top_ad_conv_RHF1401_withFilter.vhd
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| 6.7 KiB
| text/x-vhdl
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r400 | |||
LIBRARY IEEE; | ||||
USE IEEE.STD_LOGIC_1164.ALL; | ||||
USE IEEE.numeric_std.ALL; | ||||
LIBRARY lpp; | ||||
USE lpp.lpp_ad_conv.ALL; | ||||
USE lpp.general_purpose.SYNC_FF; | ||||
ENTITY top_ad_conv_RHF1401_withFilter IS | ||||
GENERIC( | ||||
ChanelCount : INTEGER := 8; | ||||
ncycle_cnv_high : INTEGER := 13; | ||||
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r499 | ncycle_cnv : INTEGER := 25; | ||
FILTER_ENABLED : INTEGER := 16#FF# | ||||
); | ||||
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r400 | PORT ( | ||
cnv_clk : IN STD_LOGIC; -- 24Mhz | ||||
cnv_rstn : IN STD_LOGIC; | ||||
cnv : OUT STD_LOGIC; | ||||
clk : IN STD_LOGIC; -- 25MHz | ||||
rstn : IN STD_LOGIC; | ||||
ADC_data : IN Samples14; | ||||
ADC_nOE : OUT STD_LOGIC_VECTOR(ChanelCount-1 DOWNTO 0); | ||||
sample : OUT Samples14v(ChanelCount-1 DOWNTO 0); | ||||
sample_val : OUT STD_LOGIC | ||||
); | ||||
END top_ad_conv_RHF1401_withFilter; | ||||
ARCHITECTURE ar_top_ad_conv_RHF1401 OF top_ad_conv_RHF1401_withFilter IS | ||||
SIGNAL cnv_cycle_counter : INTEGER; | ||||
SIGNAL cnv_s : STD_LOGIC; | ||||
SIGNAL cnv_sync : STD_LOGIC; | ||||
SIGNAL cnv_sync_pre : STD_LOGIC; | ||||
SIGNAL ADC_nOE_reg : STD_LOGIC_VECTOR(ChanelCount-1 DOWNTO 0); | ||||
SIGNAL enable_ADC : STD_LOGIC; | ||||
SIGNAL sample_reg : Samples14v(ChanelCount-1 DOWNTO 0); | ||||
SIGNAL channel_counter : INTEGER; | ||||
CONSTANT MAX_COUNTER : INTEGER := ChanelCount*2+1; | ||||
SIGNAL ADC_data_selected : Samples14; | ||||
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r420 | SIGNAL ADC_data_result : Samples15; | ||
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r400 | |||
SIGNAL sample_counter : INTEGER; | ||||
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r499 | CONSTANT MAX_SAMPLE_COUNTER : INTEGER := 9; | ||
CONSTANT FILTER_ENABLED_STDLOGIC : STD_LOGIC_VECTOR(ChanelCount-1 DOWNTO 0) := STD_LOGIC_VECTOR(to_unsigned(FILTER_ENABLED,ChanelCount)); | ||||
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BEGIN | ||||
----------------------------------------------------------------------------- | ||||
-- CNV GEN | ||||
----------------------------------------------------------------------------- | ||||
PROCESS (cnv_clk, cnv_rstn) | ||||
BEGIN -- PROCESS | ||||
IF cnv_rstn = '0' THEN -- asynchronous reset (active low) | ||||
cnv_cycle_counter <= 0; | ||||
cnv_s <= '0'; | ||||
ELSIF cnv_clk'EVENT AND cnv_clk = '1' THEN -- rising clock edge | ||||
IF cnv_cycle_counter < ncycle_cnv-1 THEN | ||||
cnv_cycle_counter <= cnv_cycle_counter + 1; | ||||
IF cnv_cycle_counter < ncycle_cnv_high THEN | ||||
cnv_s <= '1'; | ||||
ELSE | ||||
cnv_s <= '0'; | ||||
END IF; | ||||
ELSE | ||||
cnv_s <= '1'; | ||||
cnv_cycle_counter <= 0; | ||||
END IF; | ||||
END IF; | ||||
END PROCESS; | ||||
cnv <= cnv_s; | ||||
----------------------------------------------------------------------------- | ||||
-- SYNC CNV | ||||
----------------------------------------------------------------------------- | ||||
SYNC_FF_cnv : SYNC_FF | ||||
GENERIC MAP ( | ||||
NB_FF_OF_SYNC => 2) | ||||
PORT MAP ( | ||||
clk => clk, | ||||
rstn => rstn, | ||||
A => cnv_s, | ||||
A_sync => cnv_sync); | ||||
----------------------------------------------------------------------------- | ||||
-- DATA GEN Output Enable | ||||
----------------------------------------------------------------------------- | ||||
PROCESS (clk, rstn) | ||||
BEGIN -- PROCESS | ||||
IF rstn = '0' THEN -- asynchronous reset (active low) | ||||
ADC_nOE_reg(ChanelCount-1 DOWNTO 0) <= (OTHERS => '1'); | ||||
cnv_sync_pre <= '0'; | ||||
enable_ADC <= '0'; | ||||
ELSIF clk'event AND clk = '1' THEN -- rising clock edge | ||||
cnv_sync_pre <= cnv_sync; | ||||
IF cnv_sync = '1' AND cnv_sync_pre = '0' THEN | ||||
enable_ADC <= '1'; | ||||
ADC_nOE_reg(0) <= '0'; | ||||
ADC_nOE_reg(ChanelCount-1 DOWNTO 1) <= (OTHERS => '1'); | ||||
ELSE | ||||
enable_ADC <= NOT enable_ADC; | ||||
IF enable_ADC = '0' THEN | ||||
ADC_nOE_reg(ChanelCount-1 DOWNTO 0) <= ADC_nOE_reg(ChanelCount-2 DOWNTO 0) & '1'; | ||||
END IF; | ||||
END IF; | ||||
END IF; | ||||
END PROCESS; | ||||
ADC_nOE <= (OTHERS => '1') WHEN enable_ADC = '0' ELSE ADC_nOE_reg; | ||||
----------------------------------------------------------------------------- | ||||
-- ADC READ DATA | ||||
----------------------------------------------------------------------------- | ||||
PROCESS (clk, rstn) | ||||
BEGIN -- PROCESS | ||||
IF rstn = '0' THEN -- asynchronous reset (active low) | ||||
channel_counter <= MAX_COUNTER; | ||||
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r499 | all_sample_reg_init: FOR I IN ChanelCount-1 DOWNTO 0 LOOP | ||
sample_reg(I) <= (OTHERS => '0'); | ||||
END LOOP all_sample_reg_init; | ||||
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r400 | sample_val <= '0'; | ||
sample_counter <= 0; | ||||
ELSIF clk'event AND clk = '1' THEN -- rising clock edge | ||||
IF cnv_sync = '1' AND cnv_sync_pre = '0' THEN | ||||
channel_counter <= 0; | ||||
ELSE | ||||
IF channel_counter < MAX_COUNTER THEN | ||||
channel_counter <= channel_counter + 1; | ||||
END IF; | ||||
END IF; | ||||
sample_val <= '0'; | ||||
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r499 | all_sample_reg: FOR I IN ChanelCount-1 DOWNTO 0 LOOP | ||
IF channel_counter = I*2 THEN | ||||
IF FILTER_ENABLED_STDLOGIC(I) = '1' THEN | ||||
sample_reg(I) <= ADC_data_result(14 DOWNTO 1); | ||||
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r400 | ELSE | ||
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r499 | sample_reg(I) <= ADC_data; | ||
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r400 | END IF; | ||
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r499 | END IF; | ||
END LOOP all_sample_reg; | ||||
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r400 | |||
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r499 | IF channel_counter = (ChanelCount-1)*2 THEN | ||
IF sample_counter = MAX_SAMPLE_COUNTER THEN | ||||
sample_counter <= 0 ; | ||||
sample_val <= '1'; | ||||
ELSE | ||||
sample_counter <= sample_counter +1; | ||||
END IF; | ||||
END IF; | ||||
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r400 | END IF; | ||
END PROCESS; | ||||
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r499 | -- mux_adc: PROCESS (sample_reg)-- (channel_counter, sample_reg) | ||
-- BEGIN -- PROCESS mux_adc | ||||
-- CASE channel_counter IS | ||||
-- WHEN OTHERS => ADC_data_selected <= sample_reg(channel_counter/2); | ||||
-- END CASE; | ||||
-- END PROCESS mux_adc; | ||||
----------------------------------------------------------------------------- | ||||
-- \/\/\/\/\/\/\/ TODO : this part is not GENERIC !!! \/\/\/\/\/\/\/ | ||||
----------------------------------------------------------------------------- | ||||
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r400 | |||
WITH channel_counter SELECT | ||||
ADC_data_selected <= sample_reg(0) WHEN 0*2, | ||||
sample_reg(1) WHEN 1*2, | ||||
sample_reg(2) WHEN 2*2, | ||||
sample_reg(3) WHEN 3*2, | ||||
sample_reg(4) WHEN 4*2, | ||||
sample_reg(5) WHEN 5*2, | ||||
sample_reg(6) WHEN 6*2, | ||||
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r499 | sample_reg(7) WHEN 7*2, | ||
sample_reg(8) WHEN OTHERS ; | ||||
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r400 | |||
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r499 | ----------------------------------------------------------------------------- | ||
-- /\/\/\/\/\/\/\ ----------------------------------- /\/\/\/\/\/\/\ | ||||
----------------------------------------------------------------------------- | ||||
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r400 | |||
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r420 | ADC_data_result <= std_logic_vector( (signed( ADC_data_selected(13) & ADC_data_selected) + signed( ADC_data(13) & ADC_data)) ); | ||
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r400 | |||
sample <= sample_reg; | ||||
END ar_top_ad_conv_RHF1401; | ||||