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[/] [t6507lp/] [trunk/] [rtl/] [verilog/] [t6507lp_alu_tb.v] - Blame information for rev 168

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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
*/
 
        // 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_status_expected[C], alu_result_expected} = alu_result_expected - alu_a - ( 1 - 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
 
        // LDA
        alu_opcode = LDA_IMM;
        for (i = 0; i < 1000; i = i + 1)
        begin
                alu_a = i;
                @(negedge clk);
                alu_result_expected = i;
                alu_status_expected[Z] = (alu_result_expected == 0) ? 1 : 0;
                alu_status_expected[N] = alu_result_expected[7];
                //$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);
                //$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);
                //$display("op1 = %d op2 = %d  c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);
                check();
        end
 
        // LDX
        alu_opcode = LDX_IMM;
        for (i = 0; i < 1000; i = i + 1)
        begin
                alu_a = i;
                @(negedge clk);
                alu_x_expected = i;
                //alu_result_expected = i;
                alu_status_expected[Z] = (alu_x_expected == 0) ? 1 : 0;
                alu_status_expected[N] = alu_x_expected[7];
                //$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);
                //$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);
                //$display("op1 = %d op2 = %d  c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);
                check();
        end
 
        // LDY
        alu_opcode = LDY_IMM;
        for (i = 0; i < 1001; i = i + 1)
        begin
                alu_a = i;
                @(negedge clk);
                alu_y_expected = i;
                //alu_result_expected = i;
                alu_status_expected[Z] = (alu_y_expected == 0) ? 1 : 0;
                alu_status_expected[N] = alu_y_expected[7];
                //$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);
                //$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);
                //$display("op1 = %d op2 = %d  c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);
                check();
        end
 
        // STA
        alu_opcode = STA_ABS;
        for (i = 0; i < 1000; i = i + 1)
        begin
                alu_a = i;
                @(negedge clk);
                //$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);
                //$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);
                //$display("op1 = %d op2 = %d  c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);
                check();
        end
 
        // STX
        alu_opcode = STX_ABS;
        for (i = 0; i < 1000; i = i + 1)
        begin
                alu_a = i;
                @(negedge clk);
                //alu_result_expected = i;
                //alu_x_expected = i;
                //$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);
                //$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);
                //$display("op1 = %d op2 = %d  c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);
                check();
        end
 
        // STY
        alu_opcode = STY_ABS;
        for (i = 0; i < 1000; i = i + 1)
        begin
                alu_a = i;
                @(negedge clk);
                //alu_result_expected = i;
                //alu_y_expected = i;
                //$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);
                //$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);
                //$display("op1 = %d op2 = %d  c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);
                check();
        end
 
        // CMP
        alu_opcode = CMP_IMM;
        for (i = 0; i < 1000; i = i + 1)
        begin
                alu_a = i;
                @(negedge clk);
                temp = alu_result_expected - alu_a;
                alu_status_expected[Z] = (temp == 0) ? 1 : 0;
                alu_status_expected[N] = temp[7];
                alu_status_expected[C] = (alu_result_expected >= alu_a) ? 1 : 0;
                //alu_result_expected = i;
                //alu_y_expected = i;
                //$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);
                //$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);
                //$display("op1 = %d op2 = %d  c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);
                check();
        end
 
        // CPX
        alu_opcode = CPX_IMM;
        for (i = 0; i < 1000; i = i + 1)
        begin
                alu_a = i;
                @(negedge clk);
                temp = alu_x_expected - alu_a;
                alu_status_expected[Z] = (temp == 0) ? 1 : 0;
                alu_status_expected[N] = temp[7];
                alu_status_expected[C] = (alu_x_expected >= alu_a) ? 1 : 0;
                //alu_result_expected = i;
                //alu_y_expected = i;
                //$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);
                //$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);
                //$display("op1 = %d op2 = %d  c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);
                check();
        end
 
        // CPY
        alu_opcode = CPY_IMM;
        for (i = 0; i < 1000; i = i + 1)
        begin
                alu_a = i;
                @(negedge clk);
                temp = alu_y_expected - alu_a;
                alu_status_expected[Z] = (temp == 0) ? 1 : 0;
                alu_status_expected[N] = temp[7];
                alu_status_expected[C] = (alu_y_expected >= alu_a) ? 1 : 0;
                //alu_result_expected = i;
                //alu_y_expected = i;
                //$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);
                //$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);
                //$display("op1 = %d op2 = %d  c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);
                check();
        end
 
 
        // AND
        alu_opcode = AND_IMM;
        for (i = 0; i < 1000; i = i + 1)
        begin
                alu_a = i;
                @(negedge clk);
                alu_result_expected = 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
 
        // 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;
        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	127	gabrielosh	`check();`
94
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	127	gabrielosh	`check();`
111			`end`
112	165	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	161	gabrielosh	`check();`
125	164	gabrielosh	`// SED`
126			`alu_opcode = SED_IMP;`
127			`@(negedge clk);`
128			`alu_status_expected[D] = 1;`
129			`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			`check();`
173			`end`
174	165	gabrielosh	`*/`
175	161	gabrielosh
176	148	gabrielosh	`// ASL`
177	145	gabrielosh	`alu_opcode = ASL_ABS;`
178			`for (i = 0; i < 1000; i = i + 1)`
179			`begin`
180			`alu_a = i;`
181			`@(negedge clk);`
182			`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
183			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
184			`//$display("op1 = %d op2 = %d c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);`
185			`{alu_status_expected[C], alu_result_expected} = {alu_a,1'b0};`
186			`alu_status_expected[Z] = (alu_result_expected == 0) ? 1 : 0;`
187			`alu_status_expected[N] = alu_result_expected[7];`
188			`check();`
189			`end`
190
191			`// LDA`
192	156	gabrielosh	`alu_a = 137;`
193			`alu_opcode = LDA_IMM;`
194			`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
195			`//$display("op1 = %d op2 = %d c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);`
196			`@(negedge clk);`
197			`alu_result_expected = 8'd137;`
198			`// NV1BDIZC`
199			`alu_status_expected[Z] = (alu_result_expected == 0) ? 1 : 0;`
200			`alu_status_expected[N] = alu_result_expected[7];`
201			`check();`
202
203			`// EOR`
204			`alu_opcode = EOR_IMM;`
205			`for (i = 0; i < 1000; i = i + 1)`
206			`begin`
207			`alu_a = i;`
208			`@(negedge clk);`
209			`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
210			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
211			`//$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			`$display("result_expected = %d",alu_result_expected);`
213			`alu_result_expected = alu_a ^ alu_result_expected;`
214			`alu_status_expected[Z] = (alu_result_expected == 0) ? 1 : 0;`
215			`alu_status_expected[N] = alu_result_expected[7];`
216			`$display("result_expected = %d", alu_result_expected);`
217			`check();`
218			`end`
219
220			`// LDA`
221	145	gabrielosh	`alu_a = 0;`
222			`alu_opcode = LDA_IMM;`
223			`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
224			`//$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);`
225			`@(negedge clk);`
226			`alu_result_expected = 8'h00;`
227			`// NV1BDIZC`
228			`alu_status_expected[Z] = (alu_result_expected == 0) ? 1 : 0;`
229			`alu_status_expected[N] = alu_result_expected[7];`
230			`check();`
231
232	127	gabrielosh	`// SBC`
233			`alu_opcode = SBC_IMM;`
234			`for (i = 0; i < 1000; i = i + 1)`
235			`begin`
236	145	gabrielosh	`alu_a = 1;`
237	140	gabrielosh	`@(negedge clk);`
238	127	gabrielosh	`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
239			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
240			`//$display("op1 = %d op2 = %d c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);`
241	156	gabrielosh	`sign = alu_result_expected[7];`
242	165	gabrielosh	`{alu_status_expected[C], alu_result_expected} = alu_result_expected - alu_a - ( 1 - alu_status_expected[C]);`
243	127	gabrielosh	`alu_status_expected[Z] = (alu_result_expected == 0) ? 1 : 0;`
244			`alu_status_expected[N] = alu_result_expected[7];`
245	156	gabrielosh	`alu_status_expected[V] = ((alu_a[7] == sign) && (alu_a[7] != alu_result_expected[7]));`
246	127	gabrielosh	`check();`
247			`end`
248
249			`// LDA`
250			`alu_opcode = LDA_IMM;`
251			`for (i = 0; i < 1000; i = i + 1)`
252			`begin`
253			`alu_a = i;`
254	140	gabrielosh	`@(negedge clk);`
255	127	gabrielosh	`alu_result_expected = i;`
256			`alu_status_expected[Z] = (alu_result_expected == 0) ? 1 : 0;`
257			`alu_status_expected[N] = alu_result_expected[7];`
258			`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
259			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
260			`//$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);`
261			`check();`
262			`end`
263
264			`// LDX`
265			`alu_opcode = LDX_IMM;`
266			`for (i = 0; i < 1000; i = i + 1)`
267			`begin`
268			`alu_a = i;`
269	140	gabrielosh	`@(negedge clk);`
270	127	gabrielosh	`alu_x_expected = i;`
271			`//alu_result_expected = i;`
272			`alu_status_expected[Z] = (alu_x_expected == 0) ? 1 : 0;`
273			`alu_status_expected[N] = alu_x_expected[7];`
274			`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
275			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
276			`//$display("op1 = %d op2 = %d c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);`
277			`check();`
278			`end`
279
280			`// LDY`
281			`alu_opcode = LDY_IMM;`
282			`for (i = 0; i < 1001; i = i + 1)`
283			`begin`
284			`alu_a = i;`
285	140	gabrielosh	`@(negedge clk);`
286	127	gabrielosh	`alu_y_expected = i;`
287			`//alu_result_expected = i;`
288			`alu_status_expected[Z] = (alu_y_expected == 0) ? 1 : 0;`
289			`alu_status_expected[N] = alu_y_expected[7];`
290			`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
291			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
292			`//$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);`
293			`check();`
294			`end`
295
296			`// STA`
297			`alu_opcode = STA_ABS;`
298			`for (i = 0; i < 1000; i = i + 1)`
299			`begin`
300			`alu_a = i;`
301	140	gabrielosh	`@(negedge clk);`
302	127	gabrielosh	`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
303			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
304			`//$display("op1 = %d op2 = %d c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);`
305			`check();`
306			`end`
307
308			`// STX`
309			`alu_opcode = STX_ABS;`
310			`for (i = 0; i < 1000; i = i + 1)`
311			`begin`
312			`alu_a = i;`
313	140	gabrielosh	`@(negedge clk);`
314	127	gabrielosh	`//alu_result_expected = i;`
315			`//alu_x_expected = i;`
316			`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
317			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
318			`//$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);`
319			`check();`
320			`end`
321
322			`// STY`
323			`alu_opcode = STY_ABS;`
324			`for (i = 0; i < 1000; i = i + 1)`
325			`begin`
326			`alu_a = i;`
327	140	gabrielosh	`@(negedge clk);`
328	127	gabrielosh	`//alu_result_expected = i;`
329			`//alu_y_expected = i;`
330			`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
331			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
332			`//$display("op1 = %d op2 = %d c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);`
333			`check();`
334			`end`
335
336			`// CMP`
337			`alu_opcode = CMP_IMM;`
338			`for (i = 0; i < 1000; i = i + 1)`
339			`begin`
340			`alu_a = i;`
341	140	gabrielosh	`@(negedge clk);`
342	127	gabrielosh	`temp = alu_result_expected - alu_a;`
343			`alu_status_expected[Z] = (temp == 0) ? 1 : 0;`
344			`alu_status_expected[N] = temp[7];`
345			`alu_status_expected[C] = (alu_result_expected >= alu_a) ? 1 : 0;`
346			`//alu_result_expected = i;`
347			`//alu_y_expected = i;`
348			`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
349			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
350			`//$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);`
351			`check();`
352			`end`
353
354			`// CPX`
355			`alu_opcode = CPX_IMM;`
356			`for (i = 0; i < 1000; i = i + 1)`
357			`begin`
358			`alu_a = i;`
359	140	gabrielosh	`@(negedge clk);`
360	127	gabrielosh	`temp = alu_x_expected - alu_a;`
361			`alu_status_expected[Z] = (temp == 0) ? 1 : 0;`
362			`alu_status_expected[N] = temp[7];`
363			`alu_status_expected[C] = (alu_x_expected >= alu_a) ? 1 : 0;`
364			`//alu_result_expected = i;`
365			`//alu_y_expected = i;`
366			`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
367			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
368			`//$display("op1 = %d op2 = %d c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);`
369			`check();`
370			`end`
371
372			`// CPY`
373			`alu_opcode = CPY_IMM;`
374			`for (i = 0; i < 1000; i = i + 1)`
375			`begin`
376			`alu_a = i;`
377	140	gabrielosh	`@(negedge clk);`
378	127	gabrielosh	`temp = alu_y_expected - alu_a;`
379			`alu_status_expected[Z] = (temp == 0) ? 1 : 0;`
380			`alu_status_expected[N] = temp[7];`
381			`alu_status_expected[C] = (alu_y_expected >= alu_a) ? 1 : 0;`
382			`//alu_result_expected = i;`
383			`//alu_y_expected = i;`
384			`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
385			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
386			`//$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);`
387			`check();`
388			`end`
389
390
391			`// AND`
392			`alu_opcode = AND_IMM;`
393			`for (i = 0; i < 1000; i = i + 1)`
394			`begin`
395			`alu_a = i;`
396	140	gabrielosh	`@(negedge clk);`
397	156	gabrielosh	`alu_result_expected = alu_a & alu_result_expected;`
398	127	gabrielosh	`alu_status_expected[Z] = (alu_result_expected == 0) ? 1 : 0;`
399			`alu_status_expected[N] = alu_result_expected[7];`
400			`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
401			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
402			`//$display("op1 = %d op2 = %d c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);`
403			`check();`
404			`end`
405
406			`// ASL`
407			`alu_opcode = ASL_ACC;`
408			`for (i = 0; i < 1000; i = i + 1)`
409			`begin`
410			`alu_a = i;`
411	140	gabrielosh	`@(negedge clk);`
412	127	gabrielosh	`alu_status_expected[C] = alu_result_expected[7];`
413			`alu_result_expected[7:0] = alu_result_expected << 1;`
414			`alu_status_expected[Z] = (alu_result_expected == 0) ? 1 : 0;`
415			`alu_status_expected[N] = alu_result_expected[7];`
416			`//$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			`check();`
420			`end`
421
422			`// INC`
423			`alu_opcode = INC_ZPG;`
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			`//$display("op1 = %d op2 = %d c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);`
431			`alu_result_expected = alu_a + 1;`
432			`alu_status_expected[Z] = (alu_result_expected == 0) ? 1 : 0;`
433			`alu_status_expected[N] = alu_result_expected[7];`
434			`check();`
435			`end`
436
437			`// INX`
438			`alu_opcode = INX_IMP;`
439			`for (i = 0; i < 1000; i = i + 1)`
440			`begin`
441			`alu_a = i;`
442	140	gabrielosh	`@(negedge clk);`
443	127	gabrielosh	`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
444			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
445			`//$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);`
446			`alu_x_expected = alu_x_expected + 1;`
447			`alu_status_expected[Z] = (alu_x_expected == 0) ? 1 : 0;`
448			`alu_status_expected[N] = alu_x_expected[7];`
449			`check();`
450			`end`
451
452			`// INY`
453			`alu_opcode = INY_IMP;`
454			`for (i = 0; i < 1000; i = i + 1)`
455			`begin`
456			`alu_a = i;`
457	140	gabrielosh	`@(negedge clk);`
458	127	gabrielosh	`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
459			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
460			`//$display("op1 = %d op2 = %d c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);`
461			`alu_y_expected = alu_y_expected + 1;`
462			`alu_status_expected[Z] = (alu_y_expected == 0) ? 1 : 0;`
463			`alu_status_expected[N] = alu_y_expected[7];`
464			`check();`
465			`end`
466
467			`// DEC`
468			`alu_opcode = DEC_ZPG;`
469			`for (i = 0; i < 1000; i = i + 1)`
470			`begin`
471			`alu_a = i;`
472	140	gabrielosh	`@(negedge clk);`
473	127	gabrielosh	`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
474			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
475			`//$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);`
476			`alu_result_expected = alu_a - 1;`
477			`alu_status_expected[Z] = (alu_result_expected == 0) ? 1 : 0;`
478			`alu_status_expected[N] = alu_result_expected[7];`
479			`check();`
480			`end`
481
482			`// DEX`
483			`alu_opcode = DEX_IMP;`
484			`for (i = 0; i < 1000; i = i + 1)`
485			`begin`
486			`alu_a = i;`
487	140	gabrielosh	`@(negedge clk);`
488	127	gabrielosh	`//$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);`
489			`//$display("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);`
490			`//$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);`
491			`alu_x_expected = alu_x_expected - 1;`
492			`alu_status_expected[Z] = (alu_x_expected == 0) ? 1 : 0;`
493			`alu_status_expected[N] = alu_x_expected[7];`
494			`check();`
495			`end`
496
497			`// DEY`
498			`alu_opcode = DEY_IMP;`
499			`for (i = 0; i < 1000; i = i + 1)`
500			`begin`

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