Vhdl 意外的TOKBEGIN,应为AFFECT或分号
我是vhdl新手,我已经为12位二进制计数器编写了代码,我收到了这个错误(意外的tokbeagin,预期影响或分号)。请指导我解决此错误Vhdl 意外的TOKBEGIN,应为AFFECT或分号,vhdl,counter,Vhdl,Counter,我是vhdl新手,我已经为12位二进制计数器编写了代码,我收到了这个错误(意外的tokbeagin,预期影响或分号)。请指导我解决此错误 library IEEE; use IEEE.STD_LOGIC_1164.ALL; -- Uncomment the following library declaration if using -- arithmetic functions with Signed or Unsigned values use IEEE.NUMERIC_STD.ALL;
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
-- Uncomment the following library declaration if using
-- arithmetic functions with Signed or Unsigned values
use IEEE.NUMERIC_STD.ALL;
-- Uncomment the following library declaration if instantiating
-- any Xilinx primitives in this code.
--library UNISIM;
--use UNISIM.VComponents.all;
entity bin_count is
Port ( clk : in STD_LOGIC;
reset : in STD_LOGIC;
seq : out STD_LOGIC_VECTOR (11 downto 0));
end bin_count;
architecture Behavioral of bin_count is
signal ff, ff_next, max_pulse : std_logic_vector(11 downto 0)
begin
process(clk,reset)
begin
if(reset = '1') then
ff <= "000000000000"
elsif( rising_edge(clk)) then
ff <= ff_next
end if
end process;
ff_next <= ff + 1;
max_pulse <= '1' when ff = "111111111111" else
0;
seq<= ff
end
end Behavioral;
您的个人资料显示您尚未接受(在“帮助”下找到)。旅游团建议在提问之前先搜索网站。本例中的搜索没有找到一个错误的答案:HDLParsers:164还提到了一个预期的分号 在VHDL中,分号是语句和声明的分隔符。这种用法非常基本,除了扩展的BNF(它解决了如何解析VHDL语法)之外,在LRM的任何地方都找不到显示的需求 您遗漏了很多分号,这可能意味着在介绍VHDL的地方没有提到分隔符的使用 示例代码中的错误
除了5个缺少的分号外,没有可见的“+”运算符(ff不是无符号或有符号的值-请使用包numeric_std_unsigned,而不是numeric_std或使用类型转换) max_plus选项的赋值不是std_logic_vector子类型max_plus值的表达式(“111111111”和“0000000000000”而不是“1”和0) 有一个错误的(额外的)结束语句(也没有分号) 第一个错误出现在示例的第26行,没有第39行。你本可以指出位置的
architecture behavioral of bin_count is
signal ff, ff_next, max_pulse:
std_logic_vector(11 downto 0); -- missing semicolon
begin
process(clk, reset)
begin
if reset = '1' then
ff <= "000000000000"; -- missing semicolon
elsif rising_edge(clk) then
ff <= ff_next; -- missing semicolon
end if; -- missing semicolon
end process;
-- ff_next <= ff + 1; -- no visible operator "+"
ff_next <= std_logic_vector(unsigned(ff) + 1); -- type converts ff to unsigned
-- and the result back
-- or in the context clause use numeric_std_unsigned:
-- use ieee.numeric_std_unsigned.all; -- makes "+" visible
-- instead of numeric_std;
--
-- and here:
-- ff_next <= ff + 1;
-- abstract literal 0 and enumeration literal '1' are not values
-- of std_logic_vector:
-- max_pulse <= '1' when ff = "111111111111" else
-- '0';
-- use string literal instead:
max_pulse <= "111111111111" when ff = "111111111111" else
"000000000000";
-- (and there are other expressions available)
seq <= ff; -- missing semicolon
-- end -- errant end statement - this doesn't match anything.
end behavioral;
使用测试台:
library ieee;
use ieee.std_logic_1164.all;
entity bin_count_tb is
end entity;
architecture fum of bin_count_tb is
signal clk: std_logic := '0'; -- default value
signal reset: std_logic;
signal seq: std_logic_vector (11 downto 0);
begin
CLOCK:
process
begin
wait for 5 ns; -- half the clock period
clk <= not clk;
if now > 85000 ns then -- now returns simulation time
wait;
end if;
end process;
DUT:
entity work.bin_count
port map (
clk => clk,
reset => reset,
seq => seq
);
STIMULUS:
process
begin
reset <= '1';
wait for 11 ns;
reset <= '0';
wait;
end process;
end architecture;
ieee库;
使用ieee.std_logic_1164.all;
实体bin\u计数\u tb为
终端实体;
bin_count_tb的架构fum是
信号时钟:标准逻辑:='0';--默认值
信号复位:标准逻辑;
信号顺序:标准逻辑向量(11向下至0);
开始
时钟:
过程
开始
等待5秒;——时钟周期的一半
clk 85000 ns然后--现在返回模拟时间
等待
如果结束;
结束过程;
DUT:
实体work.bin\u计数
港口地图(
时钟=>clk,
重置=>重置,
seq=>seq
);
刺激:
过程
开始
重置该代码中有许多缺少的分号,正如错误消息所说的那样。
architecture foo of bin_count is
signal ff: std_logic_vector(11 downto 0);
signal max_pulse: std_logic;
begin
process(clk, reset)
begin
if reset = '1' then
ff <= (others => '0'); -- an aggregate
elsif rising_edge(clk) then
ff <= std_logic_vector(unsigned(ff) + 1);
end if;
end process;
max_pulse <= '1' when ff = "111111111111" else
'0';
seq <= ff;
end architecture;
library ieee;
use ieee.std_logic_1164.all;
entity bin_count_tb is
end entity;
architecture fum of bin_count_tb is
signal clk: std_logic := '0'; -- default value
signal reset: std_logic;
signal seq: std_logic_vector (11 downto 0);
begin
CLOCK:
process
begin
wait for 5 ns; -- half the clock period
clk <= not clk;
if now > 85000 ns then -- now returns simulation time
wait;
end if;
end process;
DUT:
entity work.bin_count
port map (
clk => clk,
reset => reset,
seq => seq
);
STIMULUS:
process
begin
reset <= '1';
wait for 11 ns;
reset <= '0';
wait;
end process;
end architecture;