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dragos_don |
/////////////////////////////////////////////////////////////////////
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//// ////
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//// This project has been provided to you on behalf of: ////
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//// ////
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//// S.C. ASICArt S.R.L. ////
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//// www.asicart.com ////
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//// eli_f@asicart.com ////
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//// ////
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//// Author: Dragos Constantin Doncean ////
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//// Email: doncean@asicart.com ////
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//// Mobile: +40-740-936997 ////
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//// ////
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//// Downloaded from: http://www.opencores.org/ ////
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//// ////
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/////////////////////////////////////////////////////////////////////
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//// ////
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//// Copyright (C) 2007 Dragos Constantin Doncean ////
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//// www.asicart.com ////
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//// doncean@asicart.com ////
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//// ////
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//// This source file may be used and distributed without ////
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//// restriction provided that this copyright statement is not ////
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//// removed from the file and that any derivative work contains ////
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//// the original copyright notice and the associated disclaimer.////
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//// ////
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//// THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY ////
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//// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED ////
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//// TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS ////
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//// FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL THE AUTHOR ////
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//// OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, ////
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//// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES ////
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//// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE ////
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//// GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR ////
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//// BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF ////
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//// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT ////
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//// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT ////
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//// OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE ////
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//// POSSIBILITY OF SUCH DAMAGE. ////
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//// ////
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/////////////////////////////////////////////////////////////////////
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//ALU
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module ALU(clk, res, alu_stb_in,
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alu_data_in, alu_data_valid_in,
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alu_result, result_parity,
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output_channel,
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alu_stb_out);
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input clk, res, alu_stb_in;
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input [7:0] alu_data_in;
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input alu_data_valid_in;
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output [15:0] alu_result;
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output result_parity;
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output output_channel;
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output alu_stb_out;
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reg [15:0] alu_result;
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reg result_parity;
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reg [3:0] operator_type;
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reg [2:0] operator_symbol;
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reg output_channel;
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reg [7:0] alu_memory [0:15];
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reg alu_stb_out;
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integer i;
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integer j;
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reg executed_case_once;
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always @ (posedge clk or posedge res)
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if(res)
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begin
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alu_result = 16'b0;
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result_parity = 1'b0;
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operator_type = 4'b1111;
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operator_symbol = 3'b111;
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output_channel = 1'b0;
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for(i = 0; i < 15; i = i + 1)
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alu_memory[i] = 8'b0;
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i = 0;
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j = 0;
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executed_case_once = 1'b0;
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end
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else
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begin
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if(alu_stb_in)
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begin
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operator_type = alu_data_in[7:4];
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operator_symbol = alu_data_in[3:1];
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output_channel = alu_data_in[0];
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executed_case_once = 1'b0;
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end
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if((alu_data_valid_in) && (! alu_stb_in))
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begin
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alu_memory[i] = alu_data_in;
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i = i + 1;
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end
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if((! alu_data_valid_in) && (! alu_stb_in) && (! executed_case_once))
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begin
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executed_case_once = 1'b1;
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if(i !== 0)
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for(j=i;j<16; j=j+1)
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alu_memory[j] = 8'b0;
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i = 0;
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case (operator_type)
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'd0: //Arithmetic
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begin
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$display("Arithmetic operator");
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case(operator_symbol)
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'd0: //Multiply
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begin
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alu_result = (alu_memory[0] * alu_memory[1]);
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$display("OPERATION * (Multiply): alu_memory[0]=%b, alu_memory[1]=%b, alu_result=%b",
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alu_memory[0], alu_memory[1], alu_result);
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end
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'd1: //Divide
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begin
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alu_result = (alu_memory[0] / alu_memory[1]);
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$display("OPERATION / (Divide): alu_memory[0]=%b, alu_memory[1]=%b, alu_result=%b",
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alu_memory[0], alu_memory[1], alu_result);
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end
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'd2: //Add
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begin
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alu_result = (alu_memory[0] + alu_memory[1]);
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$display("OPERATION + (Add): alu_memory[0]=%b, alu_memory[1]=%b, alu_result=%b",
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alu_memory[0], alu_memory[1], alu_result);
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end
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'd3: //Substract
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begin
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alu_result = (alu_memory[0] - alu_memory[1]);
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$display("OPERATION - (Substract): alu_memory[0]=%b, alu_memory[1]=%b, alu_result=%b",
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alu_memory[0], alu_memory[1], alu_result);
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end
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'd4: //Modulus
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begin
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alu_result = (alu_memory[0] % alu_memory[1]);
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$display("OPERATION (Modulus): alu_memory[0]=%b, alu_memory[1]=%b, alu_result=%b",
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alu_memory[0], alu_memory[1], alu_result);
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end
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endcase
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end
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'd1: //Logical
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begin
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$display("Logical operator");
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case(operator_symbol)
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'd0: //Logical negation
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begin
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alu_result = (!alu_memory[0]);
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$display("OPERATION ! (Logical negation): alu_memory[0]=%b, alu_result=%b",
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alu_memory[0], alu_result);
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end
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'd1: //Logical and
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begin
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alu_result = (alu_memory[0] && alu_memory[1]);
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$display("OPERATION && (Logical and): alu_memory[0]=%b, alu_memory[1]=%b, alu_result=%b",
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alu_memory[0], alu_memory[1], alu_result);
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end
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'd2: //Logical or
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begin
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alu_result = (alu_memory[0] || alu_memory[1]);
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$display("OPERATION || (Logical or): alu_memory[0]=%b, alu_memory[1]=%b, alu_result=%b",
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alu_memory[0], alu_memory[1], alu_result);
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end
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endcase
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end
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'd2: //Relational
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begin
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$display("Relational operator");
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case(operator_symbol)
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'd0: //Greater than
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begin
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alu_result = (alu_memory[0] > alu_memory[1]);
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$display("OPERATION > (Greater than): alu_memory[0]=%b, alu_memory[1]=%b, alu_result=%b",
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alu_memory[0], alu_memory[1], alu_result);
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end
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'd1: //Less than
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begin
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alu_result = (alu_memory[0] < alu_memory[1]);
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$display("OPERATION < (Less than): alu_memory[0]=%b, alu_memory[1]=%b, alu_result=%b",
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alu_memory[0], alu_memory[1], alu_result);
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end
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'd2: //Greater than or equal
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begin
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alu_result = (alu_memory[0] >= alu_memory[1]);
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$display("OPERATION >= (Greater than or equal): alu_memory[0]=%b, alu_memory[1]=%b, alu_result=%b",
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alu_memory[0], alu_memory[1], alu_result);
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end
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'd3: //Less than or equal
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begin
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alu_result = (alu_memory[0] <= alu_memory[1]);
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$display("OPERATION <= (Less than or equal): alu_memory[0]=%b, alu_memory[1]=%b, alu_result=%b",
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alu_memory[0], alu_memory[1], alu_result);
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end
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endcase
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end
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'd3: //Equality
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begin
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$display("Equality operator");
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case(operator_symbol)
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'd0: //Equality
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begin
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alu_result = (alu_memory[0] == alu_memory[1]);
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$display("OPERATION == (Equality): alu_memory[0]=%b, alu_memory[1]=%b, alu_result=%b",
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alu_memory[0], alu_memory[1], alu_result);
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end
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'd1: //Inequality
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begin
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alu_result = (alu_memory[0] != alu_memory[1]);
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$display("OPERATION != (Inequality): alu_memory[0]=%b, alu_memory[1]=%b, alu_result=%b",
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alu_memory[0], alu_memory[1], alu_result);
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end
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'd2: //Case equality
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begin
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alu_result = (alu_memory[0] === alu_memory[1]);
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$display("OPERATION === (Case equality): alu_memory[0]=%b, alu_memory[1]=%b, alu_result=%b",
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alu_memory[0], alu_memory[1], alu_result);
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end
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'd3: //Case inequality
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begin
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alu_result = (alu_memory[0] !== alu_memory[1]);
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$display("OPERATION !== (Case inequality): alu_memory[0]=%b, alu_memory[1]=%b, alu_result=%b",
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alu_memory[0], alu_memory[1], alu_result);
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end
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endcase
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end
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'd4: //Bitwise
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begin
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$display("Bitwise operator");
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case(operator_symbol)
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'd0: //Bitwise negation
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begin
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alu_result = (~ alu_memory[0]);
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$display("OPERATION ~ (Bitwise negation): alu_memory[0]=%b, alu_result=%b",
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alu_memory[0], alu_result);
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end
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'd1: //Bitwise and
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begin
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alu_result = (alu_memory[0] & alu_memory[1]);
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$display("OPERATION & (Bitwise and): alu_memory[0]=%b, alu_memory[1]=%b, alu_result=%b",
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alu_memory[0], alu_memory[1], alu_result);
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end
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'd2: //Bitwise or
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begin
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alu_result = (alu_memory[0] | alu_memory[1]);
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$display("OPERATION | (Bitwise or): alu_memory[0]=%b, alu_memory[1]=%b, alu_result=%b",
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alu_memory[0], alu_memory[1], alu_result);
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end
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'd3: //Bitwise xor
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begin
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alu_result = (alu_memory[0] ^ alu_memory[1]);
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$display("OPERATION ^ (Bitwise xor): alu_memory[0]=%b, alu_memory[1]=%b, alu_result=%b",
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alu_memory[0], alu_memory[1], alu_result);
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end
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'd4: //Bitwise xnor (1st operator symbol)
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begin
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alu_result = (alu_memory[0] ^~ alu_memory[1]);
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$display("OPERATION ^~ (Bitwise xnor (1st operator symbol)): alu_memory[0]=%b, alu_memory[1]=%b, alu_result=%b",
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alu_memory[0], alu_memory[1], alu_result);
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end
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'd5: //Bitwise xnor (2nd operator symbol)
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begin
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alu_result = (alu_memory[0] ~^ alu_memory[1]);
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$display("OPERATION ~^ (Bitwise xnor (2nd operator symbol)): alu_memory[0]=%b, alu_memory[1]=%b, alu_result=%b",
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alu_memory[0], alu_memory[1], alu_result);
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end
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endcase
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end
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269 |
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'd5: //Reduction
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begin
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$display("Reduction operator");
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case(operator_symbol)
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'd0: //Reduction and
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begin
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alu_result = (& alu_memory[0]);
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$display("OPERATION & (Reduction and): alu_memory[0]=%b, alu_result=%b",
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alu_memory[0], alu_result);
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end
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'd1: //Reduction nand
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280 |
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begin
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281 |
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alu_result = (~& alu_memory[0]);
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$display("OPERATION ~& (Reduction nand): alu_memory[0]=%b, alu_result=%b",
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alu_memory[0], alu_result);
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284 |
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end
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285 |
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'd2: //Reduction or
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286 |
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begin
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287 |
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alu_result = (| alu_memory[0]);
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288 |
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$display("OPERATION | (Reduction or): alu_memory[0]=%b, alu_result=%b",
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alu_memory[0], alu_result);
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290 |
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end
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'd3: //Reduction nor
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292 |
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begin
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293 |
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alu_result = (~| alu_memory[0]);
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294 |
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$display("OPERATION ~| (Reduction nor): alu_memory[0]=%b, alu_result=%b",
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alu_memory[0], alu_result);
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296 |
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end
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297 |
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'd4: //Reduction xor
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298 |
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begin
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299 |
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alu_result = (^ alu_memory[0]);
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300 |
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$display("OPERATION ^ (Reduction xor): alu_memory[0]=%b, alu_result=%b",
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alu_memory[0], alu_result);
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end
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303 |
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'd5: //Reduction xnor (1st operator symbol)
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304 |
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begin
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305 |
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alu_result = (^~ alu_memory[0]);
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306 |
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$display("OPERATION ^~ (Reduction xnor (1st operator symbol)): alu_memory[0]=%b, alu_result=%b",
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alu_memory[0], alu_result);
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308 |
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end
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309 |
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'd6: //Reduction xnor (2nd operator symbol)
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310 |
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begin
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311 |
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alu_result = (~^ alu_memory[0]);
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312 |
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$display("OPERATION ~^ (Reduction xnor (2nd operator symbol)): alu_memory[0]=%b, alu_result=%b",
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alu_memory[0], alu_result);
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314 |
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end
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315 |
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endcase
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316 |
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end
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317 |
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'd6: //Shift
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318 |
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begin
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319 |
|
|
$display("Shift operator");
|
320 |
|
|
case(operator_symbol)
|
321 |
|
|
'd0: //Right shift
|
322 |
|
|
begin
|
323 |
|
|
alu_result = (alu_memory[0] >> alu_memory[1]);
|
324 |
|
|
$display("OPERATION >> (Right shift): alu_memory[0]=%b, alu_memory[1]=%b, alu_result=%b",
|
325 |
|
|
alu_memory[0], alu_memory[1], alu_result);
|
326 |
|
|
end
|
327 |
|
|
'd1: //Left shift
|
328 |
|
|
begin
|
329 |
|
|
alu_result = (alu_memory[0] << alu_memory[1]);
|
330 |
|
|
$display("OPERATION << (Left shift): alu_memory[0]=%b, alu_memory[1]=%b, alu_result=%b",
|
331 |
|
|
alu_memory[0], alu_memory[1], alu_result);
|
332 |
|
|
end
|
333 |
|
|
endcase
|
334 |
|
|
end
|
335 |
|
|
'd7: //Concatenation
|
336 |
|
|
begin
|
337 |
|
|
//$display("Concatenation operator");
|
338 |
|
|
case(operator_symbol)
|
339 |
|
|
'd0: //Concatenation
|
340 |
|
|
begin
|
341 |
|
|
alu_result = {alu_memory[0], alu_memory[1]};
|
342 |
|
|
$display("OPERATION {} (Concatenation): alu_memory[0]=%b, alu_memory[1]=%b, alu_result=%b",
|
343 |
|
|
alu_memory[0], alu_memory[1], alu_result);
|
344 |
|
|
end
|
345 |
|
|
endcase
|
346 |
|
|
end
|
347 |
|
|
'd8: //Replication
|
348 |
|
|
begin
|
349 |
|
|
$display("Replication operator");
|
350 |
|
|
case(operator_symbol)
|
351 |
|
|
'd0: //Replication
|
352 |
|
|
begin
|
353 |
|
|
alu_result = { 2 {alu_memory[0]} };
|
354 |
|
|
$display("OPERATION { { } } (Replication): alu_memory[0]=%b - replicated twice: alu_result=%b",
|
355 |
|
|
alu_memory[0], alu_result);
|
356 |
|
|
end
|
357 |
|
|
endcase
|
358 |
|
|
end
|
359 |
|
|
'd9: //Conditional
|
360 |
|
|
begin
|
361 |
|
|
$display("Conditional operator");
|
362 |
|
|
case(operator_symbol)
|
363 |
|
|
'd0: //Conditional
|
364 |
|
|
begin
|
365 |
|
|
alu_result = (alu_memory[0] ? alu_memory[1] : alu_memory[2]);
|
366 |
|
|
$display("OPERATION ?: (Conditional): alu_memory[0]=%b, alu_memory[1]=%b, alu_memory[2]=%b, alu_result=%b",
|
367 |
|
|
alu_memory[0], alu_memory[1], alu_memory[2], alu_result);
|
368 |
|
|
end
|
369 |
|
|
endcase
|
370 |
|
|
end
|
371 |
|
|
endcase
|
372 |
|
|
result_parity = ^alu_result; //Parity = XOR of all result's bits
|
373 |
|
|
end
|
374 |
|
|
end
|
375 |
|
|
|
376 |
|
|
always @ (posedge clk)
|
377 |
|
|
alu_stb_out = alu_stb_in;
|
378 |
|
|
|
379 |
|
|
endmodule
|