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Defining new access type for fields

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Has anyone defined their own access for fields? I see there is define_access in uvm_reg_field, but I don't see how to define the functionality of the access. For example, suppose I want a new access type similar to RW, only writes are blocked for certain configurations specified in a configuration register.

The predict function in uvm_reg_field defaults to assuming normal write access, so it looks like I would need to extend uvm_reg_field and redefine functions XpredictX and predict. It seems like there should be a better and/or easier way.

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