Layered_testbench_memory/transaction.sv at main · Hampton-bit/Layered_testbench_memory · GitHub

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typedef enum
    {
        PRINTABLE_ASCII, UPPER_CASE, LOWER_CASE, PROBABILITY,ANY
    }
    control_t;

class transaction #(parameter DEPTH=32, parameter WIDTH=8);

    // rand bit [ $clog2(DEPTH)-1:0 ] addr;
    // rand bit [ WIDTH-1:0 ]         data;

    control_t ctrl;

    //-----------mem_interface_signals-------------//
    rand logic read;
    rand logic write;

    rand logic [$clog2(DEPTH)-1:0] addr;

    rand logic [WIDTH-1:0] data_in; // data_in TO memory
    logic [WIDTH-1:0] data_out;   // data_in FROM memory
    //--------------------------------------------//


    function void display();
        if(write)  $display("\nWrite Trans | Data_in: %0c | Addr:%0d\n", data_in, addr);
        else $display("Read Trans | Addr:%0d",  addr);
    endfunction

    constraint read_write{
        read&&write !=0;
    }

    constraint read_write_range{
        read inside {1,0};
        write inside {1,0};
    }


    covergroup cover_alpha;
    // option.per_instance = 1;
        a: coverpoint addr;
        d: coverpoint  data_in {
            bins upper={[8'h41:8'h5a]};
            bins lower={[8'h61:8'h7a]};
            bins other= default;
        }
    endgroup : cover_alpha
    // cover_alpha cg;


    // constraint printable_ascii {
    //     data_in inside {
    //         [8'h20 : 8'h7F]
    //     };
    // }

    // constraint ascii_alphabet {
    //     data_in inside {
    //         [8'h41:8'h5a], [8'h61:8'h7a]
    //     };
    // }
    // constraint ascii_weightage {
    //     data_in dist {
    //         [8'h41:8'h5a]:/80, [8'h61:8'h7a]:/20
    //     };
    // }
    // constraint not_ascii_weightage {
    //     (
    //         data_in inside {
    //         [8'h41:8'h5a], [8'h61:8'h7a]
    //         }
    //     );
    // }
    constraint control_knob {
        ctrl== PRINTABLE_ASCII -> data_in inside {
            [8'h20 : 8'h7F]
        };
        ctrl== UPPER_CASE ->   data_in inside {
            [8'h41:8'h5a]
        };
        ctrl== LOWER_CASE ->   data_in inside {
            [8'h61:8'h7a]
        };
        ctrl== PROBABILITY ->   data_in dist {
            [8'h41:8'h5a]:/80, [8'h61:8'h7a]:/20
        };
        ctrl== ANY -> data_in inside{[0: (2**WIDTH)-1] };
    }
    // constraint read_after_write{
    //     write=>read
    // }


    function new(int data_in=0, int data_out=0, int addr=0, control_t ctrl=4);
        this.data_in= data_in;
        this.data_out= data_out;
        this.addr=addr;
        this.ctrl= ctrl;
        cover_alpha=new();
    endfunction


endclass