Hi all,
I have done a simple coding regarding my assignment but some error arise.
Can anyone tell me the problem
module parking (Remaining_spaces,G1,G2,E1,E2,clk,rst_n);
output Remaining_spaces;
input G1,G2,E1,E2;
input clk, rst_n;
parameter [2:0] IDLE = 3'b000,
DETECT = 3'b001,
FIND_IN = 3'b010,
FIND_OUT = 3'b011,
CHECK_IN = 3'b100,
CHECK_OUT= 3'b101;
reg [2:0] state, next;
always @ (posedge clk or negedge rst_n)
if (!rst_n) state <= IDLE;
else state <= next;
always @ (state or G1 or G2 or E1 or E2) begin
next = 3'bx;
case(state)
IDLE: begin
next = DETECT; // jump to the next state
end
DETECT : begin
if (G1 == 1'b1) begin
next = FIND_IN;
G1 = 1'b0;
end else if (G2 == 1'b1) begin
next = FIND_IN;
G2 = 1'b0;
end else if (E1 == 1'b1) begin
next = FIND_OUT;
E1 = 1'b0;
end else if (E2 == 1'b1) begin
next = FIND_OUT;
E2 = 1'b0;
end else begin
next = DETECT;
end
end
FIND_IN : begin
next = CHECK_IN ;
end
FIND_OUT : begin
next = CHECK_OUT ;
end
CHECK_IN: begin
Remaining_spaces = Remaining_spaces - 1;
end
CHECK_OUT: begin
Remaining_spaces = Remaining_spaces + 1;
end
endcase
end
endmodule
