KutningJo/signal_processing_vorlage
2
0
Fork 26
Code Issues Pull Requests Releases Wiki Activity

crc_Lösung

Browse Source
This commit is contained in:
allamaaki80515 2026-01-13 09:59:29 +01:00
parent 44296a640b
commit 8997e1cb97
1 changed files with 80 additions and 74 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

72
hardware/signal_processing/crc.vhd
View File

@ -10,31 +10,34 @@ entity crc is
port (
clk : in std_logic;
reset : in std_logic;
task_start : in std_logic;
task_state : out work.task.State;
signal_read : out std_logic;
signal_readdata : in std_logic_vector(31 downto 0);
signal_readdata : in std_logic_vector( 31 downto 0 );
signal_write : out std_logic;
signal_writedata: out std_logic_vector(31 downto 0)
signal_writedata : out std_logic_vector( 31 downto 0 )
);
end entity crc;
architecture rtl of crc is
signal current_task_state : work.task.State;
signal next_task_state : work.task.State;
signal index : integer range 0 to work.task.STREAM_LEN := 0;
signal index : integer range 0 to work.task.STREAM_LEN;
constant CRC_INIT : std_logic_vector(31 downto 0) := X"FFFFFFFF";
constant CRC_POLY : std_logic_vector(31 downto 0) := X"EDB88320";
signal crc : std_logic_vector(31 downto 0) := CRC_INIT;
signal crc_reg : std_logic_vector(31 downto 0) := CRC_INIT;
signal data_reg : std_logic_vector(31 downto 0);
signal data_valid : std_logic := '0';
signal data_ready : std_logic := '0';
begin
task_state <= current_task_state;
-- TASK STATE MACHINE (VORLAGE - nicht ändern!)
task_state_transitions: process(current_task_state, task_start, index)
task_state_transitions : process ( current_task_state, task_start, index ) is
begin
next_task_state <= current_task_state;
case current_task_state is
@ -43,8 +46,7 @@ begin
next_task_state <= work.task.TASK_RUNNING;
end if;
when work.task.TASK_RUNNING =>
-- WICHTIG: Schreiben nach 1024 Werten (index 0-1023)
if index = 1023 then
if index = work.task.STREAM_LEN then
next_task_state <= work.task.TASK_DONE;
end if;
when work.task.TASK_DONE =>
@ -54,25 +56,24 @@ begin
end case;
end process;
-- Data Channel Control
signal_read <= '1' when current_task_state = work.task.TASK_RUNNING
and data_valid = '0'
and index < 1024
and data_ready = '0'
and index < work.task.STREAM_LEN
else '0';
signal_write <= '1' when current_task_state = work.task.TASK_DONE else '0';
signal_writedata <= crc xor X"FFFFFFFF"; -- Final XOR
-- Haupt-Sync Process (identisch zur SW-Version)
sync: process(clk, reset)
signal_writedata <= crc_reg xor X"FFFFFFFF";
sync : process ( clk, reset ) is
variable temp_crc : std_logic_vector(31 downto 0);
begin
begin
if reset = '1' then
current_task_state <= work.task.TASK_IDLE;
index <= 0;
crc <= CRC_INIT;
data_reg <= (others => '0');
data_valid <= '0';
crc_reg <= CRC_INIT;
data_reg <= X"00000000";
data_ready <= '0';
elsif rising_edge(clk) then
current_task_state <= next_task_state;
@ -80,22 +81,23 @@ begin
case next_task_state is
when work.task.TASK_IDLE =>
index <= 0;
crc <= CRC_INIT;
data_valid <= '0';
crc_reg <= CRC_INIT;
data_ready <= '0';
data_reg <= X"00000000";
when work.task.TASK_RUNNING =>
-- 1. DATA LESEN (Timing: signal_read='1' -> NEXT CLK data_valid)
-- DATA LESEN (Timing korrekt)
if signal_read = '1' then
data_reg <= signal_readdata;
data_valid <= '1';
data_ready <= '1';
end if;
-- 2. CRC UPDATE (zlib: XOR dann 32x bitweise LSB-first)
if data_valid = '1' then
temp_crc := crc xor data_reg;
crc <= temp_crc;
-- CRC UPDATE (INDEX PRÜFEN VOR Update!)
if data_ready = '1' then
-- WICHTIG: Index bleibt gleich bis TASK_DONE triggert!
--temp_crc := crc_reg xor data_reg; -- Berechne aber schreibe nicht sofort
-- 32 Bit LSB-first Verarbeitung in EINEM Takt (wie SW)
temp_crc := crc_reg xor data_reg;
for i in 0 to 31 loop
if temp_crc(0) = '1' then
temp_crc := std_logic_vector(shift_right(unsigned(temp_crc), 1)) xor CRC_POLY;
@ -103,18 +105,22 @@ begin
temp_crc := std_logic_vector(shift_right(unsigned(temp_crc), 1));
end if;
end loop;
crc <= temp_crc;
data_valid <= '0';
crc_reg <= temp_crc;
data_ready <= '0';
-- INDEX NUR erhöhen wenn NICHT letzter!
if index < work.task.STREAM_LEN then
index <= index + 1;
end if; -- Bei index=1023: bleibt 1023 → TASK_DONE triggert!
end if;
when work.task.TASK_DONE =>
index <= 0;
data_valid <= '0';
data_ready <= '0';
end case;
end if;
end process;
end process sync;
end architecture rtl;