【发布时间】：2014-03-17 21:59:47
【问题描述】：
在一个带有自检测试台的项目上工作，遇到一个我不明白的问题。
以下代码的问题是模拟中的错误。我将在代码中指出错误的来源：
LIBRARY ieee;
USE ieee.std_logic_1164.ALL;
use IEEE.NUMERIC_STD.ALL;
ENTITY TestBenchAutomated IS
-- Generics passed in
generic (m: integer := 3; n: integer := 5; h: integer := 4; DATA_SIZE: integer :=5);
END TestBenchAutomated;
ARCHITECTURE behavior OF TestBenchAutomated IS
-- Component Declaration for the Unit Under Test (UUT)
COMPONENT TopLevelM_M
generic (m: integer := 3; n: integer := 5; h: integer := 4; DATA_SIZE: integer :=5);
PORT(
clk : IN std_logic;
next_in : IN std_logic; --User input
rst_in : IN std_logic; --User input
OUTPUT : OUT SIGNED((DATA_SIZE+DATA_SIZE)+(m-1)-1 downto 0) --Calculated DATA output
);
END COMPONENT;
--Inputs
signal clk : std_logic := '0';
signal next_in : std_logic := '0';
signal rst_in : std_logic := '0';
--Outputs
signal OUTPUT : SIGNED((DATA_SIZE+DATA_SIZE)+(m-1)-1 downto 0);
-- Clock period definitions
constant clk_period : time := 10 ns;
--Variable to be used in assert section
type Vector is record
OUTPUT_test : SIGNED((DATA_SIZE+DATA_SIZE)+(m-1)-1 downto 0);
end record;
type VectorArray is array (natural range <>) of Vector;
constant Vectors : VectorArray := (
-- Values to be compaired to calculated output
(OUTPUT_test =>"000000110000"), -- 48
(OUTPUT_test =>"000011110110"), -- 246
(OUTPUT_test =>"000101001000"), -- 382 <--- Purposefully incorrect value, Should be '000100001000' = 264
(OUTPUT_test =>"111111010011"), -- -45
(OUTPUT_test =>"111101001100"), -- -180
(OUTPUT_test =>"111111001111"), -- -49
(OUTPUT_test =>"000000101011"), -- 43 Purposefully incorrect value, Should be '000010101011' = 171
(OUTPUT_test =>"000000010011"), -- 19
(OUTPUT_test =>"111111100101"), -- -27
(OUTPUT_test =>"111110111011"), -- -69
(OUTPUT_test =>"111110111011"), -- -69
(OUTPUT_test =>"000000101101"), -- 45
(OUTPUT_test =>"111011011110"), -- -290
(OUTPUT_test =>"000001010110"), -- 86
(OUTPUT_test =>"000011110010"), -- 242
(OUTPUT_test =>"00000111110"), -- 125
(OUTPUT_test =>"111111001001"), -- -55
(OUTPUT_test =>"000100010101"), -- 277
(OUTPUT_test =>"111111100011"), -- -29
(OUTPUT_test =>"111101111101"));-- -131
BEGIN
-- Instantiate the Unit Under Test (UUT)
uut: TopLevelM_M PORT MAP (
clk => clk,
next_in => next_in,
rst_in => rst_in,
OUTPUT => OUTPUT
);
-- Clock process definitions
clk_process :process
begin
clk <= '0';
wait for clk_period/2;
clk <= '1';
wait for clk_period/2;
end process;
-- Process to simulate user input and to check output is correct
Test :process
variable i : integer;
begin
wait for 100 ns;
rst_in <= '1';
wait for clk_period*3;
rst_in <= '0';
--Loops through enough times to cover matrix and more to show it freezes in S_Wait state
for i in 0 to 50 loop
for i in Vectors'range loop
next_in <= '1';
wait for clk_period*5;
next_in <= '0';
wait for clk_period*4; --Appropriate amount of clock cycles needed for calculations to be displayed at output
--Check the output is the same as expected
assert OUTPUT = Vectors(i).OUTPUT_test
report "Incorrect Output on vector line" & integer'image(i) &
lf & "Expected:" & integer'image(i)(to_integer((Vectors(i).OUTPUT_test))) --& lf &
--"But got" & integer'image(i)(to_integer(signed(OUTPUT)))
severity error;
end loop;
end loop;
wait;
end process;
END;
正如您在向量中看到的，我插入了两个不正确的值以确保代码正常工作。我在那里期待模拟中的错误，告诉我向量的地址 2 上存在错误以及它是什么整数。但是，模拟停止了，我得到了这个：
错误：索引 328 超出界限 1 到 1。 错误：正在进行 TestBenchAutomated.vhd:Test
信息：模拟器已停止。
显然，由向量中的二进制数表示的整数 328 会导致此错误，但我不明白为什么它会导致此错误，而不是我编写的那个错误。什么是超出边界的索引？
任何帮助将不胜感激。
谢谢
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标签： indexing vhdl simulation