Uvm_backdoor and uvm_frontdoor parallel access to a register

UVM
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In reply to debdip microsemi:

First, you are mixing 2 things frontdoor sequence and frontdoor access. These are 2 different things.
second, you have a vild value in your register if the access has been completed. But you want to read via backdoor when the frontdoor access is still not ready. The UVM mechanism is helping you to avoid such an invalid access.