See also: Serial receiver
Now that you have a finite state machine that can identify when bytes are correctly received in a serial bitstream, add a datapath that will output the correctly-received data byte. out_byte needs to be valid when done is 1, and is don't-care otherwise.
Note that the serial protocol sends the least significant bit first.
Some timing diagrams
module top_module( input clk, input in, input reset, // Synchronous reset output [7:0] out_byte, output done );
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