see the hot plug rise and fall as I plug or unplug the monitor, same thing I see usign an ILA inside the block, in the same ILA I connected the irq of the tx subsystem and it never rises as I plug or unplug the monitor. I've enabled the interrupts on both subsystems.

So I can't find where the problem comes as both have the same initialization, I'm missing something?

Regards

[watari]

Hi @auricm 

Would you make sure IRQ signal and behaviour ?

Also, how many microblazes do you implement ?

And, what verstion do you use ?

In my experience, I encounter some IRQ issue with around 2018.1.

So, I guess that the best way is that each microblaze control each DP Tx by causing IRQ issue.

Best regards,

[auricm]

Hi @watari ,

Thanks for the answer, the irq signal coming from the displayport tx subsystem is always low, I use a single microblaze to control both displayport tx, Microblaze version 10.0, Vivado 2018.2.

Regards

[florentw]

Hi @auricm 

Did you try with a design with only the "non-working" instance? Is it working? I would like to make sure everything is working correctly on the HW.

Something you might want to do is to enable the DEBUG information in the log. See if you are getting more information.

I assumed you have already checked the register values for both the VPHY and Displayport IP to see if you can see anything wrong?

[auricm · Accepted solution]

Hi all,

I found that during the the instantiation of the new block I forgot to check the last 19 bit of the address page 73 of PG199. 

Now everithing is working properly, thank you for your support

Best Regards