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how to drive a clocking block output asynchronously

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Our uvm_driver derivatives push values into the RTL via clocking blocks in interfaces.  This updates the signals synchronously as we typically want, but is there a recommended way to add an asynchronous update of the signal to model a change that could occur when asynchronous reset is applied?  We see that if we just assign to the signal at the interface level (not the clocking block level), we get a conflict between both assignments.  


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