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[/] [rtl/] [bench/] [tb_branch_unit.v] - Blame information for rev 11

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//////////////////////////////////////////////////////////////////////////////////
// Engineer: Rafael de Oliveira Calçada (rafaelcalcada@gmail.com)
// 
// Create Date: 26.04.2020 18:45:28
// Module Name: tb_branch_unit
// Project Name: Steel Core
// Description: Branch decision unit testbench
// 
// Dependencies: globals.vh
//               branch_unit.v
// 
// Version 0.01
// 
//////////////////////////////////////////////////////////////////////////////////
 
/*********************************************************************************
 
MIT License
 
Copyright (c) 2020 Rafael de Oliveira Calçada
 
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
 
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
 
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
 
********************************************************************************/
 
`timescale 1ns / 1ps
`include "../globals.vh"
 
module tb_branch_unit();
 
    reg [6:2] OPCODE_6_TO_2;
    reg [31:0] RS1;
    reg [31:0] RS2;
    reg [2:0] FUNCT3;
        wire BRANCH_TAKEN;
 
        integer i = 0;
        reg signed [31:0] rs1s;
        reg signed [31:0] rs2s;
 
    branch_unit dut(
        .OPCODE_6_TO_2(OPCODE_6_TO_2),
        .RS1(RS1),
        .RS2(RS2),
        .FUNCT3(FUNCT3),
        .BRANCH_TAKEN(BRANCH_TAKEN)
    );
 
    initial
    begin
 
        $display("Testing Branch Unit...");
 
        $display("Testing branch comparator unit for BEQ.");
 
        FUNCT3 = 3'b000;
        OPCODE_6_TO_2 = `OPCODE_BRANCH;
 
        for(i = 0; i < 10000; i=i+1)
        begin
            RS1 = $random;
            RS2 = $random;
 
            #10;
 
            if(RS1 == RS2 && BRANCH_TAKEN != 1'b1)
            begin
                $display("FAIL. Expected BRANCH_TAKEN = 1.");
                $finish;
            end
            if(RS1 != RS2 && BRANCH_TAKEN != 1'b0)
            begin
                $display("FAIL. Expected BRANCH_TAKEN = 0.");
                $finish;
            end
        end
 
        RS1 = $random;
        RS2 = RS1;
        #10;
        if(BRANCH_TAKEN != 1'b1)
        begin
            $display("FAIL. Expected BRANCH_TAKEN = 1.");
            $finish;
        end
 
        $display("Branch comparator works fine for BEQ.");
 
        $display("Testing branch comparator unit for BNE.");
 
        FUNCT3 = 3'b001;
        OPCODE_6_TO_2 = `OPCODE_BRANCH;
 
        for(i = 0; i < 10000; i=i+1)
        begin
            RS1 = $random;
            RS2 = $random;
 
            #10;
 
            if(RS1 != RS2 && BRANCH_TAKEN != 1'b1)
            begin
                $display("FAIL. Expected BRANCH_TAKEN = 1.");
                $finish;
            end
            if(RS1 == RS2 && BRANCH_TAKEN != 1'b0)
            begin
                $display("FAIL. Expected BRANCH_TAKEN = 0.");
                $finish;
            end
        end
 
        RS1 = $random;
        RS2 = RS1;
        #10;
        if(BRANCH_TAKEN != 1'b0)
        begin
            $display("FAIL. Expected BRANCH_TAKEN = 0.");
            $finish;
        end
 
        $display("Branch comparator works fine for BNE.");
 
        $display("Testing branch comparator unit for BLT.");
 
        FUNCT3 = 3'b100;
        OPCODE_6_TO_2 = `OPCODE_BRANCH;
 
        for(i = 0; i < 10000; i=i+1)
        begin
            RS1 = $random;
            RS2 = $random;
            rs1s = RS1;
            rs2s = RS2;
            #10;
 
            if(rs1s < rs2s && BRANCH_TAKEN != 1'b1)
            begin
                $display("FAIL. Expected BRANCH_TAKEN = 1.");
                $finish;
            end
            if(rs1s >= rs2s && BRANCH_TAKEN != 1'b0)
            begin
                $display("FAIL. Expected BRANCH_TAKEN = 0.");
                $finish;
            end
        end
 
        RS1 = 32'b11111111_11111111_11111111_11111000;
        RS2 = 32'b11111111_11111111_11111111_11111100;
        #10;
        if(BRANCH_TAKEN != 1'b1)
        begin
            $display("FAIL. Expected BRANCH_TAKEN = 1.");
            $finish;
        end
 
        RS1 = 32'b11111111_11111111_11111111_11111100;
        RS2 = 32'b11111111_11111111_11111111_11111000;
        #10;
        if(BRANCH_TAKEN != 1'b0)
        begin
            $display("FAIL. Expected BRANCH_TAKEN = 0.");
            $finish;
        end
 
        RS1 = 32'b00000000_00000000_00000000_00001000;
        RS2 = 32'b00000000_00000000_00000000_00001100;
        #10;
        if(BRANCH_TAKEN != 1'b1)
        begin
            $display("FAIL. Expected BRANCH_TAKEN = 1.");
            $finish;
        end
 
        RS1 = 32'b00000000_00000000_00000000_00001100;
        RS2 = 32'b00000000_00000000_00000000_00001000;
        #10;
        if(BRANCH_TAKEN != 1'b0)
        begin
            $display("FAIL. Expected BRANCH_TAKEN = 0.");
            $finish;
        end
 
        RS1 = 32'b11111111_11111111_11111111_11111000;
        RS2 = 32'b00000000_00000000_00000000_00001100;
        #10;
        if(BRANCH_TAKEN != 1'b1)
        begin
            $display("FAIL. Expected BRANCH_TAKEN = 1.");
            $finish;
        end
 
        RS1 = 32'b00000000_00000000_00000000_00001100;
        RS2 = 32'b11111111_11111111_11111111_11111000;
        #10;
        if(BRANCH_TAKEN != 1'b0)
        begin
            $display("FAIL. Expected BRANCH_TAKEN = 0.");
            $finish;
        end
 
        $display("Branch comparator works fine for BLT.");
 
        $display("Testing branch comparator unit for BGE.");
 
        FUNCT3 = 3'b101;
        OPCODE_6_TO_2 = `OPCODE_BRANCH;
 
        for(i = 0; i < 10000; i=i+1)
        begin
            RS1 = $random;
            RS2 = $random;
            rs1s = RS1;
            rs2s = RS2;
            #10;
 
            if(rs1s >= rs2s && BRANCH_TAKEN != 1'b1)
            begin
                $display("FAIL. Expected BRANCH_TAKEN = 1.");
                $finish;
            end
            if(rs1s < rs2s && BRANCH_TAKEN != 1'b0)
            begin
                $display("FAIL. Expected BRANCH_TAKEN = 0.");
                $finish;
            end
        end
 
        RS1 = 32'b11111111_11111111_11111111_11111000;
        RS2 = 32'b11111111_11111111_11111111_11111100;
        #10;
        if(BRANCH_TAKEN != 1'b0)
        begin
            $display("FAIL. Expected BRANCH_TAKEN = 0.");
            $finish;
        end
 
        RS1 = 32'b11111111_11111111_11111111_11111100;
        RS2 = 32'b11111111_11111111_11111111_11111000;
        #10;
        if(BRANCH_TAKEN != 1'b1)
        begin
            $display("FAIL. Expected BRANCH_TAKEN = 1.");
            $finish;
        end
 
        RS1 = 32'b00000000_00000000_00000000_00001000;
        RS2 = 32'b00000000_00000000_00000000_00001100;
        #10;
        if(BRANCH_TAKEN != 1'b0)
        begin
            $display("FAIL. Expected BRANCH_TAKEN = 0.");
            $finish;
        end
 
        RS1 = 32'b00000000_00000000_00000000_00001100;
        RS2 = 32'b00000000_00000000_00000000_00001000;
        #10;
        if(BRANCH_TAKEN != 1'b1)
        begin
            $display("FAIL. Expected BRANCH_TAKEN = 1.");
            $finish;
        end
 
        RS1 = 32'b11111111_11111111_11111111_11111000;
        RS2 = 32'b00000000_00000000_00000000_00001100;
        #10;
        if(BRANCH_TAKEN != 1'b0)
        begin
            $display("FAIL. Expected BRANCH_TAKEN = 0.");
            $finish;
        end
 
        RS1 = 32'b00000000_00000000_00000000_00001100;
        RS2 = 32'b11111111_11111111_11111111_11111000;
        #10;
        if(BRANCH_TAKEN != 1'b1)
        begin
            $display("FAIL. Expected BRANCH_TAKEN = 1.");
            $finish;
        end
 
        $display("Branch comparator works fine for BGE.");
 
        $display("Testing branch comparator unit for BLTU.");
 
        FUNCT3 = 3'b110;
        OPCODE_6_TO_2 = `OPCODE_BRANCH;
 
        for(i = 0; i < 10000; i=i+1)
        begin
            RS1 = $random;
            RS2 = $random;
 
            #10;
 
            if(RS1 < RS2 && BRANCH_TAKEN != 1'b1)
            begin
                $display("FAIL. Expected BRANCH_TAKEN = 1.");
                $finish;
            end
            if(RS1 >= RS2 && BRANCH_TAKEN != 1'b0)
            begin
                $display("FAIL. Expected BRANCH_TAKEN = 0.");
                $finish;
            end
        end
 
        RS1 = 32'b11111111_11111111_11111111_11111000;
        RS2 = 32'b11111111_11111111_11111111_11111100;
        #10;
        if(BRANCH_TAKEN != 1'b1)
        begin
            $display("FAIL. Expected BRANCH_TAKEN = 1.");
            $finish;
        end
 
        RS1 = 32'b11111111_11111111_11111111_11111100;
        RS2 = 32'b11111111_11111111_11111111_11111000;
        #10;
        if(BRANCH_TAKEN != 1'b0)
        begin
            $display("FAIL. Expected BRANCH_TAKEN = 0.");
            $finish;
        end
 
        RS1 = 32'b00000000_00000000_00000000_00001000;
        RS2 = 32'b00000000_00000000_00000000_00001100;
        #10;
        if(BRANCH_TAKEN != 1'b1)
        begin
            $display("FAIL. Expected BRANCH_TAKEN = 1.");
            $finish;
        end
 
        RS1 = 32'b00000000_00000000_00000000_00001100;
        RS2 = 32'b00000000_00000000_00000000_00001000;
        #10;
        if(BRANCH_TAKEN != 1'b0)
        begin
            $display("FAIL. Expected BRANCH_TAKEN = 0.");
            $finish;
        end
 
        RS1 = 32'b11111111_11111111_11111111_11111000;
        RS2 = 32'b00000000_00000000_00000000_00001100;
        #10;
        if(BRANCH_TAKEN != 1'b0)
        begin
            $display("FAIL. Expected BRANCH_TAKEN = 0.");
            $finish;
        end
 
        RS1 = 32'b00000000_00000000_00000000_00001100;
        RS2 = 32'b11111111_11111111_11111111_11111000;
        #10;
        if(BRANCH_TAKEN != 1'b1)
        begin
            $display("FAIL. Expected BRANCH_TAKEN = 1.");
            $finish;
        end
 
        $display("Branch comparator works fine for BLTU.");
 
        $display("Testing branch comparator unit for BGEU.");
 
        FUNCT3 = 3'b111;
        OPCODE_6_TO_2 = `OPCODE_BRANCH;
 
        for(i = 0; i < 10000; i=i+1)
        begin
            RS1 = $random;
            RS2 = $random;
 
            #10;
 
            if(RS1 >= RS2 && BRANCH_TAKEN != 1'b1)
            begin
                $display("FAIL. Expected BRANCH_TAKEN = 1.");
                $finish;
            end
            if(RS1 < RS2 && BRANCH_TAKEN != 1'b0)
            begin
                $display("FAIL. Expected BRANCH_TAKEN = 0.");
                $finish;
            end
        end
 
        RS1 = 32'b11111111_11111111_11111111_11111000;
        RS2 = 32'b11111111_11111111_11111111_11111100;
        #10;
        if(BRANCH_TAKEN != 1'b0)
        begin
            $display("FAIL. Expected BRANCH_TAKEN = 0.");
            $finish;
        end
 
        RS1 = 32'b11111111_11111111_11111111_11111100;
        RS2 = 32'b11111111_11111111_11111111_11111000;
        #10;
        if(BRANCH_TAKEN != 1'b1)
        begin
            $display("FAIL. Expected BRANCH_TAKEN = 1.");
            $finish;
        end
 
        RS1 = 32'b00000000_00000000_00000000_00001000;
        RS2 = 32'b00000000_00000000_00000000_00001100;
        #10;
        if(BRANCH_TAKEN != 1'b0)
        begin
            $display("FAIL. Expected BRANCH_TAKEN = 0.");
            $finish;
        end
 
        RS1 = 32'b00000000_00000000_00000000_00001100;
        RS2 = 32'b00000000_00000000_00000000_00001000;
        #10;
        if(BRANCH_TAKEN != 1'b1)
        begin
            $display("FAIL. Expected BRANCH_TAKEN = 1.");
            $finish;
        end
 
        RS1 = 32'b11111111_11111111_11111111_11111000;
        RS2 = 32'b00000000_00000000_00000000_00001100;
        #10;
        if(BRANCH_TAKEN != 1'b1)
        begin
            $display("FAIL. Expected BRANCH_TAKEN = 1.");
            $finish;
        end
 
        RS1 = 32'b00000000_00000000_00000000_00001100;
        RS2 = 32'b11111111_11111111_11111111_11111000;
        #10;
        if(BRANCH_TAKEN != 1'b0)
        begin
            $display("FAIL. Expected BRANCH_TAKEN = 0.");
            $finish;
        end
 
        $display("Branch comparator works fine for BGEU.");
 
        $display("Testing branch comparator unit for JAL.");
 
        FUNCT3 = 3'bxxx;
        OPCODE_6_TO_2 = `OPCODE_JAL;
 
        #10;
 
        if(BRANCH_TAKEN != 1'b1)
        begin
            $display("FAIL. Expected BRANCH_TAKEN = 1.");
            $finish;
        end
 
        $display("Branch comparator works fine for JAL.");
 
        $display("Testing branch comparator unit for JALR.");
 
        FUNCT3 = 3'bxxx;
        OPCODE_6_TO_2 = `OPCODE_JALR;
 
        #10;
 
        if(BRANCH_TAKEN != 1'b1)
        begin
            $display("FAIL. Expected BRANCH_TAKEN = 1.");
            $finish;
        end
 
        $display("Branch comparator works fine for JALR.");
 
        $display("Branch Unit successfully tested.");
 
    end
 
endmodule

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Subversion Repositories steelcore

[/] [rtl/] [bench/] [tb_branch_unit.v] - Blame information for rev 11

Line No.	Rev	Author	Line
1	11	rafaelcalc	`//////////////////////////////////////////////////////////////////////////////////`
2			`// Engineer: Rafael de Oliveira Calçada (rafaelcalcada@gmail.com)`
3			`//`
4			`// Create Date: 26.04.2020 18:45:28`
5			`// Module Name: tb_branch_unit`
6			`// Project Name: Steel Core`
7			`// Description: Branch decision unit testbench`
8			`//`
9			`// Dependencies: globals.vh`
10			`// branch_unit.v`
11			`//`
12			`// Version 0.01`
13			`//`
14			`//////////////////////////////////////////////////////////////////////////////////`
15
16			`/*********************************************************************************`
17
18			`MIT License`
19
20			`Copyright (c) 2020 Rafael de Oliveira Calçada`
21
22			`Permission is hereby granted, free of charge, to any person obtaining a copy`
23			`of this software and associated documentation files (the "Software"), to deal`
24			`in the Software without restriction, including without limitation the rights`
25			`to use, copy, modify, merge, publish, distribute, sublicense, and/or sell`
26			`copies of the Software, and to permit persons to whom the Software is`
27			`furnished to do so, subject to the following conditions:`
28
29			`The above copyright notice and this permission notice shall be included in all`
30			`copies or substantial portions of the Software.`
31
32			`THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR`
33			`IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,`
34			`FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE`
35			`AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER`
36			`LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,`
37			`OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE`
38			`SOFTWARE.`
39
40			`********************************************************************************/`
41
42			`timescale 1ns / 1ps
43			`include "../globals.vh"
44
45			`module tb_branch_unit();`
46
47			`reg [6:2] OPCODE_6_TO_2;`
48			`reg [31:0] RS1;`
49			`reg [31:0] RS2;`
50			`reg [2:0] FUNCT3;`
51			`wire BRANCH_TAKEN;`
52
53			`integer i = 0;`
54			`reg signed [31:0] rs1s;`
55			`reg signed [31:0] rs2s;`
56
57			`branch_unit dut(`
58			`.OPCODE_6_TO_2(OPCODE_6_TO_2),`
59			`.RS1(RS1),`
60			`.RS2(RS2),`
61			`.FUNCT3(FUNCT3),`
62			`.BRANCH_TAKEN(BRANCH_TAKEN)`
63			`);`
64
65			`initial`
66			`begin`
67
68			`$display("Testing Branch Unit...");`
69
70			`$display("Testing branch comparator unit for BEQ.");`
71
72			`FUNCT3 = 3'b000;`
73			OPCODE_6_TO_2 = `OPCODE_BRANCH;
74
75			`for(i = 0; i < 10000; i=i+1)`
76			`begin`
77			`RS1 = $random;`
78			`RS2 = $random;`
79
80			`#10;`
81
82			`if(RS1 == RS2 && BRANCH_TAKEN != 1'b1)`
83			`begin`
84			`$display("FAIL. Expected BRANCH_TAKEN = 1.");`
85			`$finish;`
86			`end`
87			`if(RS1 != RS2 && BRANCH_TAKEN != 1'b0)`
88			`begin`
89			`$display("FAIL. Expected BRANCH_TAKEN = 0.");`
90			`$finish;`
91			`end`
92			`end`
93
94			`RS1 = $random;`
95			`RS2 = RS1;`
96			`#10;`
97			`if(BRANCH_TAKEN != 1'b1)`
98			`begin`
99			`$display("FAIL. Expected BRANCH_TAKEN = 1.");`
100			`$finish;`
101			`end`
102
103			`$display("Branch comparator works fine for BEQ.");`
104
105			`$display("Testing branch comparator unit for BNE.");`
106
107			`FUNCT3 = 3'b001;`
108			OPCODE_6_TO_2 = `OPCODE_BRANCH;
109
110			`for(i = 0; i < 10000; i=i+1)`
111			`begin`
112			`RS1 = $random;`
113			`RS2 = $random;`
114
115			`#10;`
116
117			`if(RS1 != RS2 && BRANCH_TAKEN != 1'b1)`
118			`begin`
119			`$display("FAIL. Expected BRANCH_TAKEN = 1.");`
120			`$finish;`
121			`end`
122			`if(RS1 == RS2 && BRANCH_TAKEN != 1'b0)`
123			`begin`
124			`$display("FAIL. Expected BRANCH_TAKEN = 0.");`
125			`$finish;`
126			`end`
127			`end`
128
129			`RS1 = $random;`
130			`RS2 = RS1;`
131			`#10;`
132			`if(BRANCH_TAKEN != 1'b0)`
133			`begin`
134			`$display("FAIL. Expected BRANCH_TAKEN = 0.");`
135			`$finish;`
136			`end`
137
138			`$display("Branch comparator works fine for BNE.");`
139
140			`$display("Testing branch comparator unit for BLT.");`
141
142			`FUNCT3 = 3'b100;`
143			OPCODE_6_TO_2 = `OPCODE_BRANCH;
144
145			`for(i = 0; i < 10000; i=i+1)`
146			`begin`
147			`RS1 = $random;`
148			`RS2 = $random;`
149			`rs1s = RS1;`
150			`rs2s = RS2;`
151			`#10;`
152
153			`if(rs1s < rs2s && BRANCH_TAKEN != 1'b1)`
154			`begin`
155			`$display("FAIL. Expected BRANCH_TAKEN = 1.");`
156			`$finish;`
157			`end`
158			`if(rs1s >= rs2s && BRANCH_TAKEN != 1'b0)`
159			`begin`
160			`$display("FAIL. Expected BRANCH_TAKEN = 0.");`
161			`$finish;`
162			`end`
163			`end`
164
165			`RS1 = 32'b11111111_11111111_11111111_11111000;`
166			`RS2 = 32'b11111111_11111111_11111111_11111100;`
167			`#10;`
168			`if(BRANCH_TAKEN != 1'b1)`
169			`begin`
170			`$display("FAIL. Expected BRANCH_TAKEN = 1.");`
171			`$finish;`
172			`end`
173
174			`RS1 = 32'b11111111_11111111_11111111_11111100;`
175			`RS2 = 32'b11111111_11111111_11111111_11111000;`
176			`#10;`
177			`if(BRANCH_TAKEN != 1'b0)`
178			`begin`
179			`$display("FAIL. Expected BRANCH_TAKEN = 0.");`
180			`$finish;`
181			`end`
182
183			`RS1 = 32'b00000000_00000000_00000000_00001000;`
184			`RS2 = 32'b00000000_00000000_00000000_00001100;`
185			`#10;`
186			`if(BRANCH_TAKEN != 1'b1)`
187			`begin`
188			`$display("FAIL. Expected BRANCH_TAKEN = 1.");`
189			`$finish;`
190			`end`
191
192			`RS1 = 32'b00000000_00000000_00000000_00001100;`
193			`RS2 = 32'b00000000_00000000_00000000_00001000;`
194			`#10;`
195			`if(BRANCH_TAKEN != 1'b0)`
196			`begin`
197			`$display("FAIL. Expected BRANCH_TAKEN = 0.");`
198			`$finish;`
199			`end`
200
201			`RS1 = 32'b11111111_11111111_11111111_11111000;`
202			`RS2 = 32'b00000000_00000000_00000000_00001100;`
203			`#10;`
204			`if(BRANCH_TAKEN != 1'b1)`
205			`begin`
206			`$display("FAIL. Expected BRANCH_TAKEN = 1.");`
207			`$finish;`
208			`end`
209
210			`RS1 = 32'b00000000_00000000_00000000_00001100;`
211			`RS2 = 32'b11111111_11111111_11111111_11111000;`
212			`#10;`
213			`if(BRANCH_TAKEN != 1'b0)`
214			`begin`
215			`$display("FAIL. Expected BRANCH_TAKEN = 0.");`
216			`$finish;`
217			`end`
218
219			`$display("Branch comparator works fine for BLT.");`
220
221			`$display("Testing branch comparator unit for BGE.");`
222
223			`FUNCT3 = 3'b101;`
224			OPCODE_6_TO_2 = `OPCODE_BRANCH;
225
226			`for(i = 0; i < 10000; i=i+1)`
227			`begin`
228			`RS1 = $random;`
229			`RS2 = $random;`
230			`rs1s = RS1;`
231			`rs2s = RS2;`
232			`#10;`
233
234			`if(rs1s >= rs2s && BRANCH_TAKEN != 1'b1)`
235			`begin`
236			`$display("FAIL. Expected BRANCH_TAKEN = 1.");`
237			`$finish;`
238			`end`
239			`if(rs1s < rs2s && BRANCH_TAKEN != 1'b0)`
240			`begin`
241			`$display("FAIL. Expected BRANCH_TAKEN = 0.");`
242			`$finish;`
243			`end`
244			`end`
245
246			`RS1 = 32'b11111111_11111111_11111111_11111000;`
247			`RS2 = 32'b11111111_11111111_11111111_11111100;`
248			`#10;`
249			`if(BRANCH_TAKEN != 1'b0)`
250			`begin`
251			`$display("FAIL. Expected BRANCH_TAKEN = 0.");`
252			`$finish;`
253			`end`
254
255			`RS1 = 32'b11111111_11111111_11111111_11111100;`
256			`RS2 = 32'b11111111_11111111_11111111_11111000;`
257			`#10;`
258			`if(BRANCH_TAKEN != 1'b1)`
259			`begin`
260			`$display("FAIL. Expected BRANCH_TAKEN = 1.");`
261			`$finish;`
262			`end`
263
264			`RS1 = 32'b00000000_00000000_00000000_00001000;`
265			`RS2 = 32'b00000000_00000000_00000000_00001100;`
266			`#10;`
267			`if(BRANCH_TAKEN != 1'b0)`
268			`begin`
269			`$display("FAIL. Expected BRANCH_TAKEN = 0.");`
270			`$finish;`
271			`end`
272
273			`RS1 = 32'b00000000_00000000_00000000_00001100;`
274			`RS2 = 32'b00000000_00000000_00000000_00001000;`
275			`#10;`
276			`if(BRANCH_TAKEN != 1'b1)`
277			`begin`
278			`$display("FAIL. Expected BRANCH_TAKEN = 1.");`
279			`$finish;`
280			`end`
281
282			`RS1 = 32'b11111111_11111111_11111111_11111000;`
283			`RS2 = 32'b00000000_00000000_00000000_00001100;`
284			`#10;`
285			`if(BRANCH_TAKEN != 1'b0)`
286			`begin`
287			`$display("FAIL. Expected BRANCH_TAKEN = 0.");`
288			`$finish;`
289			`end`
290
291			`RS1 = 32'b00000000_00000000_00000000_00001100;`
292			`RS2 = 32'b11111111_11111111_11111111_11111000;`
293			`#10;`
294			`if(BRANCH_TAKEN != 1'b1)`
295			`begin`
296			`$display("FAIL. Expected BRANCH_TAKEN = 1.");`
297			`$finish;`
298			`end`
299
300			`$display("Branch comparator works fine for BGE.");`
301
302			`$display("Testing branch comparator unit for BLTU.");`
303
304			`FUNCT3 = 3'b110;`
305			OPCODE_6_TO_2 = `OPCODE_BRANCH;
306
307			`for(i = 0; i < 10000; i=i+1)`
308			`begin`
309			`RS1 = $random;`
310			`RS2 = $random;`
311
312			`#10;`
313
314			`if(RS1 < RS2 && BRANCH_TAKEN != 1'b1)`
315			`begin`
316			`$display("FAIL. Expected BRANCH_TAKEN = 1.");`
317			`$finish;`
318			`end`
319			`if(RS1 >= RS2 && BRANCH_TAKEN != 1'b0)`
320			`begin`
321			`$display("FAIL. Expected BRANCH_TAKEN = 0.");`
322			`$finish;`
323			`end`
324			`end`
325
326			`RS1 = 32'b11111111_11111111_11111111_11111000;`
327			`RS2 = 32'b11111111_11111111_11111111_11111100;`
328			`#10;`
329			`if(BRANCH_TAKEN != 1'b1)`
330			`begin`
331			`$display("FAIL. Expected BRANCH_TAKEN = 1.");`
332			`$finish;`
333			`end`
334
335			`RS1 = 32'b11111111_11111111_11111111_11111100;`
336			`RS2 = 32'b11111111_11111111_11111111_11111000;`
337			`#10;`
338			`if(BRANCH_TAKEN != 1'b0)`
339			`begin`
340			`$display("FAIL. Expected BRANCH_TAKEN = 0.");`
341			`$finish;`
342			`end`
343
344			`RS1 = 32'b00000000_00000000_00000000_00001000;`
345			`RS2 = 32'b00000000_00000000_00000000_00001100;`
346			`#10;`
347			`if(BRANCH_TAKEN != 1'b1)`
348			`begin`
349			`$display("FAIL. Expected BRANCH_TAKEN = 1.");`
350			`$finish;`
351			`end`
352
353			`RS1 = 32'b00000000_00000000_00000000_00001100;`
354			`RS2 = 32'b00000000_00000000_00000000_00001000;`
355			`#10;`
356			`if(BRANCH_TAKEN != 1'b0)`
357			`begin`
358			`$display("FAIL. Expected BRANCH_TAKEN = 0.");`
359			`$finish;`
360			`end`
361
362			`RS1 = 32'b11111111_11111111_11111111_11111000;`
363			`RS2 = 32'b00000000_00000000_00000000_00001100;`
364			`#10;`
365			`if(BRANCH_TAKEN != 1'b0)`
366			`begin`
367			`$display("FAIL. Expected BRANCH_TAKEN = 0.");`
368			`$finish;`
369			`end`
370
371			`RS1 = 32'b00000000_00000000_00000000_00001100;`
372			`RS2 = 32'b11111111_11111111_11111111_11111000;`
373			`#10;`
374			`if(BRANCH_TAKEN != 1'b1)`
375			`begin`
376			`$display("FAIL. Expected BRANCH_TAKEN = 1.");`
377			`$finish;`
378			`end`
379
380			`$display("Branch comparator works fine for BLTU.");`
381
382			`$display("Testing branch comparator unit for BGEU.");`
383
384			`FUNCT3 = 3'b111;`
385			OPCODE_6_TO_2 = `OPCODE_BRANCH;
386
387			`for(i = 0; i < 10000; i=i+1)`
388			`begin`
389			`RS1 = $random;`
390			`RS2 = $random;`
391
392			`#10;`
393
394			`if(RS1 >= RS2 && BRANCH_TAKEN != 1'b1)`
395			`begin`
396			`$display("FAIL. Expected BRANCH_TAKEN = 1.");`
397			`$finish;`
398			`end`
399			`if(RS1 < RS2 && BRANCH_TAKEN != 1'b0)`
400			`begin`
401			`$display("FAIL. Expected BRANCH_TAKEN = 0.");`
402			`$finish;`
403			`end`
404			`end`
405
406			`RS1 = 32'b11111111_11111111_11111111_11111000;`
407			`RS2 = 32'b11111111_11111111_11111111_11111100;`
408			`#10;`
409			`if(BRANCH_TAKEN != 1'b0)`
410			`begin`
411			`$display("FAIL. Expected BRANCH_TAKEN = 0.");`
412			`$finish;`
413			`end`
414
415			`RS1 = 32'b11111111_11111111_11111111_11111100;`
416			`RS2 = 32'b11111111_11111111_11111111_11111000;`
417			`#10;`
418			`if(BRANCH_TAKEN != 1'b1)`
419			`begin`
420			`$display("FAIL. Expected BRANCH_TAKEN = 1.");`
421			`$finish;`
422			`end`
423
424			`RS1 = 32'b00000000_00000000_00000000_00001000;`
425			`RS2 = 32'b00000000_00000000_00000000_00001100;`
426			`#10;`
427			`if(BRANCH_TAKEN != 1'b0)`
428			`begin`
429			`$display("FAIL. Expected BRANCH_TAKEN = 0.");`
430			`$finish;`
431			`end`
432
433			`RS1 = 32'b00000000_00000000_00000000_00001100;`
434			`RS2 = 32'b00000000_00000000_00000000_00001000;`
435			`#10;`
436			`if(BRANCH_TAKEN != 1'b1)`
437			`begin`
438			`$display("FAIL. Expected BRANCH_TAKEN = 1.");`
439			`$finish;`
440			`end`
441
442			`RS1 = 32'b11111111_11111111_11111111_11111000;`
443			`RS2 = 32'b00000000_00000000_00000000_00001100;`
444			`#10;`
445			`if(BRANCH_TAKEN != 1'b1)`
446			`begin`
447			`$display("FAIL. Expected BRANCH_TAKEN = 1.");`
448			`$finish;`
449			`end`
450
451			`RS1 = 32'b00000000_00000000_00000000_00001100;`
452			`RS2 = 32'b11111111_11111111_11111111_11111000;`
453			`#10;`
454			`if(BRANCH_TAKEN != 1'b0)`
455			`begin`
456			`$display("FAIL. Expected BRANCH_TAKEN = 0.");`
457			`$finish;`
458			`end`
459
460			`$display("Branch comparator works fine for BGEU.");`
461
462			`$display("Testing branch comparator unit for JAL.");`
463
464			`FUNCT3 = 3'bxxx;`
465			OPCODE_6_TO_2 = `OPCODE_JAL;
466
467			`#10;`
468
469			`if(BRANCH_TAKEN != 1'b1)`
470			`begin`
471			`$display("FAIL. Expected BRANCH_TAKEN = 1.");`
472			`$finish;`
473			`end`
474
475			`$display("Branch comparator works fine for JAL.");`
476
477			`$display("Testing branch comparator unit for JALR.");`
478
479			`FUNCT3 = 3'bxxx;`
480			OPCODE_6_TO_2 = `OPCODE_JALR;
481
482			`#10;`
483
484			`if(BRANCH_TAKEN != 1'b1)`
485			`begin`
486			`$display("FAIL. Expected BRANCH_TAKEN = 1.");`
487			`$finish;`
488			`end`
489
490			`$display("Branch comparator works fine for JALR.");`
491
492			`$display("Branch Unit successfully tested.");`
493
494			`end`
495
496			`endmodule`