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132. PS\2 packet parser.v
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132. PS\2 packet parser.v
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module top_module(
input clk,
input [7:0] in,
input reset, // Synchronous reset
output done);
parameter BYTE1 = 1, BYTE2 = 2, BYTE3 = 3, DONE = 4;
reg [2:0] state, next_state;
always @(*) begin
state <= next_state;
end
always @(posedge clk) begin
if(reset)
next_state <= BYTE1;
else
case (state)
BYTE1 : begin
if(in[3] == 1'b0)
next_state <= BYTE1;
else
next_state <= BYTE2;
end
BYTE2 : begin
next_state <= BYTE3;
end
BYTE3 : begin
next_state <= DONE;
end
DONE : begin
if(in[3] == 1'b0)
next_state <= BYTE1;
else
next_state <= BYTE2;
end
default:
next_state <= BYTE1;
endcase
end
assign done = (state == DONE)?1:0;
endmodule