VHDL 初学 关于时序问题请教
library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_unsigned.all;
entity AD7714Contro is
port
(
POL,SYNC,RESET,BUF,STANDBY,CS, SCLK,DOUT: out std_logic;
CLK : in std_logic; -- <10MHz
DRDY,DIN : in std_logic;
R_set : in std_logic;
ADReadData : out std_logic_vector(15 downto 0)
);
end Contro;
architecture Contro of Contro is
constant ComFiltH : std_logic_vector(7 downto 0):= "00100100";
--constant FiltH : std_logic_vector(7 downto 0):= "00000001"; --0x01 50Hz
constant FiltH : std_logic_vector(7 downto 0):= "00000000"; --0x00 200Hz
constant ComFiltL : std_logic_vector(7 downto 0):= "00110100";
--constant FiltL : std_logic_vector(7 downto 0):= "10000000"; --0x80 50Hz
constant FiltL : std_logic_vector(7 downto 0):= "01100000"; --0x60 200Hz
constant ComMode : std_logic_vector(7 downto 0):= "00010100";
constant Mode : std_logic_vector(7 downto 0):= "00100000";
constant ComData : std_logic_vector(7 downto 0):= "01011100";
signal ReadData : std_logic_vector(15 downto 0);
signal OutData : std_logic_vector(7 downto 0);
signal i : std_logic_vector(3 downto 0);
signal j : std_logic_vector(4 downto 0);
signal k : std_logic;
type State is (IntState,FiltHState,WriteFiltH,FiltLState,WriteFiltL,ModeState,WriteMode,WaitState,DataState,ReadState);
signal ComState : State;
begin
process(CLK,R_set,DRdy,DIn)
begin
if R_set = '0' then
RESET <= '0';
CS <= '1';
k <= '1';
i <= "0000";
ComState <= IntState;
ELSIF (CLK='1' AND CLK'EVENT) THEN
case ComState is
----------------------
when IntState =>
if j > "01000" then
RESET <= '1';
else
j <= j + 1;
end if;
if DRDY = '0' then
ComState <= FiltHState;
OutData <= ComFiltH;
CS <= '0';
j <= "00000";
end if;
----------------------FiltHState
when FiltHState =>
if (i = "1000") then
i <= "0000";
ComState <= WriteFiltH;
OutData <= FiltH;
elsif (k = '1') then
DOut <= OutData(7);
OutData <= OutData(6 DOWNTO 0) & '0';
k <= '0';
else
k <= '1' ;
i <= i + 1;
end if;
----------------------WriteFiltH
when WriteFiltH =>
if (i = "1000") then
i <= "0000";
ComState <= FiltLState;
OutData <= ComFiltL;
elsif (k = '1') then
DOut <= OutData(7);
OutData <= OutData(6 DOWNTO 0) & '0';
k <= '0';
else
k <= '1' ;
i <= i + 1;
end if;
----------------------FiltLState
when FiltLState =>
if (i = "1000") then
i <= "0000";
ComState <= WriteFiltL;
OutData <= FiltL;
elsif (k = '1') then
DOut <= OutData(7);
OutData <= OutData(6 DOWNTO 0) & '0';
k <= '0';
else
k <= '1' ;
i <= i + 1;
end if;
----------------------WriteFiltL
when WriteFiltL =>
if (i = "1000") then
i <= "0000";
ComState <= ModeState ;
OutData <= ComMode;
elsif (k = '1') then
DOut <= OutData(7);
OutData <= OutData(6 DOWNTO 0) & '0';
k <= '0';
else
k <= '1' ;
i <= i + 1;
end if;
----------------------ModeState
when ModeState =>
if (i = "1000") then
i <= "0000";
ComState <= WriteMode;
OutData <= Mode;
elsif (k = '1') then
DOut <= OutData(7);
OutData <= OutData(6 DOWNTO 0) & '0';
k <= '0';
else
k <= '1' ;
i <= i + 1;
end if;
----------------------WriteMode
when WriteMode =>
if (i = "1000") then
i <= "0000";
ComState <= WaitState ;
elsif (k = '1') then
DOut <= OutData(7);
OutData <= OutData(6 DOWNTO 0) & '0';
k <= '0';
else
k <= '1' ;
i <= i + 1;
end if;
----------------------
when WaitState =>
if (DRdy = '0') then
if j < "01000" then
RESET <= '0';
ComState <= IntState;
j <= "00000";
else
ComState <= DataState;
ADReadData <= ReadData;
OutData <= ComData;
j <= "00000";
end if;
else
j <= j + 1;
end if;
----------------------
when DataState =>
if (i = "1000") then
i <= "0000";
ComState <= ReadState ;
elsif (k = '1') then
DOut <= OutData(7);
OutData <= OutData(6 DOWNTO 0) & '0';
k <= '0';
else
k <= '1' ;
i <= i + 1;
end if;
----------------------
when ReadState =>
if (j = "10000") then
j <= "00000";
ComState <= WaitState ;
OutData <= ComData;
elsif (k = '1') then
k <= '0';
else
j <= j + 1;
ReadData <= ReadData(14 DOWNTO 0) & DIn;
k <= '1';
end if;
----------------------
when others => ComState <= IntState;
Reset <= '0';
end case;
end if;
end process;
process(CLK)
begin
IF (CLK='0' AND CLK'EVENT) THEN
SCLK <= k;
end if;
end process;
end Contro;
本人做软件的刚改学VHDL 上面程序有什么不合理的地方，容易出故障的地方请斧正
[解决办法]
先把状态机改成三段式的再找问题。
process(CLK,R_set,DRdy,DIn)
这个敏感列表乱七八糟的，时序逻辑就不要后两个，组合逻辑就不要CLK
