我已经完成了代码,它可以工作,但是,当我尝试编写测试台时,我遇到了一些麻烦。输入 x 设置为 8 位,x: IN 设置为 BIT_VECTOR(N -1 降至 0)。当我编写测试台时,我不输入位号。
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
USE ieee.std_logic_unsigned.all;
ENTITY Count_ones IS
GENERIC (N: INTEGER := 8); -- number of bits
PORT ( x: IN BIT_VECTOR (N -1 DOWNTO 0); y: OUT NATURAL RANGE 0 TO N);
END ENTITY ;
architecture Behavioral of Count_ones is
TYPE count is Array (N DOWNTO 1) OF Natural;
signal a : count;
begin
a(0) <= 1 when (x(0) = '1')
else
0;
gen: FOR i IN N-1 DOWNTO 0
GENERATE
a(i+1) <= (a(i)+1) when (x(i)='0')
else
a(i);
END GENERATE;
y <= a(N-1);
end Behavioral;
试验台:
LIBRARY ieee;
USE ieee.std_logic_1164.ALL;
USE ieee.std_logic_unsigned.all;
ENTITY Count_ones_TB IS
END Count_ones_TB;
ARCHITECTURE behavior OF Count_ones_TB IS
COMPONENT Count_ones
PORT(
x : IN std_logic_vector(7 downto 0);
y : OUT std_logic_vector(0 to 3)
);
END COMPONENT;
--Inputs
signal x : std_logic_vector(7 downto 0) := (others => '0');
--Outputs
signal y : std_logic_vector(0 to 3);
BEGIN
-- Instantiate the Unit Under Test (UUT)
uut: Count_ones PORT MAP (
x => x,
y => y
);
stim_proc: process
begin
x <= "00010101";
wait for 100 ns;
x <= "00001001";
wait for 100 ns;
x <= "11111111101"
wait for 100ns;
-- insert stimulus here
wait;
end process;
END;
错误是
实体端口 x 与组件端口的类型 std_logic_vector 不匹配实体端口 y 与组件端口的类型 std_logic_vector 不匹配
请帮助我,我真的找不到解决这个问题的方法。
特定问题的答案是实体中的端口类型、组件中的端口和信号类型必须匹配。这是指向包含这些错误的代码的链接,并更正了更多错误。
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
USE ieee.std_logic_unsigned.all;
ENTITY Count_ones IS
GENERIC (N: INTEGER := 8); -- number of bits
PORT ( x: IN BIT_VECTOR (N -1 DOWNTO 0); y: OUT NATURAL RANGE 0 TO N);
END ENTITY ;
architecture Behavioral of Count_ones is
TYPE count is Array (N DOWNTO 0) OF Natural;
signal a : count;
begin
a(0) <= 1 when (x(0) = '1')
else
0;
gen: FOR i IN N-1 DOWNTO 0
GENERATE
a(i+1) <= (a(i)+1) when (x(i)='0')
else
a(i);
END GENERATE;
y <= a(N-1);
end Behavioral;
LIBRARY ieee;
USE ieee.std_logic_1164.ALL;
USE ieee.std_logic_unsigned.all;
ENTITY Count_ones_TB IS
END Count_ones_TB;
ARCHITECTURE behavior OF Count_ones_TB IS
COMPONENT Count_ones
GENERIC (N: INTEGER := 8); -- number of bits
PORT ( x: IN BIT_VECTOR (N -1 DOWNTO 0);
y: OUT NATURAL RANGE 0 TO N);
END COMPONENT;
--Inputs
signal x : BIT_VECTOR(7 downto 0) := (others => '0');
--Outputs
signal y : natural;
BEGIN
-- Instantiate the Unit Under Test (UUT)
uut: Count_ones PORT MAP (
x => x,
y => y
);
stim_proc: process
begin
x <= "00010101";
wait for 100 ns;
x <= "00001001";
wait for 100 ns;
x <= "11111101";
wait for 100ns;
-- insert stimulus here
wait;
end process;
END;
但是,我必须指出,您距离实现尝试计算数量的目标还有很长的路要走。
正因为如此:
- 我对你的代码的更正并不是唯一的正确答案。在事实上,我的更正甚至不是一个好的答案。我只是做了使代码编译和运行的最小更正。你需要要非常仔细地考虑您的所有端口和信号的类型设计应该是。
- 我的更正不会使您的代码正常工作,即计算数量 的。