[[MenuBar]]
* miniCPUの出力をI2C操作のための信号線に接続。 [#f9b2abaa]
 module top(sSegAnode, sSegCathode, sw, ledOut, colorLed_1, colorLed_2,
  bu, bd, bl, br, bc, scl, sda, 
  bclck
     ); 
   output [7:0] sSegAnode;
   output [7:0] sSegCathode;
   output [15:0] ledOut;                  // led[8] ... if sda is sending, corresponding to the last sended sda, 
                                                     //else corresponding to the last received sda
                                       //               it is shifted to left when a positive edge of scl is detected.
 												  //  led[0] corresponding to sw[0]
 												  //  led[1] corresponding to sw[1]
 												  //  led[2] corresponsing to center button, bc.
   output [2:0] colorLed_1;
   output [2:0] colorLed_2;          // color LED 
   input [15:0] sw;                    // sw[15:8] ... for setting sda send data, sw[7:0] ... for controlling
                                       //    sw[0] ... if 1 scl is not ready, else scl is ready;
 												  //    sw[1] ... if 1 sda is receiving(1), else sda is sending(0).
 												  //    sw[2] ... sending sda.
             												  
   input bu, bd, bl, br, bc, bclck;    //  bd corresponding to !reset.
                                       //  bc corresponding to scl.  scl=sw[0]|bc
 												  //  if posedge bl is detected, sw is shown in hex in the 7seg led array.
   
   inout scl, sda;
   reg sclx, sdax;
   
   assign scl=(~sclx)?1'b0:1'bz;
   assign sda=(~sdax)?1'b0:1'bz;
   
   wire BNx, BWx, BEx, BCx;
   // reset: BSx
   // BWx, BEx ... change operationMode
   // 
   wire [15:0] swx;
   wire reset;
 //  reg sclRw, sdaRw; // write=1, read=0;
   reg cpuClk,cpuRun;
   reg [7:0] data;
   reg [1:0] operationMode;
   // operationMode: 0 ... manual operation of peripherals
   //                1 ... CPU independent
   //                2 ... CPU, I2C connected
   reg [15:0] ledWire,cpuIn;
   wire [2:0] cpuCs;
   wire [11:0] pcout,abus;
   wire [15:0] irout,qtop,dbus,out;
   reg [31:0] sSegArray;
   reg [15:0] led;
   assign ledOut=led;
   
   reg [2:0] colorLed_1x, colorLed_2x;
 //  
   assign colorLed_1=colorLed_1x;
   assign colorLed_2=colorLed_2x;
   
   assign reset=~bd;
   
 //  always @(sclx or sdax ) begin
 //    colorLed_2x[0]<=sclx;
 //    colorLed_2x[1]<=sdax;
 //    colorLed_2x[2]<=0;
 //  end
   
   always @(posedge sclx, negedge reset) begin
     if(!reset) begin
     	 data<=0; 
 	 end
 	 else
     data<={data[6:0],sda};
   end
   
   // for operation mode
   always @(posedge BEx or posedge BWx or negedge reset) begin
      if(!reset) begin
 	    operationMode<=0;
 //		 colorLed_2x[0]<=0;
 //		 colorLed_2x[1]<=0;
 //		 colorLed_2x[2]<=0;
 
 //		 sclRw<=0;
 //		 sdaRw<=0;
 	  end
 	  else
 	  if(BEx) operationMode<=operationMode+1;
 	  else
 	  if(BWx) operationMode<=operationMode-1;
   end
   
 //  always @(operationMode or swx[0] or BCx or data or BNx or cpuCs or out or sda or scl or out[0] or out[1]) begin
   always @(operationMode) begin
      case(operationMode)
       0: begin 
 		     colorLed_1x=3'b000;
 			  cpuClk=0; cpuRun=0; cpuIn=0;
 			  sSegArray={{16{0}},data,swx[7:0]};
 			  led[15:8]=data;
            led[7:0]=swx[7:0];
            sclx=BCx;
 			  sdax=swx[0];
 			  colorLed_2x={0,sda,scl};
 			end
 		1: begin // CPU independent, 
 		     colorLed_1x=3'b001;
 			  cpuClk=BCx; cpuRun=BNx; cpuIn=swx; 
 			  sSegArray={{0},cpuCs,pcout,irout};
 			  led={{0{16}},out};
 			  sclx=1'b1;
 			  sdax=1'b1;
 			  colorLed_2x={0,sda,scl};
 		   end
 		2: begin
 		     colorLed_1x=3'b010;
 			  cpuClk=BCx; cpuRun=BNx; cpuIn={{8{0}},data}; 
 			  sSegArray={{0},cpuCs,abus,dbus};
 			  led[15:8]=data;
            led[7:0]=out[7:0];
            sclx=out[0];
 			  sdax=out[1];
 			  colorLed_2x={0,sda,scl};
 		   end
 		default begin
 		     colorLed_1x=3'b011;
 			  cpuClk=BCx; cpuRun=BNx; cpuIn=swx; 
 			  sSegArray={{0{16}},data,swx[7:0]};
 			  led[15:8]=data;
            led[7:0]=swx[7:0];
            sclx=BCx;
 			  sdax=swx[0];
 			  colorLed_2x={0,sda,scl};
 		end
 	  endcase
   end
   
   chattering #(20) chattering0(.clk(bclck), .reset(reset), .in({bu,bl,br,bc,sw}), .out({BNx,  BWx, BEx, BCx,swx}));
 //  assign BNx=bu;
 //  assign BWx=bl;
 //  assign BEx=br;
 //  assign BCx=bc;
 //  assign swx=sw;
 
 
   sSegArray sSegArray0(.clk(bclck), .reset(reset), .load(1), .d(sSegArray), .anode(sSegAnode), .cathode(sSegCathode));
   
   minicpu minicpu0(.clk(cpuClk), .reset(reset), .run(cpuRun), .in(cpuIn), .cs(cpuCs), .pcout(pcout), .irout(irout), .qtop(qtop), .abus(abus), .dbus(dbus), .out(out));
   
 endmodule
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