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Following is the sequence code class basic_sequence extends from uvm_sequence(#sequence_item); sequence_item item; task body() fp1 =fscanf("abc.txt", addr, data); `uvm_do_with(item,{ item.addr = addr; item.data = data; }); endtask endclass I have constrained addr and data from file reading data. It is not happening with the above code. data_item is getting a random value. I have written a user-defined task to solve this problem like below task do_rw(int addr, int data); begin item = sequence_item::type_id::create("item",,get_full_name()); item.wr_adr.rand_mode(0); item.wr_dat.rand_mode(0); item.wr_adr = addr; item.wr_dat = data; start_item(item); randomize(if_item); finish_item(item); end endtask inplace of uvm_do_with call uder defined do_rw task like below fp1 = fscanf("abc.txt", addr, data); while(!eof(fp1) { do_rw(addr, data); } This will work. I used above solution to work. I really don't understand why uvm is not supporting it with uvm_do_with. any answers for fit?? Thanks, Satya
