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redpitaya-puzzlefw
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Support ADC sample derandomization

This commit is contained in:
Joris van Rantwijk 2024-10-18 00:20:32 +02:00
parent 80f2b242f2
commit 633d2db548
2 changed files with 19 additions and 2 deletions
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2
fpga/rtl/puzzlefw_pkg.vhd
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@ -96,7 +96,7 @@ package puzzlefw_pkg is
-- Firmware info word.
constant fw_api_version: natural := 1;
constant fw_version_major: natural := 0;
constant fw_version_minor: natural := 16;
constant fw_version_minor: natural := 17;
constant fw_info_word: std_logic_vector(31 downto 0) :=
x"4a"
& std_logic_vector(to_unsigned(fw_api_version, 8))

19
fpga/rtl/puzzlefw_top_4ch.vhd
View File

@ -153,6 +153,7 @@ architecture arch of puzzlefw_top_4ch is
-- Registers.
signal s_reg_control: registers_control;
signal s_reg_status: registers_status;
signal r_derandomize: std_logic;
-- DMA write channel control.
signal s_dma_write_cmd_addr: dma_address_array(0 to 1);
@ -174,6 +175,7 @@ architecture arch of puzzlefw_top_4ch is
signal s_tt_dma_data: dma_data_type;
signal s_timestamp: std_logic_vector(timestamp_bits - 1 downto 0);
signal s_adc_data_raw: adc_data_array(0 to 3);
signal s_adc_data: adc_data_array(0 to 3);
signal s_adc_sample: adc_data_array(0 to 3);
signal s_dig_in: std_logic_vector(3 downto 0);
@ -547,6 +549,15 @@ begin
s_reg_status.timestamp <= s_timestamp;
-- Register ADC derandomization switch.
-- GPIO(3) = '1' to enable ADC derandomizer, '0' to disable.
process (clk_adc) is
begin
if rising_edge(clk_adc) then
r_derandomize <= s_gpio_out(3);
end if;
end process;
-- Capture ADC data.
-- ADC A handles channels 0 and 1.
-- ADC B handles channels 2 and 3.
@ -559,7 +570,13 @@ begin
clk_intermediate => clk_adc_capture(0),
clk_handoff => clk_adc,
in_data => adc_dat_i(i),
out_data => s_adc_data(i) );
out_data => s_adc_data_raw(i) );
-- Optionally derandomize ADC samples.
s_adc_data(i)(0) <= s_adc_data_raw(i)(0);
gen_derandom: for k in 1 to 13 generate
s_adc_data(i)(k) <= s_adc_data_raw(i)(k) xor (s_adc_data_raw(i)(0) and r_derandomize);
end generate;
end generate;
-- Optionally generate simulated ADC samples.