Weighted constraint

[dave_59]

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System verilog distribution constraint

Consider the below code : class packet; rand bit addr; constraint addr_range { addr dist {1 := 60, 0 :=40 }; } endclass module constr_dist; initial begin packet pkt; pkt = new(); $display("------------------------------------"); repeat(10) begin pkt.randomize(); $display("\taddr = %0d",pkt.addr); end $display("------------------------------------"); end endmodule When i do randomize with dist constraint i see that distribution of 1 and 0 is not exa…