📄 3des部分代码.txt
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module lun(clk,reset,en,datain,keyin,dataout);
input clk,reset,en;
input [64:1]datain;
input [48:1]keyin;
output[64:0]dataout;
wire [48:1]b;
reg[32:1]c;
reg[64:1] dataout;
ezihuan e(datain[32:1],keyin,b)
always@(posedge clk or posedge reset)
begin
if(reset) begin
dataout<=64'b0;
end
else if(en)
begin
dataout<={datain[32:1],{ c[25],c[4],c[11],c[22],c[6],c[30],c[13],c[19],
c[9],c[3],c[27],c[32],c[14],c[24],c[8],c[2],
c[10],c[31],c[18],c[5],c[26],c[23],c[15],c[1],
c[17],c[28],c[12],c[29],c[21],c20],c[7],c[16]}^
datain[64:33]};
end
end
always
begin
case({b[6],b[1]}) /*第一个S盒*/
2'd0:
case({b[5],b[4],b[3],b[2]})
4'd0:c[4:1]<=14;
4'd1:c[4:1]<=4;
4'd2:c[4:1]<=13;
4'd3:c[4:1]<=1;
4'd4:c[4:1]<=2;
4'd5:c[4:1]<=15;
4'd6:c[4:1]<=11;
4'd7:c[4:1]<=8;
4'd8:c[4:1]<=3;
4'd9:c[4:1]<=10;
4'd10:c[4:1]<=6;
4'd11:c[4:1]<=12;
4'd12:c[4:1]<=5;
4'd13:c[4:1]<=9;
4'd14:c[4:1]<=0;
4'd15:c[4:1]<=7;
default:c[4:1]<=0;
endcase
2'd1:
case({b[5],b[4],b[3],b[2]})
4'd0:c[4:1]<=0;
4'd1:c[4:1]<=15;
4'd2:c[4:1]<=7;
4'd3:c[4:1]<=4;
4'd4:c[4:1]<=14;
4'd5:c[4:1]<=2;
4'd6:c[4:1]<=13;
4'd7:c[4:1]<=1;
4'd8:c[4:1]<=10;
4'd9:c[4:1]<=6;
4'd10:c[4:1]<=12;
4'd11:c[4:1]<=11;
4'd12:c[4:1]<=9;
4'd13:c[4:1]<=5;
4'd14:c[4:1]<=3;
4'd15:c[4:1]<=8;
default:c[4:1]<=0;
endcase
2'd2:
case({b[5],b[4],b[3],b[2]})
4'd0:c[4:1]<=4;
4'd1:c[4:1]<=1;
4'd2:c[4:1]<=14;
4'd3:c[4:1]<=8;
4'd4:c[4:1]<=13;
4'd5:c[4:1]<=6;
4'd6:c[4:1]<=2;
4'd7:c[4:1]<=11;
4'd8:c[4:1]<=15;
4'd9:c[4:1]<=12;
4'd10:c[4:1]<=9;
4'd11:c[4:1]<=7;
4'd12:c[4:1]<=3;
4'd13:c[4:1]<=10;
4'd14:c[4:1]<=5;
4'd15:c[4:1]<=0;
default:c[4:1]<=0;
endcase
2'd3:
case({b[5],b[4],b[3],b[2]})
4'd0:c[4:1]<=15;
4'd1:c[4:1]<=12;
4'd2:c[4:1]<=8;
4'd3:c[4:1]<=2;
4'd4:c[4:1]<=4;
4'd5:c[4:1]<=9;
4'd6:c[4:1]<=1;
4'd7:c[4:1]<=7;
4'd8:c[4:1]<=5;
4'd9:c[4:1]<=11;
4'd10:c[4:1]<=3;
4'd11:c[4:1]<=14;
4'd12:c[4:1]<=10;
4'd13:c[4:1]<=0;
4'd14:c[4:1]<=6;
4'd15:c[4:1]<=13;
default:c[4:1]<=0;
endcase
default:c[4:1]<0;
endcase
case({b[12],b[7]}) /*第二个S盒*/
2'd0:
case({b[11],b[10],b[9],b[8]})
4'd0:c[8:5]<=15;
4'd1:c[8:5]<=1;
4'd2:c[8:5]<=8;
4'd3:c[8:5]<=14;
4'd4:c[8:5]<=16;
4'd5:c[8:5]<=11;
4'd6:c[8:5]<=3;
4'd7:c[8:5]<=4;
4'd8:c[8:5]<=9;
4'd9:c[8:5]<=7;
4'd10:c[8:5]<=2;
4'd11:c[8:5]<=13;
4'd12:c[8:5]<=12;
4'd13:c[8:5]<=0;
4'd14:c[8:5]<=5;
4'd15:c[8:5]<=10;
default:c[8:5]<=0;
endcase
2'd1:
case({b[11],b[10],b[9],b[8]})
4'd0:c[8:5]<=3;
4'd1:c[8:5]<=13;
4'd2:c[8:5]<=4;
4'd3:c[8:5]<=7;
4'd4:c[8:5]<=15;
4'd5:c[8:5]<=2;
4'd6:c[8:5]<=8;
4'd7:c[8:5]<=14;
4'd8:c[8:5]<=12;
4'd9:c[8:5]<=0;
4'd10:c[8:5]<=1;
4'd11:c[8:5]<=10;
4'd12:c[8:5]<=6;
4'd13:c[8:5]<=9;
4'd14:c[8:5]<=11;
4'd15:c[8:5]<=5;
default:c[8:5]<=0;
endcase
2'd2:
case({b[11],b[10],b[9],b[8]})
4'd0:c[8:5]<=0;
4'd1:c[8:5]<=14;
4'd2:c[8:5]<=7;
4'd3:c[8:5]<=11;
4'd4:c[8:5]<=10;
4'd5:c[8:5]<=4;
4'd6:c[8:5]<=13;
4'd7:c[8:5]<=1;
4'd8:c[8:5]<=5;
4'd9:c[8:5]<=8;
4'd10:c[8:5]<=12;
4'd11:c[8:5]<=6;
4'd12:c[8:5]<=9;
4'd13:c[8:5]<=3;
4'd14:c[8:5]<=2;
4'd15:c[8:5]<=15;
default:c[8:5]<=0;
endcase
2'd3:
case({b[11],b[10],b[9],b[8]})
4'd0:c[8:5]<=13;
4'd1:c[8:5]<=8;
4'd2:c[8:5]<=10;
4'd3:c[8:5]<=1;
4'd4:c[8:5]<=3;
4'd5:c[8:5]<=15;
4'd6:c[8:5]<=4;
4'd7:c[8:5]<=2;
4'd8:c[8:5]<=11;
4'd9:c[8:5]<=6;
4'd10:c[8:5]<=7;
4'd11:c[8:5]<=12;
4'd12:c[8:5]<=0;
4'd13:c[8:5]<=5;
4'd14:c[8:5]<=14;
4'd15:c[8:5]<=9;
default:c[8:5]<=0;
endcase
default :c[8:5]<=0;
endcase
case({b[18],b[13]})/*第三个S盒*/
2'd0:
case({b[17],b[16],b[15],b[14]})
4'd0:c[12:9]<=10;
4'd1:c[12:9]<=0;
4'd2:c[12:9]<=9;
4'd3:c[12:9]<=14;
4'd4:c[12:9]<=6;
4'd5:c[12:9]<=3;
4'd6:c[12:9]<=15;
4'd7:c[12:9]<=5;
4'd8:c[12:9]<=1;
4'd9:c[12:9]<=13;
4'd10:c[12:9]<=12;
4'd11:c[12:9]<=7;
4'd12:c[12:9]<=11;
4'd13:c[12:9]<=4;
4'd14:c[12:9]<=2;
4'd15:c[12:9]<=8;
default:c[12:9]<=0;
endcase
2'd1:
case({b[17],b[16],b[15],b[14]})
4'd0:c[12:9]<=13;
4'd1:c[12:9]<=7;
4'd2:c[12:9]<=0;
4'd3:c[12:9]<=9;
4'd4:c[12:9]<=3;
4'd5:c[12:9]<=4;
4'd6:c[12:9]<=6;
4'd7:c[12:9]<=10;
4'd8:c[12:9]<=2;
4'd9:c[12:9]<=8;
4'd10:c[12:9]<=5;
4'd11:c[12:9]<=14;
4'd12:c[12:9]<=12;
4'd13:c[12:9]<=11;
4'd14:c[12:9]<=15;
4'd15:c[12:9]<=1;
default:c[12:9]<=0;
endcase
2'd2:
case({b[17],b[16],b[15],b[14]})
4'd0:c[12:9]<=13;
4'd1:c[12:9]<=6;
4'd2:c[12:9]<=4;
4'd3:c[12:9]<=9;
4'd4:c[12:9]<=8;
4'd5:c[12:9]<=15;
4'd6:c[12:9]<=3;
4'd7:c[12:9]<=0;
4'd8:c[12:9]<=11;
4'd9:c[12:9]<=1;
4'd10:c[12:9]<=2;
4'd11:c[12:9]<=12;
4'd12:c[12:9]<=5;
4'd13:c[12:9]<=10;
4'd14:c[12:9]<=14;
4'd15:c[12:9]<=7;
default:c[12:9]<=0;
endcase
2'd3:
case({b[17],b[16],b[15],b[14]})
4'd0:c[12:9]<=1;
4'd1:c[12:9]<=10;
4'd2:c[12:9]<=13;
4'd3:c[12:9]<=0;
4'd4:c[12:9]<=6;
4'd5:c[12:9]<=9;
4'd6:c[12:9]<=8;
4'd7:c[12:9]<=7;
4'd8:c[12:9]<=4;
4'd9:c[12:9]<=15;
4'd10:c[12:9]<=14;
4'd11:c[12:9]<=3;
4'd12:c[12:9]<=11;
4'd13:c[12:9]<=5;
4'd14:c[12:9]<=2;
4'd15:c[12:9]<=12;
default:c[12:9]<=0;
endcase
default:c[12:9]<=0;
endcase
case({b[24],b[19]})/*第四个盒*/
2'd0:
case({b[23],b[22],b[21],b[20]})
4'd0:c[16:13]<=7;
4'd1:c[16:13]<=13;
4'd2:c[16:13]<=14;
4'd3:c[16:13]<=3;
4'd4:c[16:13]<=0;
4'd5:c[16:13]<=6;
4'd6:c[16:13]<=9;
4'd7:c[16:13]<=10;
4'd8:c[16:13]<=1;
4'd9:c[16:13]<=2;
4'd10:c[16:13]<=8;
4'd11:c[16:13]<=5;
4'd12:c[16:13]<=11;
4'd13:c[16:13]<=12;
4'd14:c[16:13]<=4;
4'd15:c[16:13]<=15;
default:c[16:13]<=0;
endcase
2'd1:
case({b[23],b[22],b[21],b[20]})
4'd0:c[16:13]<=13;
4'd1:c[16:13]<=8;
4'd2:c[16:13]<=11;
4'd3:c[16:13]<=5;
4'd4:c[16:13]<=6;
4'd5:c[16:13]<=15;
4'd6:c[16:13]<=0;
4'd7:c[16:13]<=3;
4'd8:c[16:13]<=4;
4'd9:c[16:13]<=7;
4'd10:c[16:13]<=2;
4'd11:c[16:13]<=12;
4'd12:c[16:13]<=1;
4'd13:c[16:13]<=10;
4'd14:c[16:13]<=14;
4'd15:c[16:13]<=9;
default:c[16:13]<=0;
endcase
2'd2:
case({b[23],b[22],b[21],b[20]})
4'd0:c[16:13]<=10;
4'd1:c[16:13]<=6;
4'd2:c[16:13]<=9;
4'd3:c[16:13]<=0;
4'd4:c[16:13]<=12;
4'd5:c[16:13]<=11;
4'd6:c[16:13]<=7;
4'd7:c[16:13]<=13;
4'd8:c[16:13]<=15;
4'd9:c[16:13]<=1;
4'd10:c[16:13]<=3;
4'd11:c[16:13]<=14;
4'd12:c[16:13]<=5;
4'd13:c[16:13]<=2;
4'd14:c[16:13]<=8;
4'd15:c[16:13]<=4;
default:c[16:13]<=0;
endcase
2'd3:
case({b[23],b[22],b[21],b[20]})
4'd0:c[16:13]<=3;
4'd1:c[16:13]<=15;
4'd2:c[16:13]<=0;
4'd3:c[16:13]<=6;
4'd4:c[16:13]<=10;
4'd5:c[16:13]<=1;
4'd6:c[16:13]<=13;
4'd7:c[16:13]<=8;
4'd8:c[16:13]<=9;
4'd9:c[16:13]<=4;
4'd10:c[16:13]<=5;
4'd11:c[16:13]<=11;
4'd12:c[16:13]<=12;
4'd13:c[16:13]<=7;
4'd14:c[16:13]<=2;
4'd15:c[16:13]<=14;
default:c[16:13]<=0;
endcase
default:c[16:13]<=0;
endcase
case({b[30],b[25]})/*第六个S盒*/
2'd0:
case({b[29],b[28],b[27],b[26]})
4'd0:c[20:17]<=2;
4'd1:c[20:17]<=12;
4'd2:c[20:17]<=4;
4'd3:c[20:17]<=1;
4'd4:c[20:17]<=7;
4'd5:c[20:17]<=10;
4'd6:c[20:17]<=11;
4'd7:c[20:17]<=6;
4'd8:c[20:17]<=8;
4'd9:c[20:17]<=5;
4'd10:c[20:17]<=3;
4'd11:c[20:17]<=15;
4'd12:c[20:17]<=13;
4'd13:c[20:17]<=0;
4'd14:c[20:17]<=14;
4'd15:c[20:17]<=9;
default:c[20:17]<=0;
endcase
2'd1:
case({b[29],b[28],b[27],b[26]})
4'd0:c[20:17]<=14;
4'd1:c[20:17]<=11;
4'd2:c[20:17]<=2;
4'd3:c[20:17]<=12;
4'd4:c[20:17]<=4;
4'd5:c[20:17]<=7;
4'd6:c[20:17]<=13;
4'd7:c[20:17]<=1;
4'd8:c[20:17]<=5;
4'd9:c[20:17]<=0;
4'd10:c[20:17]<=15;
4'd11:c[20:17]<=10;
4'd12:c[20:17]<=3;
4'd13:c[20:17]<=9;
4'd14:c[20:17]<=8;
4'd15:c[20:17]<=6;
default:c[20:17]<=0;
endcase
2'd2:
case({b[29],b[28],b[27],b[26]})
4'd0:c[20:17]<=4;
4'd1:c[20:17]<=2;
4'd2:c[20:17]<=1;
4'd3:c[20:17]<=11;
4'd4:c[20:17]<=10;
4'd5:c[20:17]<=13;
4'd6:c[20:17]<=7;
4'd7:c[20:17]<=8;
4'd8:c[20:17]<=15;
4'd9:c[20:17]<=9;
4'd10:c[20:17]<=12;
4'd11:c[20:17]<=5;
4'd12:c[20:17]<=6;
4'd13:c[20:17]<=3;
4'd14:c[20:17]<=0;
4'd15:c[20:17]<=14;
default:c[20:17]<=0;
endcase
2'd3:
case({b[29],b[28],b[27],b[26]})
4'd0:c[20:17]<=11;
4'd1:c[20:17]<=8;
4'd2:c[20:17]<=12;
4'd3:c[20:17]<=7;
4'd4:c[20:17]<=1;
4'd5:c[20:17]<=14;
4'd6:c[20:17]<=2;
4'd7:c[20:17]<=13;
4'd8:c[20:17]<=6;
4'd9:c[20:17]<=15;
4'd10:c[20:17]<=0;
4'd11:c[20:17]<=9;
4'd12:c[20:17]<=10;
4'd13:c[20:17]<=4;
4'd14:c[20:17]<=5;
4'd15:c[20:17]<=3;
default:c[20:17]<=0;
endcase
default:c[20:17]<=0;
endcase
case({b[36],b[31]})/*第六个S盒*/
2'd0:
case({b[29],b[28],b[27],b[26]})
4'd0:c[24:21]<=12;
4'd1:c[24:21]<=1;
4'd2:c[24:21]<=10;
4'd3:c[24:21]<=15;
4'd4:c[24:21]<=9;
4'd5:c[24:21]<=2;
4'd6:c[24:21]<=6;
4'd7:c[24:21]<=8;
4'd8:c[24:21]<=0;
4'd9:c[24:21]<=13;
4'd10:c[24:21]<=3;
4'd11:c[24:21]<=4;
4'd12:c[24:21]<=14;
4'd13:c[24:21]<=7;
4'd14:c[24:21]<=5;
4'd15:c[24:21]<=11;
default:c[24:21]<=0;
endcase
2'd1:
case({b[29],b[28],b[27],b[26]})
4'd0:c[24:21]<=10;
4'd1:c[24:21]<=15;
4'd2:c[24:21]<=4;
4'd3:c[24:21]<=2;
4'd4:c[24:21]<=7;
4'd5:c[24:21]<=12;
4'd6:c[24:21]<=9;
4'd7:c[24:21]<=5;
4'd8:c[24:21]<=6;
4'd9:c[24:21]<=1;
4'd10:c[24:21]<=13;
4'd11:c[24:21]<=14;
4'd12:c[24:21]<=0;
4'd13:c[24:21]<=11;
4'd14:c[24:21]<=3;
4'd15:c[24:21]<=8;
default:c[24:21]<=0;
endcase
2'd2:
case({b[29],b[28],b[27],b[26]})
4'd0:c[24:21]<=9;
4'd1:c[24:21]<=14;
4'd2:c[24:21]<=15;
4'd3:c[24:21]<=5;
4'd4:c[24:21]<=2;
4'd5:c[24:21]<=8;
4'd6:c[24:21]<=12;
4'd7:c[24:21]<=3;
4'd8:c[24:21]<=7;
4'd9:c[24:21]<=0;
4'd10:c[24:21]<=4;
4'd11:c[24:21]<=10;
4'd12:c[24:21]<=1;
4'd13:c[24:21]<=13;
4'd14:c[24:21]<=11;
4'd15:c[24:21]<=6;
default:c[24:21]<=0;
endcase
2'd3:
case({b[29],b[28],b[27],b[26]})
4'd0:c[24:21]<=4;
4'd1:c[24:21]<=3;
4'd2:c[24:21]<=2;
4'd3:c[24:21]<=12;
4'd4:c[24:21]<=9;
4'd5:c[24:21]<=5;
4'd6:c[24:21]<=15;
4'd7:c[24:21]<=10;
4'd8:c[24:21]<=11;
4'd9:c[24:21]<=14;
4'd10:c[24:21]<=1;
4'd11:c[24:21]<=7;
4'd12:c[24:21]<=6;
4'd13:c[24:21]<=0;
4'd14:c[24:21]<=8;
4'd15:c[24:21]<=13;
default:c[24:21]<=0;
endcase
default:c[24:21]<=0;
endcase
case({b[36],b[31]})/*第七个S盒*/
2'b0:
case({b[41],b[40],b[39],b[38]})
4'd0:c[28:25]<=4;
4'd1:c[28:25]<=11;
4'd2:c[28:25]<=2;
4'd3:c[28:25]<=14;
4'd4:c[28:25]<=15;
4'd5:c[28:25]<=0;
4'd6:c[28:25]<=8;
4'd7:c[28:25]<=13;
4'd8:c[28:25]<=3;
4'd9:c[28:25]<=12;
4'd10:c[28:25]<=9;
4'd11:c[28:25]<=7;
4'd12:c[28:25]<=5;
4'd13:c[28:25]<=10;
4'd14:c[28:25]<=6;
4'd15:c[28:25]<=1;
default:c[28:25]<=0;
endcase
2'b1:
case({b[41],b[40],b[39],b[38]})
4'd0:c[28:25]<=13;
4'd1:c[28:25]<=0;
4'd2:c[28:25]<=11;
4'd3:c[28:25]<=7;
4'd4:c[28:25]<=4;
4'd5:c[28:25]<=9;
4'd6:c[28:25]<=1;
4'd7:c[28:25]<=10;
4'd8:c[28:25]<=14;
4'd9:c[28:25]<=3;
4'd10:c[28:25]<=5;
4'd11:c[28:25]<=12;
4'd12:c[28:25]<=2;
4'd13:c[28:25]<=15;
4'd14:c[28:25]<=8;
4'd15:c[28:25]<=6;
default:c[28:25]<=0;
endcase
2'b2:
case({b[41],b[40],b[39],b[38]})
4'd0:c[28:25]<=1;
4'd1:c[28:25]<=4;
4'd2:c[28:25]<=11;
4'd3:c[28:25]<=13;
4'd4:c[28:25]<=12;
4'd5:c[28:25]<=3;
4'd6:c[28:25]<=7;
4'd7:c[28:25]<=14;
4'd8:c[28:25]<=10;
4'd9:c[28:25]<=15;
4'd10:c[28:25]<=6;
4'd11:c[28:25]<=8;
4'd12:c[28:25]<=0;
4'd13:c[28:25]<=5;
4'd14:c[28:25]<=9;
4'd15:c[28:25]<=2;
default:c[28:25]<=0;
endcase
2'b3:
case({b[41],b[40],b[39],b[38]})
4'd0:c[28:25]<=6;
4'd1:c[28:25]<=11;
4'd2:c[28:25]<=13;
4'd3:c[28:25]<=8;
4'd4:c[28:25]<=1;
4'd5:c[28:25]<=4;
4'd6:c[28:25]<=10;
4'd7:c[28:25]<=7;
4'd8:c[28:25]<=9;
4'd9:c[28:25]<=5;
4'd10:c[28:25]<=0;
4'd11:c[28:25]<=15;
4'd12:c[28:25]<=14;
4'd13:c[28:25]<=2;
4'd14:c[28:25]<=3;
4'd15:c[28:25]<=12;
default:c[28:25]<=0;
endcase
default:c[28:25]<=0;
endcase
case({b[48],b[43]})/*第八个S盒*/
2'b0:
case({b[47],b[46],b[45],b[44]})
4'd0:c[32:29]<=13;
4'd1:c[32:29]<=2;
4'd2:c[32:29]<=8;
4'd3:c[32:29]<=4;
4'd4:c[32:29]<=6;
4'd5:c[32:29]<=15;
4'd6:c[32:29]<=11;
4'd7:c[32:29]<=1;
4'd8:c[32:29]<=10;
4'd9:c[32:29]<=9;
4'd10:c[32:29]<=3;
4'd11:c[32:29]<=14;
4'd12:c[32:29]<=5;
4'd13:c[32:29]<=0;
4'd14:c[32:29]<=12;
4'd15:c[32:29]<=7;
default:c[32:29]<=0;
endcase
2'b1:
case({b[47],b[46],b[45],b[44]})
4'd0:c[32:29]<=1;
4'd1:c[32:29]<=15;
4'd2:c[32:29]<=13;
4'd3:c[32:29]<=8;
4'd4:c[32:29]<=10;
4'd5:c[32:29]<=3;
4'd6:c[32:29]<=7;
4'd7:c[32:29]<=4;
4'd8:c[32:29]<=12;
4'd9:c[32:29]<=5;
4'd10:c[32:29]<=6;
4'd11:c[32:29]<=11;
4'd12:c[32:29]<=0;
4'd13:c[32:29]<=14;
4'd14:c[32:29]<=9;
4'd15:c[32:29]<=2;
default:c[32:29]<=0;
endcase
2'b2:
case({b[47],b[46],b[45],b[44]})
4'd0:c[32:29]<=7;
4'd1:c[32:29]<=11;
4'd2:c[32:29]<=4;
4'd3:c[32:29]<=1;
4'd4:c[32:29]<=9;
4'd5:c[32:29]<=12;
4'd6:c[32:29]<=14;
4'd7:c[32:29]<=2;
4'd8:c[32:29]<=0;
4'd9:c[32:29]<=6;
4'd10:c[32:29]<=10;
4'd11:c[32:29]<=13;
4'd12:c[32:29]<=15;
4'd13:c[32:29]<=3;
4'd14:c[32:29]<=5;
4'd15:c[32:29]<=8;
default:c[32:29]<=0;
endcase
2'b3:
case({b[47],b[46],b[45],b[44]})
4'd0:c[32:29]<=2;
4'd1:c[32:29]<=1;
4'd2:c[32:29]<=14;
4'd3:c[32:29]<=7;
4'd4:c[32:29]<=4;
4'd5:c[32:29]<=10;
4'd6:c[32:29]<=8;
4'd7:c[32:29]<=13;
4'd8:c[32:29]<=12;
4'd9:c[32:29]<=15;
4'd10:c[32:29]<=9;
4'd11:c[32:29]<=0;
4'd12:c[32:29]<=3;
4'd13:c[32:29]<=5;
4'd14:c[32:29]<=6;
4'd15:c[32:29]<=11;
default:c[32:29]<=0;
endcase
default:c[32:29]<=0;
endcase
default:c[32:29]<=6;
endcase
end
end
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