Subversion Repositories steelcore

//////////////////////////////////////////////////////////////////////////////////
// Engineer: Rafael de Oliveira Calçada (rafaelcalcada@gmail.com)
// 
// Create Date: 03.04.2020 18:35:35
// Module Name: tb_decoder
// Project Name: Steel Core
// Description: Decoder testbench
// 
// Dependencies: globals.vh
//               decoder.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_decoder();
 
    reg [6:0] OPCODE;
    reg FUNCT7_5;
    reg [2:0] FUNCT3;
    reg [1:0] IADDER_OUT_1_TO_0;
    reg TRAP_TAKEN;
 
    wire [3:0] ALU_OPCODE;
    wire MEM_WR_REQ;
    wire [1:0] LOAD_SIZE;
    wire LOAD_UNSIGNED;
    wire ALU_SRC;
    wire IADDER_SRC;
    wire CSR_WR_EN;
    wire RF_WR_EN;
    wire [2:0] WB_MUX_SEL;
    wire [2:0] IMM_TYPE;
    wire [2:0] CSR_OP;
    wire ILLEGAL_INSTR;
    wire MISALIGNED_LOAD;
    wire MISALIGNED_STORE;
 
    decoder dut(
 
        .OPCODE(OPCODE),
        .FUNCT7_5(FUNCT7_5),
        .FUNCT3(FUNCT3),
        .IADDER_OUT_1_TO_0(IADDER_OUT_1_TO_0),
        .TRAP_TAKEN(TRAP_TAKEN),        
        .ALU_OPCODE(ALU_OPCODE),
        .MEM_WR_REQ(MEM_WR_REQ),
        .LOAD_SIZE(LOAD_SIZE),
        .LOAD_UNSIGNED(LOAD_UNSIGNED),
        .ALU_SRC(ALU_SRC),
        .IADDER_SRC(IADDER_SRC),
        .CSR_WR_EN(CSR_WR_EN),
        .RF_WR_EN(RF_WR_EN),
        .WB_MUX_SEL(WB_MUX_SEL),
        .IMM_TYPE(IMM_TYPE),
        .CSR_OP(CSR_OP),
        .ILLEGAL_INSTR(ILLEGAL_INSTR),
        .MISALIGNED_LOAD(MISALIGNED_LOAD),
        .MISALIGNED_STORE(MISALIGNED_STORE)
 
    );
 
    reg [4:0] opcode_6_to_2;
    reg [6:0] funct7;
 
    initial
    begin
 
        $display("Testing Decoder...");
 
        $display("Testing OP opcode control signals...");
 
        $display("Testing signals common to all instructions...");
 
        opcode_6_to_2 = `OPCODE_OP;
        OPCODE = {opcode_6_to_2, 2'b11};
        IADDER_OUT_1_TO_0 = 2'b00;
        TRAP_TAKEN = 1'b0;
 
        #10;
        if(MEM_WR_REQ != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end    
        if(MISALIGNED_LOAD != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end    
        if(MISALIGNED_STORE != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end        
        if(ALU_SRC != 1'b1)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(ILLEGAL_INSTR != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(RF_WR_EN != 1'b1)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(CSR_WR_EN != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(WB_MUX_SEL != `WB_ALU)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end       
 
        $display("OP control signals common to all instructions successfully tested.");
 
        $display("Testing ALU_OPCODE signal generation for OP opcode...");
 
        funct7 = `FUNCT7_ADD;
        FUNCT7_5 = funct7[5];
        FUNCT3 = `FUNCT3_ADD;
        #10;
        if(ALU_OPCODE != `ALU_ADD)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
 
        $display("ALU_OPCODE for ADD... OK.");
 
        funct7 = `FUNCT7_SUB;
        FUNCT7_5 = funct7[5];
        FUNCT3 = `FUNCT3_SUB;
        #10;
        if(ALU_OPCODE != `ALU_SUB)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
 
        $display("ALU_OPCODE for SUB... OK.");
 
        funct7 = `FUNCT7_SLT;
        FUNCT7_5 = funct7[5];
        FUNCT3 = `FUNCT3_SLT;
        #10;
        if(ALU_OPCODE != `ALU_SLT)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
 
        $display("ALU_OPCODE for SLT... OK.");
 
        funct7 = `FUNCT7_SLTU;
        FUNCT7_5 = funct7[5];
        FUNCT3 = `FUNCT3_SLTU;
        #10;
        if(ALU_OPCODE != `ALU_SLTU)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
 
        $display("ALU_OPCODE for SLTU... OK.");
 
        funct7 = `FUNCT7_AND;
        FUNCT7_5 = funct7[5];
        FUNCT3 = `FUNCT3_AND;
        #10;
        if(ALU_OPCODE != `ALU_AND)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
 
        $display("ALU_OPCODE for AND... OK.");
 
        funct7 = `FUNCT7_OR;
        FUNCT7_5 = funct7[5];
        FUNCT3 = `FUNCT3_OR;
        #10;
        if(ALU_OPCODE != `ALU_OR)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
 
        $display("ALU_OPCODE for OR... OK.");
 
        funct7 = `FUNCT7_XOR;
        FUNCT7_5 = funct7[5];
        FUNCT3 = `FUNCT3_XOR;
        #10;
        if(ALU_OPCODE != `ALU_XOR)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
 
        $display("ALU_OPCODE for XOR... OK.");
 
        funct7 = `FUNCT7_SLL;
        FUNCT7_5 = funct7[5];
        FUNCT3 = `FUNCT3_SLL;
        #10;
        if(ALU_OPCODE != `ALU_SLL)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
 
        $display("ALU_OPCODE for SLL... OK.");
 
        funct7 = `FUNCT7_SRL;
        FUNCT7_5 = funct7[5];
        FUNCT3 = `FUNCT3_SRL;
        #10;
        if(ALU_OPCODE != `ALU_SRL)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
 
        $display("ALU_OPCODE for SRL... OK.");
 
        funct7 = `FUNCT7_SRA;
        FUNCT7_5 = funct7[5];
        FUNCT3 = `FUNCT3_SRA;
        #10;
        if(ALU_OPCODE != `ALU_SRA)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
 
        $display("ALU_OPCODE for SRA... OK.");
 
        $display("ALU_OPCODE signal generation for OP opcode successfully tested.");
 
        $display("OP control signals successfully tested."); 
 
        $display("Testing OP-IMM opcode control signals...");
 
        $display("Testing signals common to all instructions...");
 
        opcode_6_to_2 = `OPCODE_OP_IMM;
        OPCODE = {opcode_6_to_2, 2'b11};
 
        #10;
        if(MEM_WR_REQ != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end        
        if(MISALIGNED_LOAD != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end    
        if(MISALIGNED_STORE != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end        
        if(ALU_SRC != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(ILLEGAL_INSTR != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(RF_WR_EN != 1'b1)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(CSR_WR_EN != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(WB_MUX_SEL != `WB_ALU)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end        
        if(IMM_TYPE != `I_TYPE)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
 
        $display("OP-IMM control signals common to all instructions successfully tested.");
 
        $display("Testing ALU_OPCODE signal generation for OP-IMM opcode...");
 
        FUNCT7_5 = 1'b0;
        FUNCT3 = `FUNCT3_ADD;
        #10;
        if(ALU_OPCODE != `ALU_ADD)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
 
        FUNCT7_5 = 1'b1;
        FUNCT3 = `FUNCT3_ADD;
        #10;
        if(ALU_OPCODE != `ALU_ADD)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
 
        $display("ALU_OPCODE for ADDI... OK.");
 
        FUNCT7_5 = 1'b0;
        FUNCT3 = `FUNCT3_SLT;
        #10;
        if(ALU_OPCODE != `ALU_SLT)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
 
        FUNCT7_5 = 1'b1;
        FUNCT3 = `FUNCT3_SLT;
        #10;
        if(ALU_OPCODE != `ALU_SLT)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
 
        $display("ALU_OPCODE for SLTI... OK.");
 
        FUNCT7_5 = 1'b0;
        FUNCT3 = `FUNCT3_SLTU;
        #10;
        if(ALU_OPCODE != `ALU_SLTU)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
 
        FUNCT7_5 = 1'b1;
        FUNCT3 = `FUNCT3_SLTU;
        #10;
        if(ALU_OPCODE != `ALU_SLTU)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
 
        $display("ALU_OPCODE for SLTIU... OK.");
 
        FUNCT7_5 = 1'b0;
        FUNCT3 = `FUNCT3_AND;
        #10;
        if(ALU_OPCODE != `ALU_AND)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
 
        FUNCT7_5 = 1'b1;
        FUNCT3 = `FUNCT3_AND;
        #10;
        if(ALU_OPCODE != `ALU_AND)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
 
        $display("ALU_OPCODE for ANDI... OK.");
 
        FUNCT7_5 = 1'b0;
        FUNCT3 = `FUNCT3_OR;
        #10;
        if(ALU_OPCODE != `ALU_OR)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
 
        FUNCT7_5 = 1'b1;
        FUNCT3 = `FUNCT3_OR;
        #10;
        if(ALU_OPCODE != `ALU_OR)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
 
        $display("ALU_OPCODE for ORI... OK.");
 
        FUNCT7_5 = 1'b0;
        FUNCT3 = `FUNCT3_XOR;
        #10;
        if(ALU_OPCODE != `ALU_XOR)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
 
        FUNCT7_5 = 1'b1;
        FUNCT3 = `FUNCT3_XOR;
        #10;
        if(ALU_OPCODE != `ALU_XOR)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
 
        $display("ALU_OPCODE for XORI... OK.");
 
        funct7 = `FUNCT7_SLL;
        FUNCT7_5 = funct7[5];
        FUNCT3 = `FUNCT3_SLL;
        #10;
        if(ALU_OPCODE != `ALU_SLL)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
 
        $display("ALU_OPCODE for SLLI... OK.");
 
        funct7 = `FUNCT7_SRL;
        FUNCT7_5 = funct7[5];
        FUNCT3 = `FUNCT3_SRL;
        #10;
        if(ALU_OPCODE != `ALU_SRL)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
 
        $display("ALU_OPCODE for SRLI... OK.");
 
        funct7 = `FUNCT7_SRA;
        FUNCT7_5 = funct7[5];
        FUNCT3 = `FUNCT3_SRA;
        #10;
        if(ALU_OPCODE != `ALU_SRA)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
 
        $display("ALU_OPCODE for SRAI... OK.");
 
        $display("ALU_OPCODE signal generation for OP-IMM opcode successfully tested.");
 
        $display("OP-IMM control signals successfully tested.");         
 
        $display("Testing LOAD opcode control signals...");
 
        $display("Testing signals common to all instructions...");
 
        opcode_6_to_2 = `OPCODE_LOAD;
        OPCODE = {opcode_6_to_2, 2'b11};
 
        #10;
        if(MEM_WR_REQ != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(MISALIGNED_LOAD != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end    
        if(MISALIGNED_STORE != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end        
        if(ILLEGAL_INSTR != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(RF_WR_EN != 1'b1)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(WB_MUX_SEL != `WB_LU)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end       
        if(IADDER_SRC != 1'b1)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(CSR_WR_EN != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end        
        if(IMM_TYPE != `I_TYPE)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
 
        $display("LOAD control signals common to all instructions successfully tested.");
 
        $display("Testing load unit control signals generation...");
 
        FUNCT3 = `FUNCT3_BYTE;
        #10;
        if(LOAD_SIZE != `LOAD_BYTE)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(LOAD_UNSIGNED != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(MISALIGNED_LOAD != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
 
        $display("Load unit signals for LB... OK.");
 
        $display("Testing signal MISALIGNED_LOAD for LB...");
 
        FUNCT3 = `FUNCT3_BYTE;
        IADDER_OUT_1_TO_0 = 2'b01;
        #10;
        if(MISALIGNED_LOAD != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        FUNCT3 = `FUNCT3_BYTE;
        IADDER_OUT_1_TO_0 = 2'b10;
        #10;
        if(MISALIGNED_LOAD != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end    
        FUNCT3 = `FUNCT3_BYTE;
        IADDER_OUT_1_TO_0 = 2'b11;
        #10;
        if(MISALIGNED_LOAD != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end    
 
        $display("MISALIGNED_LOAD generation for LB OK.");
 
        FUNCT3 = `FUNCT3_HALF;
        IADDER_OUT_1_TO_0 = 2'b00;
        #10;
        if(LOAD_SIZE != `LOAD_HALF)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(LOAD_UNSIGNED != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(MISALIGNED_LOAD != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
 
        $display("Load unit signals for LH... OK.");
 
        $display("Testing signal MISALIGNED_LOAD for LH...");
 
        FUNCT3 = `FUNCT3_HALF;
        IADDER_OUT_1_TO_0 = 2'b01;
        #10;
        if(MISALIGNED_LOAD != 1'b1)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        FUNCT3 = `FUNCT3_HALF;
        IADDER_OUT_1_TO_0 = 2'b10;
        #10;
        if(MISALIGNED_LOAD != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end    
        FUNCT3 = `FUNCT3_HALF;
        IADDER_OUT_1_TO_0 = 2'b11;
        #10;
        if(MISALIGNED_LOAD != 1'b1)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end    
 
        $display("MISALIGNED_LOAD generation for LH OK.");
 
        FUNCT3 = `FUNCT3_WORD;
        IADDER_OUT_1_TO_0 = 2'b00;
        #10;
        if(LOAD_SIZE != `LOAD_WORD)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(LOAD_UNSIGNED != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(MISALIGNED_LOAD != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
 
        $display("Load unit signals for LW... OK.");
 
        $display("Testing signal MISALIGNED_LOAD for LW...");
 
        FUNCT3 = `FUNCT3_WORD;
        IADDER_OUT_1_TO_0 = 2'b01;
        #10;
        if(MISALIGNED_LOAD != 1'b1)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        FUNCT3 = `FUNCT3_WORD;
        IADDER_OUT_1_TO_0 = 2'b10;
        #10;
        if(MISALIGNED_LOAD != 1'b1)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end    
        FUNCT3 = `FUNCT3_WORD;
        IADDER_OUT_1_TO_0 = 2'b11;
        #10;
        if(MISALIGNED_LOAD != 1'b1)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end    
 
        $display("MISALIGNED_LOAD generation for LW OK.");
 
        FUNCT3 = `FUNCT3_BYTE_U;
        IADDER_OUT_1_TO_0 = 2'b00;
        #10;
        if(LOAD_SIZE != `LOAD_BYTE)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(LOAD_UNSIGNED != 1'b1)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(MISALIGNED_LOAD != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
 
        $display("Load unit signals for LBU... OK.");
 
        $display("Testing signal MISALIGNED_LOAD for LBU...");
 
        FUNCT3 = `FUNCT3_BYTE_U;
        IADDER_OUT_1_TO_0 = 2'b01;
        #10;
        if(MISALIGNED_LOAD != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        FUNCT3 = `FUNCT3_BYTE_U;
        IADDER_OUT_1_TO_0 = 2'b10;
        #10;
        if(MISALIGNED_LOAD != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end    
        FUNCT3 = `FUNCT3_BYTE_U;
        IADDER_OUT_1_TO_0 = 2'b11;
        #10;
        if(MISALIGNED_LOAD != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end    
 
        $display("MISALIGNED_LOAD generation for LBU OK.");
 
        FUNCT3 = `FUNCT3_HALF_U;
        IADDER_OUT_1_TO_0 = 2'b00;
        #10;
        if(LOAD_SIZE != `LOAD_HALF)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(LOAD_UNSIGNED != 1'b1)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end        
        if(MISALIGNED_LOAD != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
 
        $display("Load unit signals for LHU... OK.");
 
        $display("Testing signal MISALIGNED_LOAD for LHU...");
 
        FUNCT3 = `FUNCT3_HALF_U;
        IADDER_OUT_1_TO_0 = 2'b01;
        #10;
        if(MISALIGNED_LOAD != 1'b1)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        FUNCT3 = `FUNCT3_HALF_U;
        IADDER_OUT_1_TO_0 = 2'b10;
        #10;
        if(MISALIGNED_LOAD != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end    
        FUNCT3 = `FUNCT3_HALF_U;
        IADDER_OUT_1_TO_0 = 2'b11;
        #10;
        if(MISALIGNED_LOAD != 1'b1)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end    
 
        $display("MISALIGNED_LOAD generation for LHU OK.");
 
        $display("Signals for load unit successfuly tested.");
 
        $display("LOAD opcode successfully tested.");
 
        $display("Testing STORE opcode operation...");
 
        $display("Testing signals common to all instructions...");
 
        opcode_6_to_2 = `OPCODE_STORE;
        OPCODE = {opcode_6_to_2, 2'b11};
        IADDER_OUT_1_TO_0 = 2'b00;
 
        #10;
        if(MEM_WR_REQ != 1'b1)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(MISALIGNED_LOAD != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end    
        if(MISALIGNED_STORE != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end              
        if(ILLEGAL_INSTR != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(RF_WR_EN != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end       
        if(IADDER_SRC != 1'b1)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(CSR_WR_EN != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end        
        if(IMM_TYPE != `S_TYPE)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
 
        TRAP_TAKEN = 1'b1;
        #10;
        if(MEM_WR_REQ != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        TRAP_TAKEN = 1'b0;
 
        $display("STORE control signals common to all instructions successfully tested.");
 
        $display("Testing signal MISALIGNED_STORE for SB...");
 
        FUNCT3 = `FUNCT3_BYTE;
        IADDER_OUT_1_TO_0 = 2'b00;
        #10;
        if(MISALIGNED_STORE != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        FUNCT3 = `FUNCT3_BYTE;
        IADDER_OUT_1_TO_0 = 2'b01;
        #10;
        if(MISALIGNED_STORE != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        FUNCT3 = `FUNCT3_BYTE;
        IADDER_OUT_1_TO_0 = 2'b10;
        #10;
        if(MISALIGNED_STORE != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end    
        FUNCT3 = `FUNCT3_BYTE;
        IADDER_OUT_1_TO_0 = 2'b11;
        #10;
        if(MISALIGNED_STORE != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end    
 
        $display("MISALIGNED_STORE generation for SB OK.");                       
 
        $display("Testing signal MISALIGNED_STORE for SH...");
 
        FUNCT3 = `FUNCT3_HALF;
        IADDER_OUT_1_TO_0 = 2'b00;
        #10;
        if(MISALIGNED_STORE != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        FUNCT3 = `FUNCT3_HALF;
        IADDER_OUT_1_TO_0 = 2'b01;
        #10;
        if(MISALIGNED_STORE != 1'b1)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        FUNCT3 = `FUNCT3_HALF;
        IADDER_OUT_1_TO_0 = 2'b10;
        #10;
        if(MISALIGNED_STORE != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end    
        FUNCT3 = `FUNCT3_HALF;
        IADDER_OUT_1_TO_0 = 2'b11;
        #10;
        if(MISALIGNED_STORE != 1'b1)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end    
 
        $display("MISALIGNED_STORE generation for SH OK.");
 
        $display("Testing signal MISALIGNED_STORE for SW...");
 
        FUNCT3 = `FUNCT3_WORD;
        IADDER_OUT_1_TO_0 = 2'b00;
        #10;
        if(MISALIGNED_STORE != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        FUNCT3 = `FUNCT3_WORD;
        IADDER_OUT_1_TO_0 = 2'b01;
        #10;
        if(MISALIGNED_STORE != 1'b1)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        FUNCT3 = `FUNCT3_WORD;
        IADDER_OUT_1_TO_0 = 2'b10;
        #10;
        if(MISALIGNED_STORE != 1'b1)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end    
        FUNCT3 = `FUNCT3_WORD;
        IADDER_OUT_1_TO_0 = 2'b11;
        #10;
        if(MISALIGNED_STORE != 1'b1)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end    
 
        $display("MISALIGNED_STORE generation for SW OK.");
 
        $display("STORE operation successfully tested.");
 
        $display("Testing BRANCH opcode signals generation...");
 
        opcode_6_to_2 = `OPCODE_BRANCH;
        OPCODE = {opcode_6_to_2, 2'b11};
        IADDER_OUT_1_TO_0 = 2'b00;
 
        #10;
        if(MEM_WR_REQ != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(ILLEGAL_INSTR != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(RF_WR_EN != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(IADDER_SRC != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(CSR_WR_EN != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end        
        if(IMM_TYPE != `B_TYPE)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
 
        $display("BRANCH control signals successfully tested.");
 
        $display("Testing JAL control signals generation...");
 
        opcode_6_to_2 = `OPCODE_JAL;
        OPCODE = {opcode_6_to_2, 2'b11};
 
        #10;
        if(MEM_WR_REQ != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(ILLEGAL_INSTR != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(RF_WR_EN != 1'b1)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(IADDER_SRC != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(WB_MUX_SEL != `WB_PC_PLUS)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end      
        if(CSR_WR_EN != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end        
        if(IMM_TYPE != `J_TYPE)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
 
        $display("JAL control signals successfully tested.");
 
        $display("Testing JALR control signals generation...");
 
        opcode_6_to_2 = `OPCODE_JALR;
        OPCODE = {opcode_6_to_2, 2'b11};
 
        #10;
        if(MEM_WR_REQ != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(ILLEGAL_INSTR != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(RF_WR_EN != 1'b1)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
 
        if(WB_MUX_SEL != `WB_PC_PLUS)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(IADDER_SRC != 1'b1)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end        
        if(CSR_WR_EN != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end        
        if(IMM_TYPE != `I_TYPE)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
 
        $display("JALR control signals successfully tested.");
 
        $display("Testing LUI opcode operation...");
 
        opcode_6_to_2 = `OPCODE_LUI;
        OPCODE = {opcode_6_to_2, 2'b11};
 
        #10;
        if(MEM_WR_REQ != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(ILLEGAL_INSTR != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(RF_WR_EN != 1'b1)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
 
        if(WB_MUX_SEL != `WB_IMM)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end  
        if(CSR_WR_EN != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end        
        if(IMM_TYPE != `U_TYPE)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
 
        $display("LUI control signals successfully tested.");
 
        $display("Testing AUIPC control signals generation...");
 
        opcode_6_to_2 = `OPCODE_AUIPC;
        OPCODE = {opcode_6_to_2, 2'b11};
 
        #10;
        if(MEM_WR_REQ != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(ILLEGAL_INSTR != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(RF_WR_EN != 1'b1)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(WB_MUX_SEL != `WB_IADDER_OUT)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(IADDER_SRC != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end   
        if(CSR_WR_EN != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end        
        if(IMM_TYPE != `U_TYPE)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
 
        $display("AUIPC control signals successfully tested.");
 
        $display("Testing MISC-MEM control signals generation...");
 
        opcode_6_to_2 = `OPCODE_MISC_MEM;
        OPCODE = {opcode_6_to_2, 2'b11};
 
        #10;
        if(MEM_WR_REQ != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(ILLEGAL_INSTR != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(RF_WR_EN != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(CSR_WR_EN != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
 
        $display("MISM-MEM control signals successfully tested.");
 
        $display("Testing SYSteel Core control signals operation...");
 
        $display("Testing ECALL, EBREAK, MRET and WFI instructions...");
 
        opcode_6_to_2 = `OPCODE_SYSTEM;
        OPCODE = {opcode_6_to_2, 2'b11};
        FUNCT3 = 3'b000;
 
        #10;
        if(MEM_WR_REQ != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(ILLEGAL_INSTR != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(RF_WR_EN != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(CSR_WR_EN != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
 
        $display("ECALL, EBREAK, MRET and WFI successfully tested.");
 
        $display("Testing CSRRW...");
 
        FUNCT3 = 3'b001;
        #10;
        if(ILLEGAL_INSTR != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(RF_WR_EN != 1'b1)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(CSR_WR_EN != 1'b1)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(IMM_TYPE != `CSR_TYPE)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(CSR_OP != FUNCT3)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
 
        $display("CSRRW successfully tested.");
 
        $display("Testing CSRRS...");
 
        FUNCT3 = 3'b010;
        #10;
        if(ILLEGAL_INSTR != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(RF_WR_EN != 1'b1)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(CSR_WR_EN != 1'b1)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(IMM_TYPE != `CSR_TYPE)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(CSR_OP != FUNCT3)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
 
        $display("CSRRS successfully tested.");
 
        $display("Testing CSRRC...");
 
        FUNCT3 = 3'b011;
        #10;
        if(ILLEGAL_INSTR != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(RF_WR_EN != 1'b1)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(CSR_WR_EN != 1'b1)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(IMM_TYPE != `CSR_TYPE)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(CSR_OP != FUNCT3)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
 
        $display("CSRRC successfully tested.");
 
        $display("Testing CSRRWI...");
 
        FUNCT3 = 3'b101;
        #10;
        if(ILLEGAL_INSTR != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(RF_WR_EN != 1'b1)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(CSR_WR_EN != 1'b1)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(IMM_TYPE != `CSR_TYPE)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(CSR_OP != FUNCT3)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
 
        $display("CSRRWI successfully tested.");
 
        $display("Testing CSRRSI...");
 
        FUNCT3 = 3'b110;
        #10;
        if(ILLEGAL_INSTR != 1'b0)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(RF_WR_EN != 1'b1)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(CSR_WR_EN != 1'b1)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(IMM_TYPE != `CSR_TYPE)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
        if(CSR_OP != FUNCT3)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
 
        $display("CSRRSI successfully tested.");
 
        $display("Steel Core control signals successfully tested.");
 
        $display("Testing illegal instructions...");
 
        OPCODE = {`OPCODE_OP,2'b10};
        #10;
        if(ILLEGAL_INSTR != 1'b1)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
 
        OPCODE = {`OPCODE_OP,2'b01};
        #10;
        if(ILLEGAL_INSTR != 1'b1)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
 
        OPCODE = {5'b11111,2'b11};
        #10;
        if(ILLEGAL_INSTR != 1'b1)
        begin
            $display("FAIL. Check the results.");
            $finish;
        end
 
        $display("Illegal instructions successfully tested.");
 
        $display("Decoder successfully tested.");
 
    end
 
endmodule