The continuous decoder processes a number of symbols greater than the traceback length. When the decoder traces back the number of bits (traceback length), it delivers output bits. This behavior changes when you assert the end of packet (EOP) signal. The decoder then switches to block decoding, starting traceback from the last symbol or state. The tr_init_state signal indicates the end state that starts the traceback operation. For block decoding Intel recommends you indicate the end state of the tail bits (usually zero) and set the tb_type signal to 1.