Intel® Quartus® Prime Software
Intel® Quartus® Prime Design Software, Design Entry, Synthesis, Simulation, Verification, Timing Analysis, System Design (Platform Designer, formerly Qsys)
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Platform Designer - clock bridge : Interfaces must be on the same clock domain

ALMSlinger
Novice
702 Views

Hi,

To split up the a large clock tree, I inserted a clock bridge in my platform designer file. 

 

Now, I have one PLL generated clock CLK --> clk bridge --> cout_0, cout_1, cout_2.

The clock bridge frequency is set to "0" so "derived" from what I can see.

Previously, I had CLK going to IP blocks - A,B,C.

Now I have :

cout_0 --> A, 

cout_1 --> B,

cout_2 --> C

There are custom data busses that connect between A--> B --> C.

 

Doing this throws a connectivity error.  It says that A.databus and B.databus should be on the same clock domain.  

 

The "clock domains" tab in platform designer gui  shows that all the modules are in the "CLK" clock domain. i.e. the input clock to the clock bridge.

 

How can I fix this this error?

 

Thank you.

Best regards,

 

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SyafieqS
Employee
654 Views

Seem like to me the clock bridge you inserted is not properly synchronizing the clocks for the data buses A, B, and C, which is causing the connectivity error. To fix this, you need to ensure that the data buses are properly synchronized to the same clock domain.


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sstrell
Honored Contributor III
598 Views

What are A, B, and C using for reset?  Perhaps the resets are synchronous to a different clock domain.

Screenshots would help.

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ALMSlinger
Novice
588 Views

They use common reset that is synchronous to the clock generated by the pll.  The same clock that is input to the clock bridge.  I even tried to add a parallel reset bridge which did the same thing as the clocks.  But that doesn't help.  I get the same error.

 

Thank you.

Best regards.

 

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sstrell
Honored Contributor III
585 Views

Can you show screenshots of parameters and how you're connecting things?

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SyafieqS
Employee
531 Views

Any update from previous reply?


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SyafieqS
Employee
476 Views

As we do not receive any response from you on the previous question/reply/answer that we have provided. Please login to https://supporttickets.intel.com/, view details of the desire request, and post a feed/response within the next 15 days to allow me to continue to support you. After 15 days, this thread will be transitioned to community support. The community users will be able to help you on your follow-up questions.


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