aluctrl.v

来自「基于4个mips核的noc设计」· Verilog 代码 · 共 78 行

module ALUCTRL(functionCode, ALUop, Shamt, ALUctrl);
    input [5:0] functionCode;
    wire [5:0] functionCode;
    input [4:0] ALUop;
    wire [4:0] ALUop;
    input [4:0] Shamt;
    wire [4:0] Shamt;
    output [5:0] ALUctrl;
    reg [5:0] ALUctrl;
    reg [4:0] aluop;
    reg [4:0] shamt;
    reg [5:0] aluCtrl;
    reg [5:0] functioncode;
    
    always @(functionCode or ALUop or Shamt)
        begin : aluctrl_thread
            aluop = ALUop;
            shamt = Shamt;
            case (aluop) //synopsys parallel_case
            0:              aluCtrl = 6'b000010;
            1:              aluCtrl = 6'b000110;
            2:  begin
                functioncode = functionCode;
                functioncode = functioncode[5:0];
                case (functioncode) //synopsys parallel_case
                0:                  case (shamt) //synopsys parallel_case
                1:                  aluCtrl = 6'b001010;
                2:                  aluCtrl = 6'b001011;
                8:                  aluCtrl = 6'b001100;
                default : begin 
                    aluCtrl = 6'b000000;
                    end
                endcase
                2:                  case (shamt) //synopsys parallel_case
                1:                  aluCtrl = 6'b001101;
                2:                  aluCtrl = 6'b001110;
                8:                  aluCtrl = 6'b001111;
                default : begin 
                    aluCtrl = 6'b000000;
                    end
                endcase
                3:                  case (shamt) //synopsys parallel_case
                1:                  aluCtrl = 6'b010000;
                2:                  aluCtrl = 6'b010001;
                8:                  aluCtrl = 6'b010010;
                default : begin 
                    aluCtrl = 6'b000000;
                    end
                endcase
                32:                  aluCtrl = 6'b000010;
                33:                  aluCtrl = 6'b000011;
                35:                  aluCtrl = 6'b000110;
                36:                  aluCtrl = 6'b000000;
                37:                  aluCtrl = 6'b000001;
                38:                  aluCtrl = 6'b000100;
                42:                  aluCtrl = 6'b000111;
                43:                  aluCtrl = 6'b001000;
                default : begin 
                    aluCtrl = 6'b000000;
                    end
                endcase
            end
            3:              aluCtrl = 6'b000011;
            4:              aluCtrl = 6'b000000;
            5:              aluCtrl = 6'b000001;
            6:              aluCtrl = 6'b000100;
            7:              aluCtrl = 6'b000111;
            8:              aluCtrl = 6'b001000;
            9:              aluCtrl = 6'b001001;
            default : begin 
                aluCtrl = 6'b000000;
                end
            endcase
            ALUctrl = aluCtrl;
        end

endmodule