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`timescale 1ns/10ps
module IOTDF( clk, rst, in_en, iot_in, fn_sel, busy, valid, iot_out);
input          clk;
input          rst;
input          in_en;
input  [7:0]   iot_in;
input  [2:0]   fn_sel;
output reg busy;
output reg valid;
output reg [127:0] iot_out;
reg [127:0] out_reg, round_reg, sum_reg, mux4, mux5;
wire co_in, co_ro, co_to;
wire [127:0] mxmn_wire1, mxmn_wire2, sum, out4, out5, tol_in;
reg128 input_reg(iot_in, clk, in_en,rst, tol_in);
counter counting(clk, rst, co_in, co_ro, co_to);
//Max&Min
maxmin_sel mxmn_sel1(tol_in, round_reg, co_ro, fn_sel, mxmn_wire1);
//PeakMax&PeakMin
maxmin_sel mxmn_sel2(outFF12, out_reg, co_to, fn_sel, mxmn_wire2);
//Average
adder add1(tol_in, sum_reg, sum);
//Exclude&Extract
ext_bool ext(tol_in, out4);
exc_bool exc(tol_in, out5);


always@(*)begin
case(fn_sel)
 3'b1:begin
 iot_out<= round_reg;
 valid <= 1'b1;
 //Max
 end
 3'b010:begin
 iot_out<= round_reg;
 valid <= 1'b1;
 //Min
 end
 3'b011:begin
 iot_out<= sum_reg;
 valid <= 1'b1;
 //Average
 end
 3'b100:begin
 iot_out<= mux4;
 valid <= 1'b1;
 //Extract //checked
 end
 3'b101:begin
 iot_out<= mux5;
 valid <= 1'b1;
 //Exclude //checked
 end
 3'b110:begin
 iot_out<= out_reg;
 valid <= 1'b1;
 //Peak Max
 end
 3'b111:begin
 iot_out<= out_reg;
 valid <= 1'b1;
 //Peak Min
 end
 default:begin
 iot_out<=128'b0;
 end
endcase
end


//DFF
always@(posedge clk)begin
if(rst)begin
 busy <= 1'b0;
 end
else if (((fn_sel == 3'b001)&&(co_ro))|| ((fn_sel == 3'b010)&&(co_ro))|| ((fn_sel == 3'b011)&&(co_ro))|| ((fn_sel == 3'b100)&&(co_in))|| ((fn_sel == 3'b101)&&(co_in))|| ((fn_sel == 3'b110)&&(co_to))|| ((fn_sel == 3'b111)&&(co_to))) begin
 busy <= 1'b1;
 end
else begin
 busy <= 1'b0;
 end
end
always@(posedge co_in)begin
 round_reg<= mxmn_wire1;
 sum_reg<=sum;
 mux4<=out4;
 mux5<=out5;
 end
always@(posedge co_ro)begin
 out_reg<= mxmn_wire2;
 sum_reg<= {3'b000, sum_reg[127:3]};
 end

  
endmodule

module reg128(cycle_in, clock, enable, rst, in);
input [7:0] cycle_in;
input clock, rst, enable;
output reg [127:0] in;
reg [127:0] current_in;
reg [3:0] count;

always@(posedge clock)begin
 if(rst|(!enable))begin
  in<= 128'b0;
  current_in<= 128'b0;
  count<=3'b0;
  end
 else if (count==4'd15)begin
  in<=current_in;
  end
 else begin
  current_in<={current_in[119:0], cycle_in};
  count<=count+1;
  end
end 
endmodule

module counter(clock, reset, count16, count128, count1536);
input clock, reset;
output reg count16, count128, count1536;
reg [10:0] count;

always@(*)begin
if((count[3:0]==4'd0)&& (count[6:0]!=7'd0)&& (count!=11'b11000000000)) begin
 count1536<=1'b0;
 count128<=1'b0;
 count16<=1'b1;
 end
else if ((count[3:0]==4'd0)&& (count[6:0]==7'd0)&& (count!=11'b11000000000)) begin
 count1536<=1'b0;
 count128<=1'b1;
 count16<=1'b1;
 end
else if ((count[3:0]==4'd0)&& (count[6:0]==7'd0)&& (count==11'b11000000000)) begin
 count1536<=1'b1;
 count128<=1'b1;
 count16<=1'b1;
 end
else begin
 count1536<=1'b0;
 count128<=1'b0;
 count16<=1'b0;
 end
end
always@(posedge clock)
 if(reset||(count==11'b11000000000))
  count<=11'b1;
 else
  count<=count+1;
endmodule

module comparator_notsmaller(in1, in2, notsmaller);
input [127:0] in1, in2;
output reg notsmaller;
always@(*)
 notsmaller<=(in1>=in2);
endmodule

module maxmin_sel(totalin, roundreg, round_rst, fnsel, mux_wire);
input round_rst;
input [127:0] totalin, roundreg;
input [2:0] fnsel;
output reg [127:0] mux_wire;
reg mmsel;
wire cmp;
comparator_notsmaller cmp0(totalin, roundreg, cmp);
always@(*)begin
 mmsel<=(((!cmp)&fnsel[1]&fnsel[0])|((!cmp)&(!fnsel[2])&fnsel[1])|(cmp&fnsel[2]&(!fnsel[0]))|(cmp&(!fnsel[1])));
 if(mmsel||round_rst)
  mux_wire<= totalin;
 else
  mux_wire<= roundreg;
end
endmodule 

module ext_bool(in4, out4);
input [127:0] in4;
output reg [127:0] out4;

always@(*)begin
 if ((in4[127]&(!in4[126])&(!in4[125]))|(!in4[127])&in4[126]&in4[125]&in4[124])
  out4<= in4;
 else
  out4<= 128'b0;
end
endmodule

module exc_bool(in5, out5);
input [127:0] in5;
output reg [127:0] out5;

always@(*)begin
if((in5[127]&in5[126])|((!in5[127])&(!in5[126]))|(in5[126]&(!in5[124]))|(in5[126]&(!in5[125])))
  out5<= in5;
 else
  out5<= 128'b0;
end
endmodule


module adder(inreg, sumreg, sum);
input [127:0] inreg, sumreg;
output reg [127:0] sum;
always@(*)
 sum<= inreg+ sumreg;

endmodule




//ncverilog IOTDF1.v -c
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