module BCD9999(SW, LEDR, LEDG , CLOCK_50 ,KEY ,HEX0 ,HEX1 ,HEX2,HEX3 );
input [17:0] SW; // toggle switches
input [7:0] KEY; // Push bottom
input CLOCK_50; //Clock 27MHz , 50Mhz
output [17:0] LEDR; // red LEDS
output [8:0] LEDG; // green LEDs
output [6:0] HEX0,HEX1,HEX2,HEX3; //7-segment display
//set original program input , output
//(clr,clk,q);
//input clr,clk;
//output [15:0]q;
wire clr,clk;
reg [15:0]q;
wire HZ_1; //1HZ Clock
assign clr=KEY[0];
assign clk=CLOCK_50;
wire [7:0] segout0; //HEX 0
wire [7:0] segout1; //HEX 1
wire [7:0] segout2; //HEX 1
wire [7:0] segout3; //HEX 1
//module _1HZ (CLK, RSTn, LED_Out);
_1HZ UUT01 (.CLK(clk),
.RSTn(clr),
.LED_Out(HZ_1));
always @(posedge HZ_1 or negedge clr)
begin
if(!clr) q[15:0]=0;
else if(q[15:0]==16'H9999) q[15:0]=0;
else if(q[11:0]==12'H999) q[15:0]=q[15:0]+12'H667;
else if(q[ 7:0]== 8'H99) q[15:0]=q[15:0]+8'H67;
else if(q[ 3:0]== 4'H9) q[15:0]=q[15:0]+4'H7;
else q[15:0]=q[15:0]+1;
end
_7seg UUT0(.hex((q[3:0])),
.seg(segout0));
_7seg UUT1(.hex((q[7:4])),
.seg(segout1));
_7seg UUT2(.hex((q[11:8])),
.seg(segout2));
_7seg UUT3(.hex((q[15:12])),
.seg(segout3));
assign HEX0=segout0[6:0];
assign HEX1=segout1[6:0];
assign HEX2=segout2[6:0];
assign HEX3=segout3[6:0];
endmodule
//=======================================
//=======================================
//Clock input 50MHZ
//=======================================
module _1HZ (CLK, RSTn, LED_Out);
input CLK;
input RSTn;
output LED_Out;
/*************************************/
parameter T1S = 26'd50_000_000; //50MHZ
/*************************************/
reg [25:0]Count1;
always @ ( posedge CLK or negedge RSTn )
begin
if( !RSTn )
Count1 <= 26'd0;
else if( Count1 == T1S )
Count1 <= 26'd0;
else
Count1 <= Count1 + 1'b1;
end
/*************************************/
reg rLED_Out;
always @ ( posedge CLK or negedge RSTn )
begin
if( !RSTn )
rLED_Out <= 1'b0;
else if( Count1 >= 26'd0 && Count1 < 26'd25_000_000 )
//0.5sec ON , o.5sec OFF
rLED_Out <= 1'b1;
else
rLED_Out <= 1'b0;
end
/***************************************/
assign LED_Out = rLED_Out;
/***************************************/
endmodule
//-----------------------------------------
//Common-cathod seven segment display
//using case.....endcase statement
//Filename : sevenseg_case.v
//-----------------------------------------
module _7seg(hex , seg);
input [3:0] hex;
output [7:0] seg;
reg [7:0] seg;
// segment encoding
// 0
// ---
// 5 | | 1
// --- <- 6
// 4 | | 2
// ---
// 3
always @(hex)
begin
case (hex)
// Dot point is always disable
4'b0001 : seg = 8'b11111001; //1 = F9H
4'b0010 : seg = 8'b10100100; //2 = A4H
4'b0011 : seg = 8'b10110000; //3 = B0H
4'b0100 : seg = 8'b10011001; //4 = 99H
4'b0101 : seg = 8'b10010010; //5 = 92H
4'b0110 : seg = 8'b10000010; //6 = 82H
4'b0111 : seg = 8'b11111000; //7 = F8H
4'b1000 : seg = 8'b10000000; //8 = 80H
4'b1001 : seg = 8'b10010000; //9 = 90H
4'b1010 : seg = 8'b10001000; //A = 88H
4'b1011 : seg = 8'b10000011; //b = 83H
4'b1100 : seg = 8'b11000110; //C = C6H
4'b1101 : seg = 8'b10100001; //d = A1H
4'b1110 : seg = 8'b10000110; //E = 86H
4'b1111 : seg = 8'b10001110; //F = 8EH
default : seg = 8'b11000000; //0 = C0H
endcase
end
endmodule
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