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