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[/] [t6507lp/] [trunk/] [rtl/] [verilog/] [t6507lp_alu_tb.v] - Blame information for rev 179

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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 [7:0] temp;
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;
        @(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;
                @(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];
                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;
                end
                if ( BL > 9 ) begin
                        BL = BL - 10;
                        BH = BH + 1;
                end
                if ( BH > 9 ) begin
                        BH = BH - 10;
                end
                {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);
                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 = 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	127	gabrielosh	`reg [7:0] temp;`
24	156	gabrielosh	`reg sign;`
25	164	gabrielosh	`reg [3:0] AL;`
26			`reg [3:0] AH;`
27			`reg [3:0] BL;`
28			`reg [3:0] BH;`
29			`reg [7:0] alu_result_expected_temp;`
30	127	gabrielosh
31	136	gabrielosh	`t6507lp_alu DUT (`
32			`.clk (clk),`
33			`.reset_n (reset_n),`
34	127	gabrielosh	`.alu_enable (alu_enable),`
35			`.alu_result (alu_result),`
36			`.alu_status (alu_status),`
37			`.alu_opcode (alu_opcode),`
38			`.alu_a (alu_a),`
39			`.alu_x (alu_x),`
40			`.alu_y (alu_y)`
41			`);`
42
43
44			`localparam period = 10;`
45
46			`task check;`
47			`begin`
48			`$display(" RESULTS EXPECTED");`
49			`$display("alu_result %h %h ", alu_result, alu_result_expected);`
50			`$display("alu_status %b %b ", alu_status, alu_status_expected);`
51			`$display("alu_x %h %h ", alu_x, alu_x_expected );`
52			`$display("alu_y %h %h ", alu_y, alu_y_expected );`
53	150	gabrielosh	`if ((alu_result_expected == alu_result) && (alu_status_expected == alu_status) && (alu_x_expected == alu_x) && (alu_y_expected == alu_y))`
54	127	gabrielosh	`begin`
55	150	gabrielosh	`$display("Instruction %h... OK!", alu_opcode);`
56	127	gabrielosh	`end`
57			`else`
58			`begin`
59	150	gabrielosh	`$display("ERROR at instruction %h",alu_opcode);`
60			`$finish;`
61	127	gabrielosh	`end`
62			`end`
63			`endtask`
64
65
66			`always begin`
67	136	gabrielosh	`#(period/2) clk = ~clk;`
68	127	gabrielosh	`end`
69
70			`initial`
71			`begin`
72			`// Reset`
73	136	gabrielosh	`clk = 0;`
74			`reset_n = 0;`
75	140	gabrielosh	`@(negedge clk);`
76	150	gabrielosh	`//@(negedge clk);`
77	148	gabrielosh	`reset_n = 1;`
78	127	gabrielosh	`alu_enable = 1;`
79			`alu_result_expected = 8'h00;`
80			`alu_status_expected = 8'b00100010;`
81			`alu_x_expected = 8'h00;`
82			`alu_y_expected = 8'h00;`
83
84			`// LDA`
85			`alu_a = 0;`
86			`alu_opcode = LDA_IMM;`
87			`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
88			`//$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);`
89	140	gabrielosh	`@(negedge clk);`
90	127	gabrielosh	`alu_result_expected = 8'h00;`
91			`// NV1BDIZC`
92	149	gabrielosh	`alu_status_expected = 8'b00100010;`
93	173	gabrielosh	`check;`
94	127	gabrielosh
95			`// ADC`
96			`alu_opcode = ADC_IMM;`
97			`alu_a = 1;`
98			`for (i = 0; i < 1000; i = i + 1)`
99			`begin`
100	149	gabrielosh	`alu_a = $random;`
101	140	gabrielosh	`@(negedge clk);`
102	149	gabrielosh	`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
103			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
104			`//$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);`
105	156	gabrielosh	`sign = alu_result_expected[7];`
106	127	gabrielosh	`{alu_status_expected[C], alu_result_expected} = alu_a + alu_result_expected + alu_status_expected[C];`
107			`alu_status_expected[Z] = (alu_result_expected == 0) ? 1 : 0;`
108			`alu_status_expected[N] = alu_result_expected[7];`
109	156	gabrielosh	`alu_status_expected[V] = ((alu_a[7] == sign) && (alu_a[7] != alu_result_expected[7]));`
110	173	gabrielosh	`check;`
111	127	gabrielosh	`end`
112	169	gabrielosh
113	164	gabrielosh	`// BCD`
114	161	gabrielosh	`// LDA`
115			`alu_a = 0;`
116			`alu_opcode = LDA_IMM;`
117			`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
118			`//$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);`
119			`@(negedge clk);`
120			`alu_result_expected = 8'h00;`
121			`// NV1BDIZC`
122	164	gabrielosh	`alu_status_expected[N] = 0;`
123			`alu_status_expected[Z] = 1;`
124	173	gabrielosh	`check;`
125	164	gabrielosh	`// SED`
126			`alu_opcode = SED_IMP;`
127			`@(negedge clk);`
128			`alu_status_expected[D] = 1;`
129	173	gabrielosh	`check;`
130	161	gabrielosh
131			`// ADC`
132			`alu_opcode = ADC_IMM;`
133			`for (i = 0; i < 1000; i = i + 1)`
134			`begin`
135			`alu_a = $random;`
136			`@(negedge clk);`
137	164	gabrielosh	`$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
138			`$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
139			`$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);`
140	161	gabrielosh	`sign = alu_result_expected[7];`
141	164	gabrielosh	`AL = alu_a[3:0];`
142			`AH = alu_a[7:4];`
143			`BL = alu_result_expected[3:0];`
144			`BH = alu_result_expected[7:4];`
145			`if ( AL > 9 ) begin`
146			`AL = AL - 10;`
147			`AH = AH + 1;`
148			`end`
149			`if (AH > 9) begin`
150			`AH = AH - 10;`
151			`end`
152			`if ( BL > 9 ) begin`
153			`BL = BL - 10;`
154			`BH = BH + 1;`
155			`end`
156			`if ( BH > 9 ) begin`
157			`BH = BH - 10;`
158			`end`
159	165	gabrielosh	`{C_in,alu_result_expected[3:0]} = AL + BL + alu_status_expected[C];`
160			`{alu_status_expected[C],alu_result_expected[7:4]} = AH + BH + C_in;`
161			`if ( alu_result_expected[3:0] > 9 ) begin`
162			`alu_result_expected[3:0] = alu_result_expected[3:0] - 10;`
163			`alu_result_expected[7:4] = alu_result_expected[7:4] + 1;`
164	164	gabrielosh	`end`
165	165	gabrielosh	`if ( alu_result_expected[7:4] > 9 ) begin`
166			`alu_result_expected[7:4] = alu_result_expected[7:4] - 10;`
167			`alu_status_expected[C] = 1;`
168	164	gabrielosh	`end`
169	161	gabrielosh	`alu_status_expected[Z] = (alu_result_expected == 0) ? 1 : 0;`
170			`alu_status_expected[N] = alu_result_expected[7];`
171			`alu_status_expected[V] = ((alu_a[7] == sign) && (alu_a[7] != alu_result_expected[7]));`
172	173	gabrielosh	`check;`
173	179	gabrielosh	`end`
174			`$stop`
175			`// CLD`
176			`alu_opcode = CLD_IMP;`
177			`@(negedge clk);`
178			`alu_status_expected[D] = 0;`
179			`check;`
180
181	148	gabrielosh	`// ASL`
182	145	gabrielosh	`alu_opcode = ASL_ABS;`
183			`for (i = 0; i < 1000; i = i + 1)`
184			`begin`
185			`alu_a = i;`
186			`@(negedge clk);`
187			`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
188			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
189			`//$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);`
190			`{alu_status_expected[C], alu_result_expected} = {alu_a,1'b0};`
191			`alu_status_expected[Z] = (alu_result_expected == 0) ? 1 : 0;`
192			`alu_status_expected[N] = alu_result_expected[7];`
193	173	gabrielosh	`check;`
194	145	gabrielosh	`end`
195
196			`// LDA`
197	156	gabrielosh	`alu_a = 137;`
198			`alu_opcode = LDA_IMM;`
199			`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
200			`//$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);`
201			`@(negedge clk);`
202			`alu_result_expected = 8'd137;`
203			`// NV1BDIZC`
204			`alu_status_expected[Z] = (alu_result_expected == 0) ? 1 : 0;`
205			`alu_status_expected[N] = alu_result_expected[7];`
206	173	gabrielosh	`check;`
207	156	gabrielosh
208			`// EOR`
209			`alu_opcode = EOR_IMM;`
210			`for (i = 0; i < 1000; i = i + 1)`
211			`begin`
212			`alu_a = i;`
213			`@(negedge clk);`
214			`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
215			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
216			`//$display("op1 = %d op2 = %d c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);`
217	179	gabrielosh	`//$display("result_expected = %d",alu_result_expected);`
218	156	gabrielosh	`alu_result_expected = alu_a ^ alu_result_expected;`
219			`alu_status_expected[Z] = (alu_result_expected == 0) ? 1 : 0;`
220			`alu_status_expected[N] = alu_result_expected[7];`
221	179	gabrielosh	`//$display("result_expected = %d", alu_result_expected);`
222	173	gabrielosh	`check;`
223	156	gabrielosh	`end`
224
225			`// LDA`
226	145	gabrielosh	`alu_a = 0;`
227			`alu_opcode = LDA_IMM;`
228			`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
229			`//$display("op1 = %d op2 = %d c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);`
230			`@(negedge clk);`
231			`alu_result_expected = 8'h00;`
232			`// NV1BDIZC`
233			`alu_status_expected[Z] = (alu_result_expected == 0) ? 1 : 0;`
234			`alu_status_expected[N] = alu_result_expected[7];`
235	173	gabrielosh	`check;`
236	145	gabrielosh
237	127	gabrielosh	`// SBC`
238			`alu_opcode = SBC_IMM;`
239			`for (i = 0; i < 1000; i = i + 1)`
240			`begin`
241	145	gabrielosh	`alu_a = 1;`
242	140	gabrielosh	`@(negedge clk);`
243	174	gabrielosh	`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
244			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
245			`//$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);`
246	156	gabrielosh	`sign = alu_result_expected[7];`
247	174	gabrielosh	`alu_result_expected = alu_result_expected - alu_a - ( 1 - alu_status_expected[C]);`
248			`alu_status_expected[C] = ~alu_result_expected[7];`
249	127	gabrielosh	`alu_status_expected[Z] = (alu_result_expected == 0) ? 1 : 0;`
250			`alu_status_expected[N] = alu_result_expected[7];`
251	174	gabrielosh	`//$display("alu_a[7] = %b == sign = %b && alu_a[7] = %b != alu_result_expected[7] = %b", alu_a[7], sign, alu_a[7], alu_result_expected[7]);`
252	156	gabrielosh	`alu_status_expected[V] = ((alu_a[7] == sign) && (alu_a[7] != alu_result_expected[7]));`
253	173	gabrielosh	`check;`
254	127	gabrielosh	`end`
255
256			`// LDA`
257			`alu_opcode = LDA_IMM;`
258			`for (i = 0; i < 1000; i = i + 1)`
259			`begin`
260			`alu_a = i;`
261	140	gabrielosh	`@(negedge clk);`
262	127	gabrielosh	`alu_result_expected = i;`
263			`alu_status_expected[Z] = (alu_result_expected == 0) ? 1 : 0;`
264			`alu_status_expected[N] = alu_result_expected[7];`
265			`//$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	173	gabrielosh	`check;`
269	127	gabrielosh	`end`
270
271			`// LDX`
272			`alu_opcode = LDX_IMM;`
273			`for (i = 0; i < 1000; i = i + 1)`
274			`begin`
275			`alu_a = i;`
276	140	gabrielosh	`@(negedge clk);`
277	178	gabrielosh	`alu_x_expected = alu_a;`
278	179	gabrielosh	`//$display("alu_x_expected = %h", alu_x_expected);`
279	127	gabrielosh	`//alu_result_expected = i;`
280			`alu_status_expected[Z] = (alu_x_expected == 0) ? 1 : 0;`
281			`alu_status_expected[N] = alu_x_expected[7];`
282			`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
283			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
284			`//$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);`
285	173	gabrielosh	`check;`
286	127	gabrielosh	`end`
287
288			`// LDY`
289			`alu_opcode = LDY_IMM;`
290			`for (i = 0; i < 1001; i = i + 1)`
291			`begin`
292			`alu_a = i;`
293	140	gabrielosh	`@(negedge clk);`
294	178	gabrielosh	`alu_y_expected = alu_a;`
295	179	gabrielosh	`//$display("alu_y_expected = %h", alu_y_expected);`
296	127	gabrielosh	`//alu_result_expected = i;`
297			`alu_status_expected[Z] = (alu_y_expected == 0) ? 1 : 0;`
298			`alu_status_expected[N] = alu_y_expected[7];`
299			`//$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	173	gabrielosh	`check;`
303	127	gabrielosh	`end`
304
305			`// STA`
306			`alu_opcode = STA_ABS;`
307			`for (i = 0; i < 1000; i = i + 1)`
308			`begin`
309			`alu_a = i;`
310	140	gabrielosh	`@(negedge clk);`
311	127	gabrielosh	`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
312			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
313			`//$display("op1 = %d op2 = %d c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);`
314	178	gabrielosh	`//alu_result_expected = alu_a;`
315			`//alu_result_expected = DUT.A;`
316	173	gabrielosh	`check;`
317	127	gabrielosh	`end`
318
319			`// STX`
320			`alu_opcode = STX_ABS;`
321			`for (i = 0; i < 1000; i = i + 1)`
322			`begin`
323			`alu_a = i;`
324	140	gabrielosh	`@(negedge clk);`
325	179	gabrielosh	`//$display("alu_x_expected = %h", alu_x_expected);`
326	127	gabrielosh	`//alu_result_expected = i;`
327	178	gabrielosh	`//alu_x_expected = alu_a;`
328	127	gabrielosh	`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
329			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
330			`//$display("op1 = %d op2 = %d c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);`
331	173	gabrielosh	`check;`
332	127	gabrielosh	`end`
333
334			`// STY`
335			`alu_opcode = STY_ABS;`
336			`for (i = 0; i < 1000; i = i + 1)`
337			`begin`
338			`alu_a = i;`
339	140	gabrielosh	`@(negedge clk);`
340	179	gabrielosh	`//$display("alu_y_expected = %h", alu_y_expected);`
341	127	gabrielosh	`//alu_result_expected = i;`
342	178	gabrielosh	`//alu_y_expected = alu_a;`
343	127	gabrielosh	`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
344			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
345			`//$display("op1 = %d op2 = %d c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);`
346	173	gabrielosh	`check;`
347	127	gabrielosh	`end`
348
349			`// CMP`
350			`alu_opcode = CMP_IMM;`
351			`for (i = 0; i < 1000; i = i + 1)`
352			`begin`
353			`alu_a = i;`
354	140	gabrielosh	`@(negedge clk);`
355	127	gabrielosh	`temp = alu_result_expected - alu_a;`
356			`alu_status_expected[Z] = (temp == 0) ? 1 : 0;`
357			`alu_status_expected[N] = temp[7];`
358			`alu_status_expected[C] = (alu_result_expected >= alu_a) ? 1 : 0;`
359			`//alu_result_expected = i;`
360			`//alu_y_expected = i;`
361			`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
362			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
363			`//$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);`
364	173	gabrielosh	`check;`
365	127	gabrielosh	`end`
366
367			`// CPX`
368			`alu_opcode = CPX_IMM;`
369			`for (i = 0; i < 1000; i = i + 1)`
370			`begin`
371			`alu_a = i;`
372	140	gabrielosh	`@(negedge clk);`
373	127	gabrielosh	`temp = alu_x_expected - alu_a;`
374			`alu_status_expected[Z] = (temp == 0) ? 1 : 0;`
375			`alu_status_expected[N] = temp[7];`
376			`alu_status_expected[C] = (alu_x_expected >= alu_a) ? 1 : 0;`
377			`//alu_result_expected = i;`
378			`//alu_y_expected = i;`
379			`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
380			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
381			`//$display("op1 = %d op2 = %d c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);`
382	173	gabrielosh	`check;`
383	127	gabrielosh	`end`
384
385			`// CPY`
386			`alu_opcode = CPY_IMM;`
387			`for (i = 0; i < 1000; i = i + 1)`
388			`begin`
389			`alu_a = i;`
390	140	gabrielosh	`@(negedge clk);`
391	127	gabrielosh	`temp = alu_y_expected - alu_a;`
392			`alu_status_expected[Z] = (temp == 0) ? 1 : 0;`
393			`alu_status_expected[N] = temp[7];`
394			`alu_status_expected[C] = (alu_y_expected >= alu_a) ? 1 : 0;`
395			`//alu_result_expected = i;`
396			`//alu_y_expected = i;`
397			`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
398			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
399			`//$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);`
400	173	gabrielosh	`check;`
401	127	gabrielosh	`end`
402
403
404			`// AND`
405			`alu_opcode = AND_IMM;`
406			`for (i = 0; i < 1000; i = i + 1)`
407			`begin`
408			`alu_a = i;`
409	140	gabrielosh	`@(negedge clk);`
410	156	gabrielosh	`alu_result_expected = alu_a & alu_result_expected;`
411	127	gabrielosh	`alu_status_expected[Z] = (alu_result_expected == 0) ? 1 : 0;`
412			`alu_status_expected[N] = alu_result_expected[7];`
413			`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
414			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
415			`//$display("op1 = %d op2 = %d c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);`
416	173	gabrielosh	`check;`
417	127	gabrielosh	`end`
418
419			`// ASL`
420			`alu_opcode = ASL_ACC;`
421			`for (i = 0; i < 1000; i = i + 1)`
422			`begin`
423			`alu_a = i;`
424	140	gabrielosh	`@(negedge clk);`
425	127	gabrielosh	`alu_status_expected[C] = alu_result_expected[7];`
426			`alu_result_expected[7:0] = alu_result_expected << 1;`
427			`alu_status_expected[Z] = (alu_result_expected == 0) ? 1 : 0;`
428			`alu_status_expected[N] = alu_result_expected[7];`
429			`//$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	173	gabrielosh	`check;`
433	127	gabrielosh	`end`
434
435			`// INC`
436			`alu_opcode = INC_ZPG;`
437			`for (i = 0; i < 1000; i = i + 1)`
438			`begin`
439			`alu_a = i;`
440	140	gabrielosh	`@(negedge clk);`
441	127	gabrielosh	`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
442			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
443			`//$display("op1 = %d op2 = %d c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);`
444			`alu_result_expected = alu_a + 1;`
445			`alu_status_expected[Z] = (alu_result_expected == 0) ? 1 : 0;`
446			`alu_status_expected[N] = alu_result_expected[7];`
447	173	gabrielosh	`check;`
448	127	gabrielosh	`end`
449
450			`// INX`
451			`alu_opcode = INX_IMP;`
452			`for (i = 0; i < 1000; i = i + 1)`
453			`begin`
454			`alu_a = i;`
455	140	gabrielosh	`@(negedge clk);`
456	127	gabrielosh	`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
457			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
458			`//$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);`
459			`alu_x_expected = alu_x_expected + 1;`
460			`alu_status_expected[Z] = (alu_x_expected == 0) ? 1 : 0;`
461			`alu_status_expected[N] = alu_x_expected[7];`
462	173	gabrielosh	`check;`
463	127	gabrielosh	`end`
464
465			`// INY`
466			`alu_opcode = INY_IMP;`
467			`for (i = 0; i < 1000; i = i + 1)`
468			`begin`
469			`alu_a = i;`
470	140	gabrielosh	`@(negedge clk);`
471	127	gabrielosh	`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
472			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
473			`//$display("op1 = %d op2 = %d c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);`
474			`alu_y_expected = alu_y_expected + 1;`
475			`alu_status_expected[Z] = (alu_y_expected == 0) ? 1 : 0;`
476			`alu_status_expected[N] = alu_y_expected[7];`
477	173	gabrielosh	`check;`
478	127	gabrielosh	`end`
479
480			`// DEC`
481			`alu_opcode = DEC_ZPG;`
482			`for (i = 0; i < 1000; i = i + 1)`
483			`begin`
484			`alu_a = i;`
485	140	gabrielosh	`@(negedge clk);`
486	127	gabrielosh	`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
487			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
488			`//$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);`
489			`alu_result_expected = alu_a - 1;`
490			`alu_status_expected[Z] = (alu_result_expected == 0) ? 1 : 0;`
491			`alu_status_expected[N] = alu_result_expected[7];`
492	173	gabrielosh	`check;`
493	127	gabrielosh	`end`
494
495			`// DEX`
496			`alu_opcode = DEX_IMP;`
497			`for (i = 0; i < 1000; i = i + 1)`
498			`begin`
499			`alu_a = i;`
500	140	gabrielosh	`@(negedge clk);`

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