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[/] [t6507lp/] [trunk/] [rtl/] [verilog/] [t6507lp_alu_tb.v] - Blame information for rev 145

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`include "timescale.v"
module t6507lp_alu_tb;
 
`include  "t6507lp_package.v"
 
reg         clk;
reg         reset_n;
reg         alu_enable;
wire [7:0]  alu_result;
wire [7:0]  alu_status;
reg  [7:0]  alu_opcode;
reg  [7:0]  alu_a;
wire [7:0]  alu_x;
wire [7:0]  alu_y;
reg  [31:0] i;
 
reg [7:0] alu_result_expected;
reg [7:0] alu_status_expected;
reg [7:0] alu_x_expected;
reg [7:0] alu_y_expected;
 
reg c_aux;
reg [7:0] temp;
 
t6507lp_alu DUT (
                        .clk            (clk),
                        .reset_n        (reset_n),
                        .alu_enable     (alu_enable),
                        .alu_result     (alu_result),
                        .alu_status     (alu_status),
                        .alu_opcode     (alu_opcode),
                        .alu_a          (alu_a),
                        .alu_x          (alu_x),
                        .alu_y          (alu_y)
                );
 
 
localparam period = 10;
 
task check;
        begin
                $display("               RESULTS       EXPECTED");
                $display("alu_result       %h             %h   ", alu_result, alu_result_expected);
                $display("alu_status    %b       %b   ", alu_status, alu_status_expected);
                $display("alu_x            %h             %h   ", alu_x,      alu_x_expected     );
                $display("alu_y            %h             %h   ", alu_y,      alu_y_expected     );
                if ((alu_result_expected != alu_result) || (alu_status_expected != alu_status) || (alu_x_expected != alu_x) || (alu_y_expected != alu_y))
                begin
                        $display("ERROR at instruction %h",alu_opcode);
                        $finish;
                end
                else
                begin
                        $display("Instruction %h... OK!", alu_opcode);
                end
        end
endtask
 
 
always begin
        #(period/2) clk = ~clk;
end
 
initial
begin
        // Reset
        clk = 0;
        reset_n = 0;
        @(negedge clk);
        @(negedge clk);
        //reset_n = 1;
        alu_enable = 1;
        alu_result_expected = 8'h00;
        alu_status_expected = 8'b00100010;
        alu_x_expected = 8'h00;
        alu_y_expected = 8'h00;
 
        // LDA
        alu_a = 0;
        alu_opcode = LDA_IMM;
        //$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);
        //$display("op1 = %d op2 = %d  c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);
        @(negedge clk);
        alu_result_expected = 8'h00;
        //                       NV1BDIZC
        alu_status_expected = 8'b00100010;
        check();
 
        // ADC
        alu_opcode = ADC_IMM;
        alu_a = 1;
        for (i = 0; i < 1000; i = i + 1)
        begin
                @(negedge clk);
                //$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);
                //$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);
                //$display("op1 = %d op2 = %d  c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);
                {alu_status_expected[C], alu_result_expected} = alu_a + alu_result_expected + alu_status_expected[C];
                alu_status_expected[Z] = (alu_result_expected == 0) ? 1 : 0;
                alu_status_expected[N] = alu_result_expected[7];
                alu_status_expected[V] = ((alu_a[7] == DUT.A[7]) && (alu_a[7] != alu_result_expected[7]));
                check();
        end
 
        // ADC
        alu_opcode = ASL_ABS;
        for (i = 0; i < 1000; i = i + 1)
        begin
                alu_a = i;
                @(negedge clk);
                //$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);
                //$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);
                //$display("op1 = %d op2 = %d  c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);
                {alu_status_expected[C], alu_result_expected} = {alu_a,1'b0};
                alu_status_expected[Z] = (alu_result_expected == 0) ? 1 : 0;
                alu_status_expected[N] = alu_result_expected[7];
                check();
        end
 
        // LDA
        alu_a = 0;
        alu_opcode = LDA_IMM;
    //$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);
        //$display("op1 = %d op2 = %d  c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);
        @(negedge clk);
        alu_result_expected = 8'h00;
        //                       NV1BDIZC
        alu_status_expected[Z] = (alu_result_expected == 0) ? 1 : 0;
        alu_status_expected[N] = alu_result_expected[7];
        check();
 
        // SBC
        alu_opcode = SBC_IMM;
        for (i = 0; i < 1000; i = i + 1)
        begin
                alu_a = 1;
                @(negedge clk);
                //$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);
                //$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);
                //$display("op1 = %d op2 = %d  c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);
                {alu_status_expected[C], alu_result_expected} = alu_result_expected - alu_a - ~alu_status_expected[C];
                alu_status_expected[Z] = (alu_result_expected == 0) ? 1 : 0;
                alu_status_expected[N] = alu_result_expected[7];
                alu_status_expected[V] = ((alu_a[7] == DUT.A[7]) && (alu_a[7] != alu_result_expected[7]));
                check();
        end
 
        // LDA
        alu_opcode = LDA_IMM;
        for (i = 0; i < 1000; i = i + 1)
        begin
                alu_a = i;
                @(negedge clk);
                alu_result_expected = i;
                alu_status_expected[Z] = (alu_result_expected == 0) ? 1 : 0;
                alu_status_expected[N] = alu_result_expected[7];
                //$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);
                //$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);
                //$display("op1 = %d op2 = %d  c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);
                check();
        end
 
        // LDX
        alu_opcode = LDX_IMM;
        for (i = 0; i < 1000; i = i + 1)
        begin
                alu_a = i;
                @(negedge clk);
                alu_x_expected = i;
                //alu_result_expected = i;
                alu_status_expected[Z] = (alu_x_expected == 0) ? 1 : 0;
                alu_status_expected[N] = alu_x_expected[7];
                //$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);
                //$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);
                //$display("op1 = %d op2 = %d  c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);
                check();
        end
 
        // LDY
        alu_opcode = LDY_IMM;
        for (i = 0; i < 1001; i = i + 1)
        begin
                alu_a = i;
                @(negedge clk);
                alu_y_expected = i;
                //alu_result_expected = i;
                alu_status_expected[Z] = (alu_y_expected == 0) ? 1 : 0;
                alu_status_expected[N] = alu_y_expected[7];
                //$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);
                //$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);
                //$display("op1 = %d op2 = %d  c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);
                check();
        end
 
        // STA
        alu_opcode = STA_ABS;
        for (i = 0; i < 1000; i = i + 1)
        begin
                alu_a = i;
                @(negedge clk);
                //$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);
                //$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);
                //$display("op1 = %d op2 = %d  c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);
                check();
        end
 
        // STX
        alu_opcode = STX_ABS;
        for (i = 0; i < 1000; i = i + 1)
        begin
                alu_a = i;
                @(negedge clk);
                //alu_result_expected = i;
                //alu_x_expected = i;
                //$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);
                //$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);
                //$display("op1 = %d op2 = %d  c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);
                check();
        end
 
        // STY
        alu_opcode = STY_ABS;
        for (i = 0; i < 1000; i = i + 1)
        begin
                alu_a = i;
                @(negedge clk);
                //alu_result_expected = i;
                //alu_y_expected = i;
                //$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);
                //$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);
                //$display("op1 = %d op2 = %d  c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);
                check();
        end
 
        // CMP
        alu_opcode = CMP_IMM;
        for (i = 0; i < 1000; i = i + 1)
        begin
                alu_a = i;
                @(negedge clk);
                temp = alu_result_expected - alu_a;
                alu_status_expected[Z] = (temp == 0) ? 1 : 0;
                alu_status_expected[N] = temp[7];
                alu_status_expected[C] = (alu_result_expected >= alu_a) ? 1 : 0;
                //alu_result_expected = i;
                //alu_y_expected = i;
                //$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);
                //$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);
                //$display("op1 = %d op2 = %d  c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);
                check();
        end
 
        // CPX
        alu_opcode = CPX_IMM;
        for (i = 0; i < 1000; i = i + 1)
        begin
                alu_a = i;
                @(negedge clk);
                temp = alu_x_expected - alu_a;
                alu_status_expected[Z] = (temp == 0) ? 1 : 0;
                alu_status_expected[N] = temp[7];
                alu_status_expected[C] = (alu_x_expected >= alu_a) ? 1 : 0;
                //alu_result_expected = i;
                //alu_y_expected = i;
                //$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);
                //$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);
                //$display("op1 = %d op2 = %d  c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);
                check();
        end
 
        // CPY
        alu_opcode = CPY_IMM;
        for (i = 0; i < 1000; i = i + 1)
        begin
                alu_a = i;
                @(negedge clk);
                temp = alu_y_expected - alu_a;
                alu_status_expected[Z] = (temp == 0) ? 1 : 0;
                alu_status_expected[N] = temp[7];
                alu_status_expected[C] = (alu_y_expected >= alu_a) ? 1 : 0;
                //alu_result_expected = i;
                //alu_y_expected = i;
                //$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);
                //$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);
                //$display("op1 = %d op2 = %d  c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);
                check();
        end
 
 
        // AND
        alu_opcode = AND_IMM;
        for (i = 0; i < 1000; i = i + 1)
        begin
                alu_a = i;
                @(negedge clk);
                alu_result_expected = i & alu_result_expected;
                alu_status_expected[Z] = (alu_result_expected == 0) ? 1 : 0;
                alu_status_expected[N] = alu_result_expected[7];
                //$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);
                //$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);
                //$display("op1 = %d op2 = %d  c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);
                check();
        end
 
        // ASL
        alu_opcode = ASL_ACC;
        for (i = 0; i < 1000; i = i + 1)
        begin
                alu_a = i;
                @(negedge clk);
                alu_status_expected[C] = alu_result_expected[7];
                alu_result_expected[7:0] = alu_result_expected << 1;
                alu_status_expected[Z] = (alu_result_expected == 0) ? 1 : 0;
                alu_status_expected[N] = alu_result_expected[7];
                //$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);
                //$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);
                //$display("op1 = %d op2 = %d  c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);
                check();
        end
 
        // INC
        alu_opcode = INC_ZPG;
        for (i = 0; i < 1000; i = i + 1)
        begin
                alu_a = i;
                @(negedge clk);
                //$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);
                //$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);
                //$display("op1 = %d op2 = %d  c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);
                alu_result_expected = alu_a + 1;
                alu_status_expected[Z] = (alu_result_expected == 0) ? 1 : 0;
                alu_status_expected[N] = alu_result_expected[7];
                check();
        end
 
        // INX
        alu_opcode = INX_IMP;
        for (i = 0; i < 1000; i = i + 1)
        begin
                alu_a = i;
                @(negedge clk);
                //$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);
                //$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);
                //$display("op1 = %d op2 = %d  c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);
                alu_x_expected = alu_x_expected + 1;
                alu_status_expected[Z] = (alu_x_expected == 0) ? 1 : 0;
                alu_status_expected[N] = alu_x_expected[7];
                check();
        end
 
        // INY
        alu_opcode = INY_IMP;
        for (i = 0; i < 1000; i = i + 1)
        begin
                alu_a = i;
                @(negedge clk);
                //$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);
                //$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);
                //$display("op1 = %d op2 = %d  c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);
                alu_y_expected = alu_y_expected + 1;
                alu_status_expected[Z] = (alu_y_expected == 0) ? 1 : 0;
                alu_status_expected[N] = alu_y_expected[7];
                check();
        end
 
        // DEC
        alu_opcode = DEC_ZPG;
        for (i = 0; i < 1000; i = i + 1)
        begin
                alu_a = i;
                @(negedge clk);
                //$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);
                //$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);
                //$display("op1 = %d op2 = %d  c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);
                alu_result_expected = alu_a - 1;
                alu_status_expected[Z] = (alu_result_expected == 0) ? 1 : 0;
                alu_status_expected[N] = alu_result_expected[7];
                check();
        end
 
        // DEX
        alu_opcode = DEX_IMP;
        for (i = 0; i < 1000; i = i + 1)
        begin
                alu_a = i;
                @(negedge clk);
                //$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);
                //$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);
                //$display("op1 = %d op2 = %d  c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);
                alu_x_expected = alu_x_expected - 1;
                alu_status_expected[Z] = (alu_x_expected == 0) ? 1 : 0;
                alu_status_expected[N] = alu_x_expected[7];
                check();
        end
 
        // DEY
        alu_opcode = DEY_IMP;
        for (i = 0; i < 1000; i = i + 1)
        begin
                alu_a = i;
                @(negedge clk);
                //$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);
                //$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);
                //$display("op1 = %d op2 = %d  c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);
                alu_y_expected = alu_y_expected - 1;
                alu_status_expected[Z] = (alu_y_expected == 0) ? 1 : 0;
                alu_status_expected[N] = alu_y_expected[7];
                check();
        end
 
 
        // LDA
        alu_a = 0;
        alu_opcode = LDA_IMM;
        //$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);
        //$display("op1 = %d op2 = %d  c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);
        @(negedge clk);
        alu_result_expected = 8'h00;
        //                       NV1BDIZC
        alu_status_expected = 8'b00100010;
        check();
 
        // BIT
        alu_opcode = BIT_ZPG;
        for (i = 0; i < 1000; i = i + 1)
        begin
                alu_a = i;
                @(negedge clk);
                $display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);
                $display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);
                $display("op1 = %d op2 = %d  c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);
                alu_status_expected[Z] = ((alu_a & alu_result_expected) == 0) ? 1 : 0;
                alu_status_expected[V] = alu_a[6];
                alu_status_expected[N] = alu_a[7];
                check();
        end
 
        // SEC
        alu_opcode = SEC_IMP;
        @(negedge clk);
        alu_status_expected[C] = 1;
        check();
 
        // SED
        alu_opcode = SED_IMP;
        @(negedge clk);
        alu_status_expected[D] = 1;
        check();
 
        // SEI
        alu_opcode = SEI_IMP;
        @(negedge clk);
        alu_status_expected[I] = 1;
        check();
 
        // CLC
        alu_opcode = CLC_IMP;
        @(negedge clk);
        alu_status_expected[C] = 0;
        check();
 
        // CLD
        alu_opcode = CLD_IMP;
        @(negedge clk);
        alu_status_expected[D] = 0;
        check();
 
        // CLI
        alu_opcode = CLI_IMP;
        @(negedge clk);
        alu_status_expected[I] = 0;
        check();
 
        // CLV
        alu_opcode = CLV_IMP;
        @(negedge clk);
        alu_status_expected[V] = 0;
        check();
 
        // LDA
        alu_opcode = LDA_IMM;
        alu_a = 8'h76;
        @(negedge clk);
        alu_result_expected = alu_a;
        alu_status_expected[Z] = (alu_result_expected == 0) ? 1 : 0;
        alu_status_expected[N] = alu_result_expected[7];
        check();
 
        // TAX
        alu_opcode = TAX_IMP;
        @(negedge clk);
        alu_x_expected = alu_result_expected;
        alu_status_expected[Z] = (alu_x_expected == 0) ? 1 : 0;
        alu_status_expected[N] = alu_x_expected[7];
        check();
 
        // TAY
        alu_opcode = TAY_IMP;
        @(negedge clk);
        alu_y_expected = alu_result_expected;
        alu_status_expected[Z] = (alu_y_expected == 0) ? 1 : 0;
        alu_status_expected[N] = alu_y_expected[7];
        check();
 
        // TSX
        alu_opcode = TSX_IMP;
        @(negedge clk);
        alu_x_expected = alu_a;
        //alu_result_expected = alu_a;
        alu_status_expected[Z] = (alu_x_expected == 0) ? 1 : 0;
        alu_status_expected[N] = alu_x_expected[7];
        check();
 
        // TXA
        alu_opcode = TXA_IMP;
        @(negedge clk);
        alu_result_expected = alu_x_expected;
        alu_status_expected[Z] = (alu_result_expected == 0) ? 1 : 0;
        alu_status_expected[N] = alu_result_expected[7];
        check();
 
        // TXS
        alu_opcode = TXS_IMP;
        @(negedge clk);
        alu_result_expected = alu_x_expected;
        check();
 
        // TYA
        alu_opcode = TYA_IMP;
        @(negedge clk);
        alu_result_expected = alu_y_expected;
        alu_status_expected[Z] = (alu_result_expected == 0) ? 1 : 0;
        alu_status_expected[N] = alu_result_expected[7];
        check();
 
        // Nothing should happen
        // BCC
        alu_opcode = BCC_REL;
        @(negedge clk);
        check();
 
        // BCS
        alu_opcode = BCS_REL;
        @(negedge clk);
        check();
 
        // BEQ
        alu_opcode = BEQ_REL;
        @(negedge clk);
        check();
 
        // BMI
        alu_opcode = BMI_REL;
        @(negedge clk);
        check();
 
        // BNE
        alu_opcode = BNE_REL;
        @(negedge clk);
        check();
 
        // BPL
        alu_opcode = BPL_REL;
        @(negedge clk);
        check();
 
        // BVC
        alu_opcode = BVC_REL;
        @(negedge clk);
        check();
 
        // BVS
        alu_opcode = BVS_REL;
        @(negedge clk);
        check();
 
        // JMP
        alu_opcode = JMP_ABS;
        @(negedge clk);
        check();
 
        // JMP
        alu_opcode = JMP_IND;
        @(negedge clk);
        check();
 
        // JSR
        alu_opcode = JSR_ABS;
        @(negedge clk);
        check();
 
        // NOP
        alu_opcode = NOP_IMP;
        @(negedge clk);
        check();
 
        // RTS
        alu_opcode = RTS_IMP;
        @(negedge clk);
        check();
 
        $display("TEST PASSED");
        $finish;
end
 
endmodule
 

Line No.	Rev	Author	Line
1	127	gabrielosh	`include "timescale.v"
2	136	gabrielosh	`module t6507lp_alu_tb;`
3	127	gabrielosh
4	136	gabrielosh	`include "t6507lp_package.v"
5	127	gabrielosh
6	136	gabrielosh	`reg clk;`
7	140	gabrielosh	`reg reset_n;`
8	136	gabrielosh	`reg alu_enable;`
9			`wire [7:0] alu_result;`
10			`wire [7:0] alu_status;`
11			`reg [7:0] alu_opcode;`
12			`reg [7:0] alu_a;`
13			`wire [7:0] alu_x;`
14			`wire [7:0] alu_y;`
15			`reg [31:0] i;`
16	127	gabrielosh
17			`reg [7:0] alu_result_expected;`
18			`reg [7:0] alu_status_expected;`
19			`reg [7:0] alu_x_expected;`
20			`reg [7:0] alu_y_expected;`
21
22			`reg c_aux;`
23			`reg [7:0] temp;`
24
25	136	gabrielosh	`t6507lp_alu DUT (`
26			`.clk (clk),`
27			`.reset_n (reset_n),`
28	127	gabrielosh	`.alu_enable (alu_enable),`
29			`.alu_result (alu_result),`
30			`.alu_status (alu_status),`
31			`.alu_opcode (alu_opcode),`
32			`.alu_a (alu_a),`
33			`.alu_x (alu_x),`
34			`.alu_y (alu_y)`
35			`);`
36
37
38			`localparam period = 10;`
39
40			`task check;`
41			`begin`
42			`$display(" RESULTS EXPECTED");`
43			`$display("alu_result %h %h ", alu_result, alu_result_expected);`
44			`$display("alu_status %b %b ", alu_status, alu_status_expected);`
45			`$display("alu_x %h %h ", alu_x, alu_x_expected );`
46			`$display("alu_y %h %h ", alu_y, alu_y_expected );`
47			`if ((alu_result_expected != alu_result) \|\| (alu_status_expected != alu_status) \|\| (alu_x_expected != alu_x) \|\| (alu_y_expected != alu_y))`
48			`begin`
49			`$display("ERROR at instruction %h",alu_opcode);`
50			`$finish;`
51			`end`
52			`else`
53			`begin`
54			`$display("Instruction %h... OK!", alu_opcode);`
55			`end`
56			`end`
57			`endtask`
58
59
60			`always begin`
61	136	gabrielosh	`#(period/2) clk = ~clk;`
62	127	gabrielosh	`end`
63
64			`initial`
65			`begin`
66			`// Reset`
67	136	gabrielosh	`clk = 0;`
68			`reset_n = 0;`
69	140	gabrielosh	`@(negedge clk);`
70			`@(negedge clk);`
71	143	creep	`//reset_n = 1;`
72	127	gabrielosh	`alu_enable = 1;`
73			`alu_result_expected = 8'h00;`
74			`alu_status_expected = 8'b00100010;`
75			`alu_x_expected = 8'h00;`
76			`alu_y_expected = 8'h00;`
77
78			`// LDA`
79			`alu_a = 0;`
80			`alu_opcode = LDA_IMM;`
81			`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
82			`//$display("op1 = %d op2 = %d c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);`
83	140	gabrielosh	`@(negedge clk);`
84	127	gabrielosh	`alu_result_expected = 8'h00;`
85			`// NV1BDIZC`
86			`alu_status_expected = 8'b00100010;`
87			`check();`
88
89			`// ADC`
90			`alu_opcode = ADC_IMM;`
91			`alu_a = 1;`
92			`for (i = 0; i < 1000; i = i + 1)`
93			`begin`
94	140	gabrielosh	`@(negedge clk);`
95	127	gabrielosh	`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
96			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
97			`//$display("op1 = %d op2 = %d c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);`
98			`{alu_status_expected[C], alu_result_expected} = alu_a + alu_result_expected + alu_status_expected[C];`
99			`alu_status_expected[Z] = (alu_result_expected == 0) ? 1 : 0;`
100			`alu_status_expected[N] = alu_result_expected[7];`
101			`alu_status_expected[V] = ((alu_a[7] == DUT.A[7]) && (alu_a[7] != alu_result_expected[7]));`
102			`check();`
103			`end`
104
105	145	gabrielosh	`// ADC`
106			`alu_opcode = ASL_ABS;`
107			`for (i = 0; i < 1000; i = i + 1)`
108			`begin`
109			`alu_a = i;`
110			`@(negedge clk);`
111			`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
112			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
113			`//$display("op1 = %d op2 = %d c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);`
114			`{alu_status_expected[C], alu_result_expected} = {alu_a,1'b0};`
115			`alu_status_expected[Z] = (alu_result_expected == 0) ? 1 : 0;`
116			`alu_status_expected[N] = alu_result_expected[7];`
117			`check();`
118			`end`
119
120			`// LDA`
121			`alu_a = 0;`
122			`alu_opcode = LDA_IMM;`
123			`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
124			`//$display("op1 = %d op2 = %d c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);`
125			`@(negedge clk);`
126			`alu_result_expected = 8'h00;`
127			`// NV1BDIZC`
128			`alu_status_expected[Z] = (alu_result_expected == 0) ? 1 : 0;`
129			`alu_status_expected[N] = alu_result_expected[7];`
130			`check();`
131
132	127	gabrielosh	`// SBC`
133			`alu_opcode = SBC_IMM;`
134			`for (i = 0; i < 1000; i = i + 1)`
135			`begin`
136	145	gabrielosh	`alu_a = 1;`
137	140	gabrielosh	`@(negedge clk);`
138	127	gabrielosh	`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
139			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
140			`//$display("op1 = %d op2 = %d c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);`
141			`{alu_status_expected[C], alu_result_expected} = alu_result_expected - alu_a - ~alu_status_expected[C];`
142			`alu_status_expected[Z] = (alu_result_expected == 0) ? 1 : 0;`
143			`alu_status_expected[N] = alu_result_expected[7];`
144			`alu_status_expected[V] = ((alu_a[7] == DUT.A[7]) && (alu_a[7] != alu_result_expected[7]));`
145			`check();`
146			`end`
147
148			`// LDA`
149			`alu_opcode = LDA_IMM;`
150			`for (i = 0; i < 1000; i = i + 1)`
151			`begin`
152			`alu_a = i;`
153	140	gabrielosh	`@(negedge clk);`
154	127	gabrielosh	`alu_result_expected = i;`
155			`alu_status_expected[Z] = (alu_result_expected == 0) ? 1 : 0;`
156			`alu_status_expected[N] = alu_result_expected[7];`
157			`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
158			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
159			`//$display("op1 = %d op2 = %d c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);`
160			`check();`
161			`end`
162
163			`// LDX`
164			`alu_opcode = LDX_IMM;`
165			`for (i = 0; i < 1000; i = i + 1)`
166			`begin`
167			`alu_a = i;`
168	140	gabrielosh	`@(negedge clk);`
169	127	gabrielosh	`alu_x_expected = i;`
170			`//alu_result_expected = i;`
171			`alu_status_expected[Z] = (alu_x_expected == 0) ? 1 : 0;`
172			`alu_status_expected[N] = alu_x_expected[7];`
173			`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
174			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
175			`//$display("op1 = %d op2 = %d c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);`
176			`check();`
177			`end`
178
179			`// LDY`
180			`alu_opcode = LDY_IMM;`
181			`for (i = 0; i < 1001; i = i + 1)`
182			`begin`
183			`alu_a = i;`
184	140	gabrielosh	`@(negedge clk);`
185	127	gabrielosh	`alu_y_expected = i;`
186			`//alu_result_expected = i;`
187			`alu_status_expected[Z] = (alu_y_expected == 0) ? 1 : 0;`
188			`alu_status_expected[N] = alu_y_expected[7];`
189			`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
190			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
191			`//$display("op1 = %d op2 = %d c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);`
192			`check();`
193			`end`
194
195			`// STA`
196			`alu_opcode = STA_ABS;`
197			`for (i = 0; i < 1000; i = i + 1)`
198			`begin`
199			`alu_a = i;`
200	140	gabrielosh	`@(negedge clk);`
201	127	gabrielosh	`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
202			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
203			`//$display("op1 = %d op2 = %d c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);`
204			`check();`
205			`end`
206
207			`// STX`
208			`alu_opcode = STX_ABS;`
209			`for (i = 0; i < 1000; i = i + 1)`
210			`begin`
211			`alu_a = i;`
212	140	gabrielosh	`@(negedge clk);`
213	127	gabrielosh	`//alu_result_expected = i;`
214			`//alu_x_expected = i;`
215			`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
216			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
217			`//$display("op1 = %d op2 = %d c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);`
218			`check();`
219			`end`
220
221			`// STY`
222			`alu_opcode = STY_ABS;`
223			`for (i = 0; i < 1000; i = i + 1)`
224			`begin`
225			`alu_a = i;`
226	140	gabrielosh	`@(negedge clk);`
227	127	gabrielosh	`//alu_result_expected = i;`
228			`//alu_y_expected = i;`
229			`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
230			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
231			`//$display("op1 = %d op2 = %d c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);`
232			`check();`
233			`end`
234
235			`// CMP`
236			`alu_opcode = CMP_IMM;`
237			`for (i = 0; i < 1000; i = i + 1)`
238			`begin`
239			`alu_a = i;`
240	140	gabrielosh	`@(negedge clk);`
241	127	gabrielosh	`temp = alu_result_expected - alu_a;`
242			`alu_status_expected[Z] = (temp == 0) ? 1 : 0;`
243			`alu_status_expected[N] = temp[7];`
244			`alu_status_expected[C] = (alu_result_expected >= alu_a) ? 1 : 0;`
245			`//alu_result_expected = i;`
246			`//alu_y_expected = i;`
247			`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
248			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
249			`//$display("op1 = %d op2 = %d c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);`
250			`check();`
251			`end`
252
253			`// CPX`
254			`alu_opcode = CPX_IMM;`
255			`for (i = 0; i < 1000; i = i + 1)`
256			`begin`
257			`alu_a = i;`
258	140	gabrielosh	`@(negedge clk);`
259	127	gabrielosh	`temp = alu_x_expected - alu_a;`
260			`alu_status_expected[Z] = (temp == 0) ? 1 : 0;`
261			`alu_status_expected[N] = temp[7];`
262			`alu_status_expected[C] = (alu_x_expected >= alu_a) ? 1 : 0;`
263			`//alu_result_expected = i;`
264			`//alu_y_expected = i;`
265			`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
266			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
267			`//$display("op1 = %d op2 = %d c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);`
268			`check();`
269			`end`
270
271			`// CPY`
272			`alu_opcode = CPY_IMM;`
273			`for (i = 0; i < 1000; i = i + 1)`
274			`begin`
275			`alu_a = i;`
276	140	gabrielosh	`@(negedge clk);`
277	127	gabrielosh	`temp = alu_y_expected - alu_a;`
278			`alu_status_expected[Z] = (temp == 0) ? 1 : 0;`
279			`alu_status_expected[N] = temp[7];`
280			`alu_status_expected[C] = (alu_y_expected >= alu_a) ? 1 : 0;`
281			`//alu_result_expected = i;`
282			`//alu_y_expected = i;`
283			`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
284			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
285			`//$display("op1 = %d op2 = %d c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);`
286			`check();`
287			`end`
288
289
290			`// AND`
291			`alu_opcode = AND_IMM;`
292			`for (i = 0; i < 1000; i = i + 1)`
293			`begin`
294			`alu_a = i;`
295	140	gabrielosh	`@(negedge clk);`
296	127	gabrielosh	`alu_result_expected = i & alu_result_expected;`
297			`alu_status_expected[Z] = (alu_result_expected == 0) ? 1 : 0;`
298			`alu_status_expected[N] = alu_result_expected[7];`
299			`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
300			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
301			`//$display("op1 = %d op2 = %d c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);`
302			`check();`
303			`end`
304
305			`// ASL`
306			`alu_opcode = ASL_ACC;`
307			`for (i = 0; i < 1000; i = i + 1)`
308			`begin`
309			`alu_a = i;`
310	140	gabrielosh	`@(negedge clk);`
311	127	gabrielosh	`alu_status_expected[C] = alu_result_expected[7];`
312			`alu_result_expected[7:0] = alu_result_expected << 1;`
313			`alu_status_expected[Z] = (alu_result_expected == 0) ? 1 : 0;`
314			`alu_status_expected[N] = alu_result_expected[7];`
315			`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
316			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
317			`//$display("op1 = %d op2 = %d c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);`
318			`check();`
319			`end`
320
321			`// INC`
322			`alu_opcode = INC_ZPG;`
323			`for (i = 0; i < 1000; i = i + 1)`
324			`begin`
325			`alu_a = i;`
326	140	gabrielosh	`@(negedge clk);`
327	127	gabrielosh	`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
328			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
329			`//$display("op1 = %d op2 = %d c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);`
330			`alu_result_expected = alu_a + 1;`
331			`alu_status_expected[Z] = (alu_result_expected == 0) ? 1 : 0;`
332			`alu_status_expected[N] = alu_result_expected[7];`
333			`check();`
334			`end`
335
336			`// INX`
337			`alu_opcode = INX_IMP;`
338			`for (i = 0; i < 1000; i = i + 1)`
339			`begin`
340			`alu_a = i;`
341	140	gabrielosh	`@(negedge clk);`
342	127	gabrielosh	`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
343			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
344			`//$display("op1 = %d op2 = %d c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);`
345			`alu_x_expected = alu_x_expected + 1;`
346			`alu_status_expected[Z] = (alu_x_expected == 0) ? 1 : 0;`
347			`alu_status_expected[N] = alu_x_expected[7];`
348			`check();`
349			`end`
350
351			`// INY`
352			`alu_opcode = INY_IMP;`
353			`for (i = 0; i < 1000; i = i + 1)`
354			`begin`
355			`alu_a = i;`
356	140	gabrielosh	`@(negedge clk);`
357	127	gabrielosh	`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
358			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
359			`//$display("op1 = %d op2 = %d c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);`
360			`alu_y_expected = alu_y_expected + 1;`
361			`alu_status_expected[Z] = (alu_y_expected == 0) ? 1 : 0;`
362			`alu_status_expected[N] = alu_y_expected[7];`
363			`check();`
364			`end`
365
366			`// DEC`
367			`alu_opcode = DEC_ZPG;`
368			`for (i = 0; i < 1000; i = i + 1)`
369			`begin`
370			`alu_a = i;`
371	140	gabrielosh	`@(negedge clk);`
372	127	gabrielosh	`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
373			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
374			`//$display("op1 = %d op2 = %d c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);`
375			`alu_result_expected = alu_a - 1;`
376			`alu_status_expected[Z] = (alu_result_expected == 0) ? 1 : 0;`
377			`alu_status_expected[N] = alu_result_expected[7];`
378			`check();`
379			`end`
380
381			`// DEX`
382			`alu_opcode = DEX_IMP;`
383			`for (i = 0; i < 1000; i = i + 1)`
384			`begin`
385			`alu_a = i;`
386	140	gabrielosh	`@(negedge clk);`
387	127	gabrielosh	`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
388			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
389			`//$display("op1 = %d op2 = %d c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);`
390			`alu_x_expected = alu_x_expected - 1;`
391			`alu_status_expected[Z] = (alu_x_expected == 0) ? 1 : 0;`
392			`alu_status_expected[N] = alu_x_expected[7];`
393			`check();`
394			`end`
395
396			`// DEY`
397			`alu_opcode = DEY_IMP;`
398			`for (i = 0; i < 1000; i = i + 1)`
399			`begin`
400			`alu_a = i;`
401	140	gabrielosh	`@(negedge clk);`
402	127	gabrielosh	`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
403			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
404			`//$display("op1 = %d op2 = %d c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);`
405			`alu_y_expected = alu_y_expected - 1;`
406			`alu_status_expected[Z] = (alu_y_expected == 0) ? 1 : 0;`
407			`alu_status_expected[N] = alu_y_expected[7];`
408			`check();`
409			`end`
410
411
412			`// LDA`
413			`alu_a = 0;`
414			`alu_opcode = LDA_IMM;`
415			`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
416			`//$display("op1 = %d op2 = %d c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);`
417	140	gabrielosh	`@(negedge clk);`
418	127	gabrielosh	`alu_result_expected = 8'h00;`
419			`// NV1BDIZC`
420			`alu_status_expected = 8'b00100010;`
421			`check();`
422
423			`// BIT`
424			`alu_opcode = BIT_ZPG;`
425			`for (i = 0; i < 1000; i = i + 1)`
426			`begin`
427			`alu_a = i;`
428	140	gabrielosh	`@(negedge clk);`
429	127	gabrielosh	`$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
430			`$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
431			`$display("op1 = %d op2 = %d c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);`
432			`alu_status_expected[Z] = ((alu_a & alu_result_expected) == 0) ? 1 : 0;`
433			`alu_status_expected[V] = alu_a[6];`
434			`alu_status_expected[N] = alu_a[7];`
435			`check();`
436			`end`
437
438			`// SEC`
439			`alu_opcode = SEC_IMP;`
440	140	gabrielosh	`@(negedge clk);`
441	127	gabrielosh	`alu_status_expected[C] = 1;`
442			`check();`
443
444			`// SED`
445			`alu_opcode = SED_IMP;`
446	140	gabrielosh	`@(negedge clk);`
447	127	gabrielosh	`alu_status_expected[D] = 1;`
448			`check();`
449
450			`// SEI`
451			`alu_opcode = SEI_IMP;`
452	140	gabrielosh	`@(negedge clk);`
453	127	gabrielosh	`alu_status_expected[I] = 1;`
454			`check();`
455
456			`// CLC`
457			`alu_opcode = CLC_IMP;`
458	140	gabrielosh	`@(negedge clk);`
459	127	gabrielosh	`alu_status_expected[C] = 0;`
460			`check();`
461
462			`// CLD`
463			`alu_opcode = CLD_IMP;`
464	140	gabrielosh	`@(negedge clk);`
465	127	gabrielosh	`alu_status_expected[D] = 0;`
466			`check();`
467
468			`// CLI`
469			`alu_opcode = CLI_IMP;`
470	140	gabrielosh	`@(negedge clk);`
471	127	gabrielosh	`alu_status_expected[I] = 0;`
472			`check();`
473
474			`// CLV`
475			`alu_opcode = CLV_IMP;`
476	140	gabrielosh	`@(negedge clk);`
477	127	gabrielosh	`alu_status_expected[V] = 0;`
478			`check();`
479
480			`// LDA`
481			`alu_opcode = LDA_IMM;`
482			`alu_a = 8'h76;`
483	140	gabrielosh	`@(negedge clk);`
484	127	gabrielosh	`alu_result_expected = alu_a;`
485			`alu_status_expected[Z] = (alu_result_expected == 0) ? 1 : 0;`
486			`alu_status_expected[N] = alu_result_expected[7];`
487			`check();`
488
489			`// TAX`
490			`alu_opcode = TAX_IMP;`
491	140	gabrielosh	`@(negedge clk);`
492	127	gabrielosh	`alu_x_expected = alu_result_expected;`
493			`alu_status_expected[Z] = (alu_x_expected == 0) ? 1 : 0;`
494			`alu_status_expected[N] = alu_x_expected[7];`
495			`check();`
496
497			`// TAY`
498			`alu_opcode = TAY_IMP;`
499	140	gabrielosh	`@(negedge clk);`
500	127	gabrielosh	`alu_y_expected = alu_result_expected;`

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