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LIBRARY IEEE;
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USE IEEE.STD_LOGIC_1164.ALL;
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USE ieee.numeric_std.ALL;
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ENTITY lpp_waveform_snapshot_controler IS
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GENERIC (
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delta_snapshot_size : INTEGER := 16;
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delta_f2_f0_size : INTEGER := 10;
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delta_f2_f1_size : INTEGER := 10);
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PORT (
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clk : IN STD_LOGIC;
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rstn : IN STD_LOGIC;
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--config
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delta_snapshot : IN STD_LOGIC_VECTOR(delta_snapshot_size-1 DOWNTO 0);
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delta_f2_f1 : IN STD_LOGIC_VECTOR(delta_f2_f1_size-1 DOWNTO 0);
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delta_f2_f0 : IN STD_LOGIC_VECTOR(delta_f2_f0_size-1 DOWNTO 0);
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--input
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coarse_time_0 : IN STD_LOGIC;
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data_f0_in_valid : IN STD_LOGIC;
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data_f2_in_valid : IN STD_LOGIC;
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--output
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start_snapshot_f0 : OUT STD_LOGIC;
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start_snapshot_f1 : OUT STD_LOGIC;
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start_snapshot_f2 : OUT STD_LOGIC
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);
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END lpp_waveform_snapshot_controler;
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ARCHITECTURE beh OF lpp_waveform_snapshot_controler IS
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SIGNAL counter_delta_snapshot : INTEGER;
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SIGNAL counter_delta_f0 : INTEGER;
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SIGNAL coarse_time_0_r : STD_LOGIC;
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SIGNAL start_snapshot_f2_temp : STD_LOGIC;
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SIGNAL start_snapshot_fothers_temp : STD_LOGIC;
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SIGNAL start_snapshot_fothers_temp2 : STD_LOGIC;
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BEGIN -- beh
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PROCESS (clk, rstn)
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BEGIN
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IF rstn = '0' THEN
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start_snapshot_f0 <= '0';
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start_snapshot_f1 <= '0';
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start_snapshot_f2 <= '0';
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counter_delta_snapshot <= 0;
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counter_delta_f0 <= 0;
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coarse_time_0_r <= '0';
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start_snapshot_f2_temp <= '0';
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start_snapshot_fothers_temp <= '0';
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start_snapshot_fothers_temp2 <= '0';
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ELSIF clk'EVENT AND clk = '1' THEN
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IF counter_delta_snapshot = UNSIGNED(delta_snapshot) THEN
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start_snapshot_f2_temp <= '1';
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ELSE
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start_snapshot_f2_temp <= '0';
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END IF;
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-------------------------------------------------------------------------
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IF counter_delta_snapshot = UNSIGNED(delta_snapshot) AND start_snapshot_f2_temp = '0' THEN
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start_snapshot_f2 <= '1';
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ELSE
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start_snapshot_f2 <= '0';
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END IF;
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-------------------------------------------------------------------------
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coarse_time_0_r <= coarse_time_0;
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IF coarse_time_0 = NOT coarse_time_0_r AND coarse_time_0 = '1' THEN
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IF counter_delta_snapshot = 0 THEN
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counter_delta_snapshot <= to_integer(UNSIGNED(delta_snapshot));
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ELSE
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counter_delta_snapshot <= counter_delta_snapshot - 1;
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END IF;
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END IF;
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-------------------------------------------------------------------------
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IF counter_delta_f0 = UNSIGNED(delta_f2_f1) THEN
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start_snapshot_f1 <= '1';
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ELSE
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start_snapshot_f1 <= '0';
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END IF;
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IF counter_delta_f0 = 1 THEN --UNSIGNED(delta_f2_f0) THEN
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start_snapshot_f0 <= '1';
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ELSE
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start_snapshot_f0 <= '0';
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END IF;
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IF counter_delta_snapshot = UNSIGNED(delta_snapshot)
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AND start_snapshot_f2_temp = '0'
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THEN --
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start_snapshot_fothers_temp <= '1';
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ELSIF counter_delta_f0 > 0 THEN
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start_snapshot_fothers_temp <= '0';
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END IF;
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-------------------------------------------------------------------------
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IF (start_snapshot_fothers_temp = '1' OR (counter_delta_snapshot = UNSIGNED(delta_snapshot) AND start_snapshot_f2_temp = '0')) AND data_f2_in_valid = '1' THEN
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--counter_delta_snapshot = UNSIGNED(delta_snapshot) AND start_snapshot_f2_temp = '0' THEN --
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--counter_delta_snapshot = UNSIGNED(delta_snapshot) THEN
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counter_delta_f0 <= to_integer(UNSIGNED(delta_f2_f0)); --0;
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ELSE
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IF (( counter_delta_f0 > 0 ) AND ( data_f0_in_valid = '1' )) THEN --<= UNSIGNED(delta_f2_f0) THEN
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counter_delta_f0 <= counter_delta_f0 - 1;--counter_delta_f0 + 1;
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END IF;
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END IF;
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-------------------------------------------------------------------------
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END IF;
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END PROCESS;
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END beh;
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