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juliensakam
Posts: 3
Registered: ‎05-29-2012
0

Debugging port dbg_ur_no_bar_hit for PCIe

Hello,

 

I am using the Xapp1052 design, along with the RootPort Model. I modified the sources, I managed to create a constant flow of Memory Write TLPs from the Tx Interface. During the simultation, after a couple TLPs sent, the signal dbg_ur_no_bar_hit pulses High, wich means:


"This signal pulses High for one USERCLK cycle to

indicate that a received read or write request did not
match any configured BAR."

 

dbg_hit_bar.JPG

 

In the User Guide, it is said that this problem is common. I have made sure I enabled the bus master mode. The address chosen was 0x0 for all TLP transactions.

 

My Questions:

-> What is the cause of this problem? Is this due to a wrong Address?

-> If the address is the issue, why does this event occur ONE time during the simultation?

 

Does anyone have an idea? Feel free to ask me questions or suggestions. 

 

Best regards.