Remove digital debug output signals
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			@ -166,13 +166,6 @@ architecture arch of puzzlefw_top is
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    signal s_dig_deglitch:  std_logic_vector(3 downto 0);
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    signal s_dig_sample:    std_logic_vector(3 downto 0);
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-- TODO
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    signal r_mhz_cnt:      unsigned(7 downto 0);
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    signal r_khz_cnt:      unsigned(9 downto 0);
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    signal r_blink_mhz:    std_logic;
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    signal r_blink_mhz_d:  std_logic;
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    signal r_blink_khz:    std_logic;
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begin
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    -- Drive LEDs.
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			@ -197,38 +190,9 @@ begin
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    dac_pwm_o   <= (others => 'Z');
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    -- Use extension I/O pins as inputs only.
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-- TODO -- temporary test pulse generator
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    exp_p_io    <= (2 => r_blink_khz, 3 => r_blink_khz, 4 => r_blink_mhz, 5 => r_blink_mhz, 6 => r_blink_mhz_d, 7 => r_blink_mhz_d, others => 'Z');
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    exp_p_io    <= (others => 'Z');
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    exp_n_io    <= (others => 'Z');
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-- TODO
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    process (clk_adc) is
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    begin
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        if rising_edge(clk_adc) then
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            if r_mhz_cnt < 124 then
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                r_mhz_cnt <= r_mhz_cnt + 1;
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            else
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                r_mhz_cnt <= (others => '0');
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                if r_khz_cnt < 999 then
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                    r_khz_cnt <= r_khz_cnt + 1;
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                else
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                    r_khz_cnt <= (others => '0');
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                end if;
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            end if;
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            if r_mhz_cnt < 62 then
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                r_blink_mhz <= '0';
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            else
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                r_blink_mhz <= '1';
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            end if;
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            r_blink_mhz_d <= r_blink_mhz;
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            if r_khz_cnt < 500 then
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                r_blink_khz <= '0';
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            else
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                r_blink_khz <= '1';
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            end if;
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        end if;
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    end process;
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    -- Differential clock input for ADC clock.
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    inst_ibuf_adc_clk: IBUFDS
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        port map (
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