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https://opencores.org/ocsvn/viterbi_decoder_axi4s/viterbi_decoder_axi4s/trunk
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-- This function calculates the initialization values for trellis metrics.
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-- This function calculates the initialization values for trellis metrics.
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-- The values are used as a constant and written to the ACS unit, every time a new block arrives.
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-- The values are used as a constant and written to the ACS unit, every time a new block arrives.
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--
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--
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function calc_initialize return t_node_s;
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function calc_initialize return t_node_s;
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constant PREVIOUS_STATES : t_previous_states := calc_previous_states;
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constant PREVIOUS_STATES : t_previous_states;
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constant TRANSITIONS : t_transitions := calc_transitions;
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constant TRANSITIONS : t_transitions;
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constant INITIALIZE_TRELLIS : t_node_s := calc_initialize;
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constant INITIALIZE_TRELLIS : t_node_s;
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end package pkg_trellis;
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end package pkg_trellis;
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package body pkg_trellis is
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package body pkg_trellis is
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v_initialize(i) := to_signed(- 2 ** (BW_MAX_PROBABILITY - 2), BW_MAX_PROBABILITY);
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v_initialize(i) := to_signed(- 2 ** (BW_MAX_PROBABILITY - 2), BW_MAX_PROBABILITY);
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end loop;
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end loop;
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return v_initialize;
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return v_initialize;
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end function calc_initialize;
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end function calc_initialize;
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constant PREVIOUS_STATES : t_previous_states := calc_previous_states;
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constant TRANSITIONS : t_transitions := calc_transitions;
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constant INITIALIZE_TRELLIS : t_node_s := calc_initialize;
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end package body pkg_trellis;
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end package body pkg_trellis;
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