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[/] [t6507lp/] [trunk/] [rtl/] [verilog/] [t6507lp_alu_tb.v] - Diff between revs 179 and 181

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Rev 179 Rev 181
Line 18... Line 18... 
reg [7:0] alu_status_expected;
 
reg [7:0] alu_status_expected;
 
reg [7:0] alu_x_expected;
 
reg [7:0] alu_x_expected;
 
reg [7:0] alu_y_expected;
 
reg [7:0] alu_y_expected;
 
 
 
 
 
reg C_in;
 
reg C_in;
 
reg [7:0] temp;
 
reg C_temp;
 
 
 
reg [7:0] temp1;
 
 
 
reg [7:0] temp2;
 
reg sign;
 
reg sign;
 
reg [3:0] AL;
 
reg [3:0] AL;
 
reg [3:0] AH;
 
reg [3:0] AH;
 
reg [3:0] BL;
 
reg [3:0] BL;
 
reg [3:0] BH;
 
reg [3:0] BH;
Line 122... Line 124... 
        alu_status_expected[N] = 0;
 
        alu_status_expected[N] = 0;
 
        alu_status_expected[Z] = 1;
 
        alu_status_expected[Z] = 1;
 
        check;
 
        check;
 
        // SED
 
        // SED
 
        alu_opcode = SED_IMP;
 
        alu_opcode = SED_IMP;
 
 
 
        //$display("A = %h B = %h X = %h Y = %h", alu_result, alu_a, alu_x, alu_y);
 
        @(negedge clk);
 
        @(negedge clk);
 
        alu_status_expected[D] = 1;
 
        alu_status_expected[D] = 1;
 
        check;
 
        check;
 
 
 
 
 
        // ADC
 
        // ADC
 
        alu_opcode = ADC_IMM;
 
        alu_opcode = ADC_IMM;
 
        for (i = 0; i < 1000; i = i + 1)
 
        for (i = 0; i < 1000; i = i + 1)
 
        begin
 
        begin
 
                alu_a = $random;
 
                alu_a = $random;
 
 
 
                //$display("A = %h B = %h C = %b X = %h Y = %h", alu_result, alu_a, alu_status_expected[C], alu_x, alu_y);
 
                @(negedge clk);
 
                @(negedge clk);
 
                $display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);
 
                C_temp = 0;
 
                $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];
 
                sign = alu_result_expected[7];
 
                AL = alu_a[3:0];
 
                AL = alu_a[3:0];
 
                AH = alu_a[7:4];
 
                AH = alu_a[7:4];
 
                BL = alu_result_expected[3:0];
 
                BL = alu_result_expected[3:0];
 
                BH = alu_result_expected[7:4];
 
                BH = alu_result_expected[7:4];
 
                if ( AL > 9 ) begin
 
                /*
 
                        AL = AL - 10;
 
                if (AL > 9) begin
 
                        AH = AH + 1;
 
                        AL = AL - 10;
 
                end
 
                        AH = AH + 1;
 
                if (AH > 9) begin
 
                end
 
                        AH = AH - 10;
 
                if ( AH > 9 ) begin
 
                end
 
                        AH = AH - 10;
 
                if ( BL > 9 ) begin
 
                        C_temp = 1;
 
                        BL = BL - 10;
 
                end
 
                        BH = BH + 1;
 
                if (BL > 9) begin
 
                end
 
                        BL = BL - 10;
 
                if ( BH > 9 ) begin
 
                        BH = BH + 1;
 
                        BH = BH - 10;
 
                end
 
                end
 
                if ( BH > 9 ) begin
 
                {C_in,alu_result_expected[3:0]} = AL + BL + alu_status_expected[C];
 
                        BH = BH - 10;
 
                {alu_status_expected[C],alu_result_expected[7:4]} = AH + BH + C_in;
 
                        C_temp = 1;
 
                if ( alu_result_expected[3:0] > 9 ) begin
 
                end
 
                        alu_result_expected[3:0] = alu_result_expected[3:0] - 10;
 
                */
 
                        alu_result_expected[7:4] = alu_result_expected[7:4] + 1;
 
                //$display("AL = %h BL = %h", AL, BL, );
 
 
 
                temp1 = AL + BL + alu_status_expected[C];
 
 
 
                //AH = A[7:4] + alu_a[7:4];
 
 
 
                temp2 = AH + BH;
 
 
 
                //$display("temp1 = %h temp2 = %h", temp1, temp2);
 
 
 
                if (temp1 > 9) begin
 
 
 
                        temp2 = temp2 + (temp1 / 10);
 
 
 
                        temp1 = temp1 % 10;
 
                end
 
                end
 
                if ( alu_result_expected[7:4] > 9 ) begin
 
                if (temp2 > 9) begin
 
                        alu_result_expected[7:4] = alu_result_expected[7:4] - 10;
 
 
 
                        alu_status_expected[C] = 1;
 
                        alu_status_expected[C] = 1;
 
 
 
                        temp2 = temp2 % 10;
 
                end
 
                end
 
 
 
                else begin
 
 
 
                        alu_status_expected[C] = 0;
 
 
 
                end
 
 
 
                //$display("bcdh2 = %d", bcdh2);
 
 
 
                //$display("bcdl = %d", bcdl);
 
 
 
                alu_result_expected = {temp2[3:0],temp1[3:0]};
 
 
 
                //{C_in,alu_result_expected[3:0]} = AL + BL + alu_status_expected[C];
 
 
 
                //{alu_status_expected[C],alu_result_expected[7:4]} = AH + BH + C_in;
 
 
 
                //if ( alu_result_expected[3:0] > 9 ) begin
 
 
 
                //      alu_result_expected[3:0] = alu_result_expected[3:0] - 10;
 
 
 
        //              alu_result_expected[7:4] = alu_result_expected[7:4] + 1;
 
 
 
                //end
 
 
 
                //if ( alu_result_expected[7:4] > 9 ) begin
 
 
 
                //      alu_result_expected[7:4] = alu_result_expected[7:4] - 10;
 
 
 
        //              alu_status_expected[C] = 1;
 
 
 
                //end
 
 
 
                alu_status_expected[Z] = (alu_result_expected == 0) ? 1 : 0;
 
 
 
                alu_status_expected[N] = alu_result_expected[7];
 
 
 
                alu_status_expected[V] = ((alu_a[7] == sign) && (alu_a[7] != alu_result_expected[7]));
 
 
 
                check;
 
 
 
        end
 
 
 
        //$stop;
 
 
 
        // CLD
 
 
 
        alu_opcode = CLD_IMP;
 
 
 
        @(negedge clk);
 
 
 
        alu_status_expected[D] = 0;
 
 
 
        check;
 
 
 
 
 
 
 
        // SBC BCD
 
 
 
        // LDA
 
 
 
        alu_a = 0;
 
 
 
        alu_opcode = LDA_IMM;
 
 
 
        //$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);
 
 
 
        //$display("op1 = %d op2 = %d  c = %d d = %d n = %d v = %d result = %d", alu_a, DUT.A, alu_status[C], alu_status[D], alu_status[N], alu_status[V], alu_result);
 
 
 
        @(negedge clk);
 
 
 
        alu_result_expected = 8'h00;
 
 
 
        //                       NV1BDIZC
 
 
 
        alu_status_expected[N] = 0;
 
 
 
        alu_status_expected[Z] = 1;
 
 
 
        check;
 
 
 
        // SED
 
 
 
        alu_opcode = SED_IMP;
 
 
 
        $display("A = %h B = %h X = %h Y = %h", alu_result, alu_a, alu_x, alu_y);
 
 
 
        @(negedge clk);
 
 
 
        alu_status_expected[D] = 1;
 
 
 
        check;
 
 
 
 
 
 
 
        // ADC
 
 
 
        alu_opcode = SBC_IMM;
 
 
 
        for (i = 0; i < 1000; i = i + 1)
 
 
 
        begin
 
 
 
                alu_a = $random;
 
 
 
                $display("A = %h B = %h C = %b X = %h Y = %h", alu_result, alu_a, alu_status_expected[C], alu_x, alu_y);
 
 
 
                @(negedge clk);
 
 
 
                C_temp = 0;
 
 
 
                sign   = alu_a[7];
 
 
 
                AL     = alu_a[3:0];
 
 
 
                AH     = alu_a[7:4];
 
 
 
                BL     = ~alu_result_expected[3:0];
 
 
 
                BH     = ~alu_result_expected[7:4];
 
 
 
                /*
 
 
 
                if (AL > 9) begin
 
 
 
                        AL = AL - 10;
 
 
 
                        AH = AH + 1;
 
 
 
                end
 
 
 
                if ( AH > 9 ) begin
 
 
 
                        AH = AH - 10;
 
 
 
                        C_temp = 1;
 
 
 
                end
 
 
 
                if (BL > 9) begin
 
 
 
                        BL = BL - 10;
 
 
 
                        BH = BH + 1;
 
 
 
                end
 
 
 
                if ( BH > 9 ) begin
 
 
 
                        BH = BH - 10;
 
 
 
                        C_temp = 1;
 
 
 
                end
 
 
 
                */
 
 
 
 
 
 
 
                //$display("AL = %h BL = %h", AL, BL, );
 
 
 
                temp1 = AL + BL + alu_status_expected[C];
 
 
 
                //AH = A[7:4] + alu_a[7:4];
 
 
 
                temp2 = AH + BH;
 
 
 
                //$display("temp1 = %h temp2 = %h", temp1, temp2);
 
 
 
                if (temp1 > 9) begin
 
 
 
                        temp2 = temp2 + (temp1 / 10);
 
 
 
                        temp1 = temp1 % 10;
 
 
 
                end
 
 
 
                if (temp2 > 9) begin
 
 
 
                        alu_status_expected[C] = 1;
 
 
 
                        temp2 = temp2 % 10;
 
 
 
                end
 
 
 
                else begin
 
 
 
                        alu_status_expected[C] = 0;
 
 
 
                end
 
 
 
                //$display("bcdh2 = %d", bcdh2);
 
 
 
                //$display("bcdl = %d", bcdl);
 
 
 
                alu_result_expected = {temp2[3:0],temp1[3:0]};
 
 
 
                //{C_in,alu_result_expected[3:0]} = AL + BL + alu_status_expected[C];
 
 
 
                //{alu_status_expected[C],alu_result_expected[7:4]} = AH + BH + C_in;
 
 
 
                //if ( alu_result_expected[3:0] > 9 ) begin
 
 
 
                //      alu_result_expected[3:0] = alu_result_expected[3:0] - 10;
 
 
 
        //              alu_result_expected[7:4] = alu_result_expected[7:4] + 1;
 
 
 
                //end
 
 
 
                //if ( alu_result_expected[7:4] > 9 ) begin
 
 
 
                //      alu_result_expected[7:4] = alu_result_expected[7:4] - 10;
 
 
 
        //              alu_status_expected[C] = 1;
 
 
 
                //end
 
                alu_status_expected[Z] = (alu_result_expected == 0) ? 1 : 0;
 
                alu_status_expected[Z] = (alu_result_expected == 0) ? 1 : 0;
 
                alu_status_expected[N] = alu_result_expected[7];
 
                alu_status_expected[N] = alu_result_expected[7];
 
                alu_status_expected[V] = ((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;
 
                check;
 
        end
 
        end
 
        $stop
 
        $stop;
 
        // CLD
 
        // CLD
 
        alu_opcode = CLD_IMP;
 
        alu_opcode = CLD_IMP;
 
        @(negedge clk);
 
        @(negedge clk);
 
        alu_status_expected[D] = 0;
 
        alu_status_expected[D] = 0;
 
        check;
 
        check;
Line 350... Line 467... 
        alu_opcode = CMP_IMM;
 
        alu_opcode = CMP_IMM;
 
        for (i = 0; i < 1000; i = i + 1)
 
        for (i = 0; i < 1000; i = i + 1)
 
        begin
 
        begin
 
                alu_a = i;
 
                alu_a = i;
 
                @(negedge clk);
 
                @(negedge clk);
 
                temp = alu_result_expected - alu_a;
 
                temp1 = alu_result_expected - alu_a;
 
                alu_status_expected[Z] = (temp == 0) ? 1 : 0;
 
                alu_status_expected[Z] = (temp1 == 0) ? 1 : 0;
 
                alu_status_expected[N] = temp[7];
 
                alu_status_expected[N] = temp1[7];
 
                alu_status_expected[C] = (alu_result_expected >= alu_a) ? 1 : 0;
 
                alu_status_expected[C] = (alu_result_expected >= alu_a) ? 1 : 0;
 
                //alu_result_expected = i;
 
                //alu_result_expected = i;
 
                //alu_y_expected = i;
 
                //alu_y_expected = i;
 
                //$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);
 
                //$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("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);
Line 368... Line 485... 
        alu_opcode = CPX_IMM;
 
        alu_opcode = CPX_IMM;
 
        for (i = 0; i < 1000; i = i + 1)
 
        for (i = 0; i < 1000; i = i + 1)
 
        begin
 
        begin
 
                alu_a = i;
 
                alu_a = i;
 
                @(negedge clk);
 
                @(negedge clk);
 
                temp = alu_x_expected - alu_a;
 
                temp1 = alu_x_expected - alu_a;
 
                alu_status_expected[Z] = (temp == 0) ? 1 : 0;
 
                alu_status_expected[Z] = (temp1 == 0) ? 1 : 0;
 
                alu_status_expected[N] = temp[7];
 
                alu_status_expected[N] = temp1[7];
 
                alu_status_expected[C] = (alu_x_expected >= alu_a) ? 1 : 0;
 
                alu_status_expected[C] = (alu_x_expected >= alu_a) ? 1 : 0;
 
                //alu_result_expected = i;
 
                //alu_result_expected = i;
 
                //alu_y_expected = i;
 
                //alu_y_expected = i;
 
                //$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);
 
                //$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("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);
Line 386... Line 503... 
        alu_opcode = CPY_IMM;
 
        alu_opcode = CPY_IMM;
 
        for (i = 0; i < 1000; i = i + 1)
 
        for (i = 0; i < 1000; i = i + 1)
 
        begin
 
        begin
 
                alu_a = i;
 
                alu_a = i;
 
                @(negedge clk);
 
                @(negedge clk);
 
                temp = alu_y_expected - alu_a;
 
                temp1 = alu_y_expected - alu_a;
 
                alu_status_expected[Z] = (temp == 0) ? 1 : 0;
 
                alu_status_expected[Z] = (temp1 == 0) ? 1 : 0;
 
                alu_status_expected[N] = temp[7];
 
                alu_status_expected[N] = temp1[7];
 
                alu_status_expected[C] = (alu_y_expected >= alu_a) ? 1 : 0;
 
                alu_status_expected[C] = (alu_y_expected >= alu_a) ? 1 : 0;
 
                //alu_result_expected = i;
 
                //alu_result_expected = i;
 
                //alu_y_expected = i;
 
                //alu_y_expected = i;
 
                //$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);
 
                //$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("DUT.A = %h DUT.X = %h DUT.Y = %h", DUT.A, DUT.X, DUT.Y);
Line 592... Line 709... 
        @(negedge clk);
 
        @(negedge clk);
 
        //$display("i = %d alu_opcode = %h alu_enable = %d", i, alu_opcode, alu_enable);
 
        //$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("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("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 = DUT.A;
 
        alu_result_expected = alu_a;
 
        //alu_result_expected = alu_a;
 
        check;
 
        check;
 
 
 
 
 
        // PHP
 
        // PHP
 
        alu_opcode = PHP_IMP;
 
        alu_opcode = PHP_IMP;
 
        @(negedge clk);
 
        @(negedge clk);

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