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[/] [t6507lp/] [trunk/] [rtl/] [verilog/] [t6507lp_alu_tb.v] - Blame information for rev 181

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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_in;
reg C_temp;
reg [7:0] temp1;
reg [7:0] temp2;
reg sign;
reg [3:0] AL;
reg [3:0] AH;
reg [3:0] BL;
reg [3:0] BH;
reg [7:0] alu_result_expected_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("Instruction %h... OK!", alu_opcode);
                end
                else
                begin
                        $display("ERROR at instruction %h",alu_opcode);
                        $finish;
                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
                alu_a = $random;
                @(negedge clk);
                //$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], DUT.result);
                sign = alu_result_expected[7];
                {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] == sign) && (alu_a[7] != alu_result_expected[7]));
                check;
        end
 
        // BCD
        // 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[N] = 0;
        alu_status_expected[Z] = 1;
        check;
        // SED
        alu_opcode = SED_IMP;
        //$display("A = %h B = %h X = %h Y = %h", alu_result, alu_a, alu_x, alu_y);
        @(negedge clk);
        alu_status_expected[D] = 1;
        check;
 
        // ADC
        alu_opcode = ADC_IMM;
        for (i = 0; i < 1000; i = i + 1)
        begin
                alu_a = $random;
                //$display("A = %h B = %h C = %b X = %h Y = %h", alu_result, alu_a, alu_status_expected[C], alu_x, alu_y);
                @(negedge clk);
                C_temp = 0;
                sign = alu_result_expected[7];
                AL = alu_a[3:0];
                AH = alu_a[7:4];
                BL = alu_result_expected[3:0];
                BH = alu_result_expected[7:4];
                /*
                if (AL > 9) begin
                        AL = AL - 10;
                        AH = AH + 1;
                end
                if ( AH > 9 ) begin
                        AH = AH - 10;
                        C_temp = 1;
                end
                if (BL > 9) begin
                        BL = BL - 10;
                        BH = BH + 1;
                end
                if ( BH > 9 ) begin
                        BH = BH - 10;
                        C_temp = 1;
                end
                */
                //$display("AL = %h BL = %h", AL, BL, );
                temp1 = AL + BL + alu_status_expected[C];
                //AH = A[7:4] + alu_a[7:4];
                temp2 = AH + BH;
                //$display("temp1 = %h temp2 = %h", temp1, temp2);
                if (temp1 > 9) begin
                        temp2 = temp2 + (temp1 / 10);
                        temp1 = temp1 % 10;
                end
                if (temp2 > 9) begin
                        alu_status_expected[C] = 1;
                        temp2 = temp2 % 10;
                end
                else begin
                        alu_status_expected[C] = 0;
                end
                //$display("bcdh2 = %d", bcdh2);
                //$display("bcdl = %d", bcdl);
                alu_result_expected = {temp2[3:0],temp1[3:0]};
                //{C_in,alu_result_expected[3:0]} = AL + BL + alu_status_expected[C];
                //{alu_status_expected[C],alu_result_expected[7:4]} = AH + BH + C_in;
                //if ( alu_result_expected[3:0] > 9 ) begin
                //      alu_result_expected[3:0] = alu_result_expected[3:0] - 10;
        //              alu_result_expected[7:4] = alu_result_expected[7:4] + 1;
                //end
                //if ( alu_result_expected[7:4] > 9 ) begin
                //      alu_result_expected[7:4] = alu_result_expected[7:4] - 10;
        //              alu_status_expected[C] = 1;
                //end
                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] == sign) && (alu_a[7] != alu_result_expected[7]));
                check;
        end
        //$stop;
        // CLD
        alu_opcode = CLD_IMP;
        @(negedge clk);
        alu_status_expected[D] = 0;
        check;
 
        // SBC BCD
        // 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[N] = 0;
        alu_status_expected[Z] = 1;
        check;
        // SED
        alu_opcode = SED_IMP;
        $display("A = %h B = %h X = %h Y = %h", alu_result, alu_a, alu_x, alu_y);
        @(negedge clk);
        alu_status_expected[D] = 1;
        check;
 
        // ADC
        alu_opcode = SBC_IMM;
        for (i = 0; i < 1000; i = i + 1)
        begin
                alu_a = $random;
                $display("A = %h B = %h C = %b X = %h Y = %h", alu_result, alu_a, alu_status_expected[C], alu_x, alu_y);
                @(negedge clk);
                C_temp = 0;
                sign   = alu_a[7];
                AL     = alu_a[3:0];
                AH     = alu_a[7:4];
                BL     = ~alu_result_expected[3:0];
                BH     = ~alu_result_expected[7:4];
                /*
                if (AL > 9) begin
                        AL = AL - 10;
                        AH = AH + 1;
                end
                if ( AH > 9 ) begin
                        AH = AH - 10;
                        C_temp = 1;
                end
                if (BL > 9) begin
                        BL = BL - 10;
                        BH = BH + 1;
                end
                if ( BH > 9 ) begin
                        BH = BH - 10;
                        C_temp = 1;
                end
                */
 
                //$display("AL = %h BL = %h", AL, BL, );
                temp1 = AL + BL + alu_status_expected[C];
                //AH = A[7:4] + alu_a[7:4];
                temp2 = AH + BH;
                //$display("temp1 = %h temp2 = %h", temp1, temp2);
                if (temp1 > 9) begin
                        temp2 = temp2 + (temp1 / 10);
                        temp1 = temp1 % 10;
                end
                if (temp2 > 9) begin
                        alu_status_expected[C] = 1;
                        temp2 = temp2 % 10;
                end
                else begin
                        alu_status_expected[C] = 0;
                end
                //$display("bcdh2 = %d", bcdh2);
                //$display("bcdl = %d", bcdl);
                alu_result_expected = {temp2[3:0],temp1[3:0]};
                //{C_in,alu_result_expected[3:0]} = AL + BL + alu_status_expected[C];
                //{alu_status_expected[C],alu_result_expected[7:4]} = AH + BH + C_in;
                //if ( alu_result_expected[3:0] > 9 ) begin
                //      alu_result_expected[3:0] = alu_result_expected[3:0] - 10;
        //              alu_result_expected[7:4] = alu_result_expected[7:4] + 1;
                //end
                //if ( alu_result_expected[7:4] > 9 ) begin
                //      alu_result_expected[7:4] = alu_result_expected[7:4] - 10;
        //              alu_status_expected[C] = 1;
                //end
                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] == sign) && (alu_a[7] != alu_result_expected[7]));
                check;
        end
        $stop;
        // CLD
        alu_opcode = CLD_IMP;
        @(negedge clk);
        alu_status_expected[D] = 0;
        check;
 
        // ASL
        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 = 137;
        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'd137;
        //                       NV1BDIZC
        alu_status_expected[Z] = (alu_result_expected == 0) ? 1 : 0;
        alu_status_expected[N] = alu_result_expected[7];
        check;
 
        // EOR
        alu_opcode = EOR_IMM;
        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);
                //$display("op1 = %d op2 = %d  c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);
                //$display("result_expected = %d",alu_result_expected);
                alu_result_expected = alu_a ^ alu_result_expected;
                alu_status_expected[Z] = (alu_result_expected == 0) ? 1 : 0;
                alu_status_expected[N] = alu_result_expected[7];
                //$display("result_expected = %d", alu_result_expected);
                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);
                //$display("op1 = %d op2 = %d  c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);
                sign = alu_result_expected[7];
                alu_result_expected = alu_result_expected - alu_a - ( 1 - alu_status_expected[C]);
                alu_status_expected[C] = ~alu_result_expected[7];
                alu_status_expected[Z] = (alu_result_expected == 0) ? 1 : 0;
                alu_status_expected[N] = alu_result_expected[7];
                //$display("alu_a[7] = %b == sign = %b && alu_a[7] = %b != alu_result_expected[7] = %b", alu_a[7], sign, alu_a[7], alu_result_expected[7]);
                alu_status_expected[V] = ((alu_a[7] == sign) && (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 = alu_a;
                //$display("alu_x_expected = %h", alu_x_expected);
                //alu_result_expected = i;
                alu_status_expected[Z] = (alu_x_expected == 0) ? 1 : 0;
                alu_status_expected[N] = alu_x_expected[7];
                //$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 = alu_a;
                //$display("alu_y_expected = %h", alu_y_expected);
                //alu_result_expected = i;
                alu_status_expected[Z] = (alu_y_expected == 0) ? 1 : 0;
                alu_status_expected[N] = alu_y_expected[7];
                //$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);
                //alu_result_expected = alu_a;
                //alu_result_expected = DUT.A;
                check;
        end
 
        // STX
        alu_opcode = STX_ABS;
        for (i = 0; i < 1000; i = i + 1)
        begin
                alu_a = i;
                @(negedge clk);
                //$display("alu_x_expected = %h", alu_x_expected);
                //alu_result_expected = i;
                //alu_x_expected = alu_a;
                //$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);
                //$display("alu_y_expected = %h", alu_y_expected);
                //alu_result_expected = i;
                //alu_y_expected = alu_a;
                //$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);
                temp1 = alu_result_expected - alu_a;
                alu_status_expected[Z] = (temp1 == 0) ? 1 : 0;
                alu_status_expected[N] = temp1[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);
                temp1 = alu_x_expected - alu_a;
                alu_status_expected[Z] = (temp1 == 0) ? 1 : 0;
                alu_status_expected[N] = temp1[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);
                temp1 = alu_y_expected - alu_a;
                alu_status_expected[Z] = (temp1 == 0) ? 1 : 0;
                alu_status_expected[N] = temp1[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 = alu_a & 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
 
        // RTI
        alu_opcode = RTI_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_status_expected[C] = alu_a[C];
                alu_status_expected[Z] = alu_a[Z];
                alu_status_expected[N] = alu_a[N];
                alu_status_expected[V] = alu_a[V];
                alu_status_expected[B] = alu_a[B];
                alu_status_expected[D] = alu_a[D];
                alu_status_expected[I] = alu_a[I];
                check;
        end
 
        // PLP
        alu_opcode = PLP_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_status_expected[C] = alu_a[C];
                alu_status_expected[Z] = alu_a[Z];
                alu_status_expected[N] = alu_a[N];
                alu_status_expected[V] = alu_a[V];
                alu_status_expected[B] = alu_a[B];
                alu_status_expected[D] = alu_a[D];
                alu_status_expected[I] = alu_a[I];
                check;
        end
 
        // PHA
        alu_opcode = PHA_IMP;
        @(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 = DUT.A;
        //alu_result_expected = alu_a;
        check;
 
        // PHP
        alu_opcode = PHP_IMP;
        @(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 = DUT.STATUS;
        check;
 
        // BRK
        alu_opcode = BRK_IMP;
        @(negedge clk);
        alu_status_expected[B] = 1;
        check;
 
        // 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	164	gabrielosh	`reg C_in;`
23	181	gabrielosh	`reg C_temp;`
24			`reg [7:0] temp1;`
25			`reg [7:0] temp2;`
26	156	gabrielosh	`reg sign;`
27	164	gabrielosh	`reg [3:0] AL;`
28			`reg [3:0] AH;`
29			`reg [3:0] BL;`
30			`reg [3:0] BH;`
31			`reg [7:0] alu_result_expected_temp;`
32	127	gabrielosh
33	136	gabrielosh	`t6507lp_alu DUT (`
34			`.clk (clk),`
35			`.reset_n (reset_n),`
36	127	gabrielosh	`.alu_enable (alu_enable),`
37			`.alu_result (alu_result),`
38			`.alu_status (alu_status),`
39			`.alu_opcode (alu_opcode),`
40			`.alu_a (alu_a),`
41			`.alu_x (alu_x),`
42			`.alu_y (alu_y)`
43			`);`
44
45
46			`localparam period = 10;`
47
48			`task check;`
49			`begin`
50			`$display(" RESULTS EXPECTED");`
51			`$display("alu_result %h %h ", alu_result, alu_result_expected);`
52			`$display("alu_status %b %b ", alu_status, alu_status_expected);`
53			`$display("alu_x %h %h ", alu_x, alu_x_expected );`
54			`$display("alu_y %h %h ", alu_y, alu_y_expected );`
55	150	gabrielosh	`if ((alu_result_expected == alu_result) && (alu_status_expected == alu_status) && (alu_x_expected == alu_x) && (alu_y_expected == alu_y))`
56	127	gabrielosh	`begin`
57	150	gabrielosh	`$display("Instruction %h... OK!", alu_opcode);`
58	127	gabrielosh	`end`
59			`else`
60			`begin`
61	150	gabrielosh	`$display("ERROR at instruction %h",alu_opcode);`
62			`$finish;`
63	127	gabrielosh	`end`
64			`end`
65			`endtask`
66
67
68			`always begin`
69	136	gabrielosh	`#(period/2) clk = ~clk;`
70	127	gabrielosh	`end`
71
72			`initial`
73			`begin`
74			`// Reset`
75	136	gabrielosh	`clk = 0;`
76			`reset_n = 0;`
77	140	gabrielosh	`@(negedge clk);`
78	150	gabrielosh	`//@(negedge clk);`
79	148	gabrielosh	`reset_n = 1;`
80	127	gabrielosh	`alu_enable = 1;`
81			`alu_result_expected = 8'h00;`
82			`alu_status_expected = 8'b00100010;`
83			`alu_x_expected = 8'h00;`
84			`alu_y_expected = 8'h00;`
85
86			`// LDA`
87			`alu_a = 0;`
88			`alu_opcode = LDA_IMM;`
89			`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
90			`//$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);`
91	140	gabrielosh	`@(negedge clk);`
92	127	gabrielosh	`alu_result_expected = 8'h00;`
93			`// NV1BDIZC`
94	149	gabrielosh	`alu_status_expected = 8'b00100010;`
95	173	gabrielosh	`check;`
96	127	gabrielosh
97			`// ADC`
98			`alu_opcode = ADC_IMM;`
99			`alu_a = 1;`
100			`for (i = 0; i < 1000; i = i + 1)`
101			`begin`
102	149	gabrielosh	`alu_a = $random;`
103	140	gabrielosh	`@(negedge clk);`
104	149	gabrielosh	`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
105			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
106			`//$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], DUT.result);`
107	156	gabrielosh	`sign = alu_result_expected[7];`
108	127	gabrielosh	`{alu_status_expected[C], alu_result_expected} = alu_a + alu_result_expected + alu_status_expected[C];`
109			`alu_status_expected[Z] = (alu_result_expected == 0) ? 1 : 0;`
110			`alu_status_expected[N] = alu_result_expected[7];`
111	156	gabrielosh	`alu_status_expected[V] = ((alu_a[7] == sign) && (alu_a[7] != alu_result_expected[7]));`
112	173	gabrielosh	`check;`
113	127	gabrielosh	`end`
114	169	gabrielosh
115	164	gabrielosh	`// BCD`
116	161	gabrielosh	`// LDA`
117			`alu_a = 0;`
118			`alu_opcode = LDA_IMM;`
119			`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
120			`//$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);`
121			`@(negedge clk);`
122			`alu_result_expected = 8'h00;`
123			`// NV1BDIZC`
124	164	gabrielosh	`alu_status_expected[N] = 0;`
125			`alu_status_expected[Z] = 1;`
126	173	gabrielosh	`check;`
127	164	gabrielosh	`// SED`
128			`alu_opcode = SED_IMP;`
129	181	gabrielosh	`//$display("A = %h B = %h X = %h Y = %h", alu_result, alu_a, alu_x, alu_y);`
130	164	gabrielosh	`@(negedge clk);`
131			`alu_status_expected[D] = 1;`
132	173	gabrielosh	`check;`
133	161	gabrielosh
134			`// ADC`
135			`alu_opcode = ADC_IMM;`
136			`for (i = 0; i < 1000; i = i + 1)`
137			`begin`
138			`alu_a = $random;`
139	181	gabrielosh	`//$display("A = %h B = %h C = %b X = %h Y = %h", alu_result, alu_a, alu_status_expected[C], alu_x, alu_y);`
140	161	gabrielosh	`@(negedge clk);`
141	181	gabrielosh	`C_temp = 0;`
142	161	gabrielosh	`sign = alu_result_expected[7];`
143	164	gabrielosh	`AL = alu_a[3:0];`
144			`AH = alu_a[7:4];`
145			`BL = alu_result_expected[3:0];`
146			`BH = alu_result_expected[7:4];`
147	181	gabrielosh	`/*`
148			`if (AL > 9) begin`
149	164	gabrielosh	`AL = AL - 10;`
150			`AH = AH + 1;`
151			`end`
152	181	gabrielosh	`if ( AH > 9 ) begin`
153	164	gabrielosh	`AH = AH - 10;`
154	181	gabrielosh	`C_temp = 1;`
155	164	gabrielosh	`end`
156	181	gabrielosh	`if (BL > 9) begin`
157	164	gabrielosh	`BL = BL - 10;`
158			`BH = BH + 1;`
159			`end`
160			`if ( BH > 9 ) begin`
161			`BH = BH - 10;`
162	181	gabrielosh	`C_temp = 1;`
163	164	gabrielosh	`end`
164	181	gabrielosh	`*/`
165			`//$display("AL = %h BL = %h", AL, BL, );`
166			`temp1 = AL + BL + alu_status_expected[C];`
167			`//AH = A[7:4] + alu_a[7:4];`
168			`temp2 = AH + BH;`
169			`//$display("temp1 = %h temp2 = %h", temp1, temp2);`
170			`if (temp1 > 9) begin`
171			`temp2 = temp2 + (temp1 / 10);`
172			`temp1 = temp1 % 10;`
173	164	gabrielosh	`end`
174	181	gabrielosh	`if (temp2 > 9) begin`
175	165	gabrielosh	`alu_status_expected[C] = 1;`
176	181	gabrielosh	`temp2 = temp2 % 10;`
177	164	gabrielosh	`end`
178	181	gabrielosh	`else begin`
179			`alu_status_expected[C] = 0;`
180			`end`
181			`//$display("bcdh2 = %d", bcdh2);`
182			`//$display("bcdl = %d", bcdl);`
183			`alu_result_expected = {temp2[3:0],temp1[3:0]};`
184			`//{C_in,alu_result_expected[3:0]} = AL + BL + alu_status_expected[C];`
185			`//{alu_status_expected[C],alu_result_expected[7:4]} = AH + BH + C_in;`
186			`//if ( alu_result_expected[3:0] > 9 ) begin`
187			`// alu_result_expected[3:0] = alu_result_expected[3:0] - 10;`
188			`// alu_result_expected[7:4] = alu_result_expected[7:4] + 1;`
189			`//end`
190			`//if ( alu_result_expected[7:4] > 9 ) begin`
191			`// alu_result_expected[7:4] = alu_result_expected[7:4] - 10;`
192			`// alu_status_expected[C] = 1;`
193			`//end`
194	161	gabrielosh	`alu_status_expected[Z] = (alu_result_expected == 0) ? 1 : 0;`
195			`alu_status_expected[N] = alu_result_expected[7];`
196			`alu_status_expected[V] = ((alu_a[7] == sign) && (alu_a[7] != alu_result_expected[7]));`
197	173	gabrielosh	`check;`
198	179	gabrielosh	`end`
199	181	gabrielosh	`//$stop;`
200	179	gabrielosh	`// CLD`
201			`alu_opcode = CLD_IMP;`
202			`@(negedge clk);`
203			`alu_status_expected[D] = 0;`
204			`check;`
205
206	181	gabrielosh	`// SBC BCD`
207			`// LDA`
208			`alu_a = 0;`
209			`alu_opcode = LDA_IMM;`
210			`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
211			`//$display("op1 = %d op2 = %d c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);`
212			`@(negedge clk);`
213			`alu_result_expected = 8'h00;`
214			`// NV1BDIZC`
215			`alu_status_expected[N] = 0;`
216			`alu_status_expected[Z] = 1;`
217			`check;`
218			`// SED`
219			`alu_opcode = SED_IMP;`
220			`$display("A = %h B = %h X = %h Y = %h", alu_result, alu_a, alu_x, alu_y);`
221			`@(negedge clk);`
222			`alu_status_expected[D] = 1;`
223			`check;`
224
225			`// ADC`
226			`alu_opcode = SBC_IMM;`
227			`for (i = 0; i < 1000; i = i + 1)`
228			`begin`
229			`alu_a = $random;`
230			`$display("A = %h B = %h C = %b X = %h Y = %h", alu_result, alu_a, alu_status_expected[C], alu_x, alu_y);`
231			`@(negedge clk);`
232			`C_temp = 0;`
233			`sign = alu_a[7];`
234			`AL = alu_a[3:0];`
235			`AH = alu_a[7:4];`
236			`BL = ~alu_result_expected[3:0];`
237			`BH = ~alu_result_expected[7:4];`
238			`/*`
239			`if (AL > 9) begin`
240			`AL = AL - 10;`
241			`AH = AH + 1;`
242			`end`
243			`if ( AH > 9 ) begin`
244			`AH = AH - 10;`
245			`C_temp = 1;`
246			`end`
247			`if (BL > 9) begin`
248			`BL = BL - 10;`
249			`BH = BH + 1;`
250			`end`
251			`if ( BH > 9 ) begin`
252			`BH = BH - 10;`
253			`C_temp = 1;`
254			`end`
255			`*/`
256
257			`//$display("AL = %h BL = %h", AL, BL, );`
258			`temp1 = AL + BL + alu_status_expected[C];`
259			`//AH = A[7:4] + alu_a[7:4];`
260			`temp2 = AH + BH;`
261			`//$display("temp1 = %h temp2 = %h", temp1, temp2);`
262			`if (temp1 > 9) begin`
263			`temp2 = temp2 + (temp1 / 10);`
264			`temp1 = temp1 % 10;`
265			`end`
266			`if (temp2 > 9) begin`
267			`alu_status_expected[C] = 1;`
268			`temp2 = temp2 % 10;`
269			`end`
270			`else begin`
271			`alu_status_expected[C] = 0;`
272			`end`
273			`//$display("bcdh2 = %d", bcdh2);`
274			`//$display("bcdl = %d", bcdl);`
275			`alu_result_expected = {temp2[3:0],temp1[3:0]};`
276			`//{C_in,alu_result_expected[3:0]} = AL + BL + alu_status_expected[C];`
277			`//{alu_status_expected[C],alu_result_expected[7:4]} = AH + BH + C_in;`
278			`//if ( alu_result_expected[3:0] > 9 ) begin`
279			`// alu_result_expected[3:0] = alu_result_expected[3:0] - 10;`
280			`// alu_result_expected[7:4] = alu_result_expected[7:4] + 1;`
281			`//end`
282			`//if ( alu_result_expected[7:4] > 9 ) begin`
283			`// alu_result_expected[7:4] = alu_result_expected[7:4] - 10;`
284			`// alu_status_expected[C] = 1;`
285			`//end`
286			`alu_status_expected[Z] = (alu_result_expected == 0) ? 1 : 0;`
287			`alu_status_expected[N] = alu_result_expected[7];`
288			`alu_status_expected[V] = ((alu_a[7] == sign) && (alu_a[7] != alu_result_expected[7]));`
289			`check;`
290			`end`
291			`$stop;`
292			`// CLD`
293			`alu_opcode = CLD_IMP;`
294			`@(negedge clk);`
295			`alu_status_expected[D] = 0;`
296			`check;`
297
298	148	gabrielosh	`// ASL`
299	145	gabrielosh	`alu_opcode = ASL_ABS;`
300			`for (i = 0; i < 1000; i = i + 1)`
301			`begin`
302			`alu_a = i;`
303			`@(negedge clk);`
304			`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
305			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
306			`//$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);`
307			`{alu_status_expected[C], alu_result_expected} = {alu_a,1'b0};`
308			`alu_status_expected[Z] = (alu_result_expected == 0) ? 1 : 0;`
309			`alu_status_expected[N] = alu_result_expected[7];`
310	173	gabrielosh	`check;`
311	145	gabrielosh	`end`
312
313			`// LDA`
314	156	gabrielosh	`alu_a = 137;`
315			`alu_opcode = LDA_IMM;`
316			`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
317			`//$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			`@(negedge clk);`
319			`alu_result_expected = 8'd137;`
320			`// NV1BDIZC`
321			`alu_status_expected[Z] = (alu_result_expected == 0) ? 1 : 0;`
322			`alu_status_expected[N] = alu_result_expected[7];`
323	173	gabrielosh	`check;`
324	156	gabrielosh
325			`// EOR`
326			`alu_opcode = EOR_IMM;`
327			`for (i = 0; i < 1000; i = i + 1)`
328			`begin`
329			`alu_a = i;`
330			`@(negedge clk);`
331			`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
332			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
333			`//$display("op1 = %d op2 = %d c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);`
334	179	gabrielosh	`//$display("result_expected = %d",alu_result_expected);`
335	156	gabrielosh	`alu_result_expected = alu_a ^ alu_result_expected;`
336			`alu_status_expected[Z] = (alu_result_expected == 0) ? 1 : 0;`
337			`alu_status_expected[N] = alu_result_expected[7];`
338	179	gabrielosh	`//$display("result_expected = %d", alu_result_expected);`
339	173	gabrielosh	`check;`
340	156	gabrielosh	`end`
341
342			`// LDA`
343	145	gabrielosh	`alu_a = 0;`
344			`alu_opcode = LDA_IMM;`
345			`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
346			`//$display("op1 = %d op2 = %d c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);`
347			`@(negedge clk);`
348			`alu_result_expected = 8'h00;`
349			`// NV1BDIZC`
350			`alu_status_expected[Z] = (alu_result_expected == 0) ? 1 : 0;`
351			`alu_status_expected[N] = alu_result_expected[7];`
352	173	gabrielosh	`check;`
353	145	gabrielosh
354	127	gabrielosh	`// SBC`
355			`alu_opcode = SBC_IMM;`
356			`for (i = 0; i < 1000; i = i + 1)`
357			`begin`
358	145	gabrielosh	`alu_a = 1;`
359	140	gabrielosh	`@(negedge clk);`
360	174	gabrielosh	`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
361			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
362			`//$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);`
363	156	gabrielosh	`sign = alu_result_expected[7];`
364	174	gabrielosh	`alu_result_expected = alu_result_expected - alu_a - ( 1 - alu_status_expected[C]);`
365			`alu_status_expected[C] = ~alu_result_expected[7];`
366	127	gabrielosh	`alu_status_expected[Z] = (alu_result_expected == 0) ? 1 : 0;`
367			`alu_status_expected[N] = alu_result_expected[7];`
368	174	gabrielosh	`//$display("alu_a[7] = %b == sign = %b && alu_a[7] = %b != alu_result_expected[7] = %b", alu_a[7], sign, alu_a[7], alu_result_expected[7]);`
369	156	gabrielosh	`alu_status_expected[V] = ((alu_a[7] == sign) && (alu_a[7] != alu_result_expected[7]));`
370	173	gabrielosh	`check;`
371	127	gabrielosh	`end`
372
373			`// LDA`
374			`alu_opcode = LDA_IMM;`
375			`for (i = 0; i < 1000; i = i + 1)`
376			`begin`
377			`alu_a = i;`
378	140	gabrielosh	`@(negedge clk);`
379	127	gabrielosh	`alu_result_expected = i;`
380			`alu_status_expected[Z] = (alu_result_expected == 0) ? 1 : 0;`
381			`alu_status_expected[N] = alu_result_expected[7];`
382			`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
383			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
384			`//$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);`
385	173	gabrielosh	`check;`
386	127	gabrielosh	`end`
387
388			`// LDX`
389			`alu_opcode = LDX_IMM;`
390			`for (i = 0; i < 1000; i = i + 1)`
391			`begin`
392			`alu_a = i;`
393	140	gabrielosh	`@(negedge clk);`
394	178	gabrielosh	`alu_x_expected = alu_a;`
395	179	gabrielosh	`//$display("alu_x_expected = %h", alu_x_expected);`
396	127	gabrielosh	`//alu_result_expected = i;`
397			`alu_status_expected[Z] = (alu_x_expected == 0) ? 1 : 0;`
398			`alu_status_expected[N] = alu_x_expected[7];`
399			`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
400			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
401			`//$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);`
402	173	gabrielosh	`check;`
403	127	gabrielosh	`end`
404
405			`// LDY`
406			`alu_opcode = LDY_IMM;`
407			`for (i = 0; i < 1001; i = i + 1)`
408			`begin`
409			`alu_a = i;`
410	140	gabrielosh	`@(negedge clk);`
411	178	gabrielosh	`alu_y_expected = alu_a;`
412	179	gabrielosh	`//$display("alu_y_expected = %h", alu_y_expected);`
413	127	gabrielosh	`//alu_result_expected = i;`
414			`alu_status_expected[Z] = (alu_y_expected == 0) ? 1 : 0;`
415			`alu_status_expected[N] = alu_y_expected[7];`
416			`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
417			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
418			`//$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);`
419	173	gabrielosh	`check;`
420	127	gabrielosh	`end`
421
422			`// STA`
423			`alu_opcode = STA_ABS;`
424			`for (i = 0; i < 1000; i = i + 1)`
425			`begin`
426			`alu_a = i;`
427	140	gabrielosh	`@(negedge clk);`
428	127	gabrielosh	`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
429			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
430			`//$display("op1 = %d op2 = %d c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);`
431	178	gabrielosh	`//alu_result_expected = alu_a;`
432			`//alu_result_expected = DUT.A;`
433	173	gabrielosh	`check;`
434	127	gabrielosh	`end`
435
436			`// STX`
437			`alu_opcode = STX_ABS;`
438			`for (i = 0; i < 1000; i = i + 1)`
439			`begin`
440			`alu_a = i;`
441	140	gabrielosh	`@(negedge clk);`
442	179	gabrielosh	`//$display("alu_x_expected = %h", alu_x_expected);`
443	127	gabrielosh	`//alu_result_expected = i;`
444	178	gabrielosh	`//alu_x_expected = alu_a;`
445	127	gabrielosh	`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
446			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
447			`//$display("op1 = %d op2 = %d c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);`
448	173	gabrielosh	`check;`
449	127	gabrielosh	`end`
450
451			`// STY`
452			`alu_opcode = STY_ABS;`
453			`for (i = 0; i < 1000; i = i + 1)`
454			`begin`
455			`alu_a = i;`
456	140	gabrielosh	`@(negedge clk);`
457	179	gabrielosh	`//$display("alu_y_expected = %h", alu_y_expected);`
458	127	gabrielosh	`//alu_result_expected = i;`
459	178	gabrielosh	`//alu_y_expected = alu_a;`
460	127	gabrielosh	`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
461			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
462			`//$display("op1 = %d op2 = %d c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);`
463	173	gabrielosh	`check;`
464	127	gabrielosh	`end`
465
466			`// CMP`
467			`alu_opcode = CMP_IMM;`
468			`for (i = 0; i < 1000; i = i + 1)`
469			`begin`
470			`alu_a = i;`
471	140	gabrielosh	`@(negedge clk);`
472	181	gabrielosh	`temp1 = alu_result_expected - alu_a;`
473			`alu_status_expected[Z] = (temp1 == 0) ? 1 : 0;`
474			`alu_status_expected[N] = temp1[7];`
475	127	gabrielosh	`alu_status_expected[C] = (alu_result_expected >= alu_a) ? 1 : 0;`
476			`//alu_result_expected = i;`
477			`//alu_y_expected = i;`
478			`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
479			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
480			`//$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);`
481	173	gabrielosh	`check;`
482	127	gabrielosh	`end`
483
484			`// CPX`
485			`alu_opcode = CPX_IMM;`
486			`for (i = 0; i < 1000; i = i + 1)`
487			`begin`
488			`alu_a = i;`
489	140	gabrielosh	`@(negedge clk);`
490	181	gabrielosh	`temp1 = alu_x_expected - alu_a;`
491			`alu_status_expected[Z] = (temp1 == 0) ? 1 : 0;`
492			`alu_status_expected[N] = temp1[7];`
493	127	gabrielosh	`alu_status_expected[C] = (alu_x_expected >= alu_a) ? 1 : 0;`
494			`//alu_result_expected = i;`
495			`//alu_y_expected = i;`
496			`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
497			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
498			`//$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);`
499	173	gabrielosh	`check;`
500	127	gabrielosh	`end`

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