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random variable of type bit with varying width

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In a register sequence i would like to use data of type uvm_reg_data_t where the value of data should be random.

uvm_reg_data_t data;

size = rg.get_n_bits();

data[size-1:0] = $random;

What should be the type of the variable size? Should it be a parameter or define?

I would like the value of size to change according to the width of the register. So the width of data should change according to the width of the register.

What is the best way to do this?

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