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TrafficLights.v
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165 lines (129 loc) · 4.43 KB
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module TrafficLights(light_M1,light_M2,light_MT,light_S,rst,clk,NO_of_vehical);
input [4:0]NO_of_vehical;
input rst;
input clk;
output [2:0] light_M1;
reg [2:0] light_M1;
output [2:0] light_M2;
reg [2:0] light_M2;
output [2:0] light_MT;
reg [2:0] light_MT;
output [2:0] light_S;
reg [2:0] light_S;
parameter S1=0, S2=1, S3 =2, S4=3, S5=4,S6=5;
reg[3:0] count;
reg[2:0] ps;
always@( NO_of_vehical)
begin
if(rst==1)
begin
ps<=S2;
end
else
case(ps)
S1: if(NO_of_vehical== 7)
begin
ps<=S1;
end
else
begin
ps<=S2;
end
S2: if(NO_of_vehical== 2)
begin
ps<=S2;
end
else
begin
ps<=S3;
end
S3: if(NO_of_vehical== 5)
begin
ps<=S3;
end
else
begin
ps<=S4;
end
S4:if(NO_of_vehical== 4)
begin
ps<=S4;
end
else
begin
ps<=S5;
end
S5:if(NO_of_vehical== 3)
begin
ps<=S5;
end
else
begin
ps<=S6;
end
S6:if(NO_of_vehical== 6)
begin
ps<=S6;
end
else
begin
ps<=S1;
end
default: ps<=S1;
endcase
end
always@(ps)
begin
case(ps)
S1:
begin
light_M1<=3'b001;
light_M2<=3'b001;
light_MT<=3'b100;
light_S<=3'b100;
end
S2:
begin
light_M1<=3'b001;
light_M2<=3'b010;
light_MT<=3'b100;
light_S<=3'b100;
end
S3:
begin
light_M1<=3'b001;
light_M2<=3'b100;
light_MT<=3'b001;
light_S<=3'b100;
end
S4:
begin
light_M1<=3'b010;
light_M2<=3'b100;
light_MT<=3'b010;
light_S<=3'b100;
end
S5:
begin
light_M1<=3'b100;
light_M2<=3'b100;
light_MT<=3'b100;
light_S<=3'b001;
end
S6:
begin
light_M1<=3'b100;
light_M2<=3'b100;
light_MT<=3'b100;
light_S<=3'b010;
end
default:
begin
light_M1<=3'b000;
light_M2<=3'b000;
light_MT<=3'b000;
light_S<=3'b000;
end
endcase
end
endmodule