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Hi Guys, I am using UVM Register model to mimmick RTL's register implementation. Some registers are not implemented in RTL which are going to be connected to output port of some other module. I have got a HDL path of register as an output port declaration of some module. Something like: The HDL path is: "tb_top.dut_u.interrupt_module_u.o_ext_interrupt" o_ext_interrupt is declared as output port inside interrupt_module, which is not connected to any other wire or register. Can this output port's value be changed by writing to it via UVM BACKDOOR ? I am using following API: register_name.write(status,data,UVM_BACKDOOR,default_map); I dont see any change in value in the register. I think it is happening because the destination (o_ext_interrupt) is output of the module. I am using Cadence's simulator: irun. Please help if anyone is aware of such issue. Regards, Vismay.