module ParkingSlot(clock,reset,enter_car,exit_carA,exit_carB,exit_carC,exit_carD,slot1,slot2,slot3,slot4);
input enter_car,exit_carA,exit_carB,exit_carC,exit_carD,clock,reset;
output slot1,slot2,slot3,slot4;
reg slot1,slot2,slot3,slot4;
initial begin
slot1=1'b1;
slot2=1'b1;
slot3=1'b1;
slot4=1'b1;
end
always@(reset or enter_car or exit_carA or exit_carB or exit_carC or exit_carD or posedge clock)
begin
if(reset==1'b1)
begin
slot1=1'b1;
slot2=1'b1;
slot3=1'b1;
slot4=1'b1;
$display("Reset Pressed");
$display("slot 1 is alloted");
$display("slot 2 is alloted");
$display("slot 3 is alloted");
$display("slot 4 is alloted");
end
else if(enter_car==1'b1)
begin
if(slot1==1'b1) //may nakapark sa slot 1
begin
slot1=1'b0;
$display("slot 1 is alloted");
end
else if(slot2==1'b1) //may nakapark sa slot 2
begin
slot2=1'b0;
$display("slot 2 is alloted");
end
else if(slot3==1'b1) //may nakapark sa slot 3
begin
slot3=1'b0;
$display("slot 3 is alloted");
end
else if(slot4==1'b1) //may nakapark sa slot 4
begin
slot4=1'b0;
$display("slot 4 is alloted");
end
else
$display("slots are full");
end
else if(exit_carA==1'b1)
begin
if(slot1==1'b0)
begin
slot1=1'b1;
$display("slot 1 is dealloted"); //may paalis na slot 1
end
else
$display("No Car in slot 1");
end
else if(exit_carB==1'b1)
begin
if(slot2==1'b0)
begin
slot2=1'b1;
$display("slot 2 is dealloted"); //may paalis na slot 2
end
else
$display("No Car in slot 2");
end
else if(exit_carC==1'b1)
begin
if(slot3==1'b0)
begin
slot3=1'b1;
$display("slot 3 is dealloted"); //may paalis na slot 3
end
else
$display("No Car in slot 3");
end
else if(exit_carD==1'b1)
begin
if(slot4==1'b0)
begin
slot4=1'b1;
$display("slot 4 is dealloted"); //may paalis na slot 4
end
else
$display("No Car in slot 4");
end
end
endmodule
/*module tb_ParkingSlot;
// Inputs
reg clock;
reg reset;
reg slot1,slot2,slot3,slot4;
// Outputs
output slot1,slot2,slot3,slot4;
initial begin
clock = 0;
forever #10 clock = ~clock;
end
endmodule
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