package - VHDL语法错误靠近 “procedure”。模式inout的正式crcreg必须具有关联的实际值

Question

我想用一个简单的测试台来测试这个软件包。我试图保持对象类，模式，类型以及信号名称相同。仍然存在以下语法错误。

1. Line 36: Syntax error near "procedure".
   2. Line 36: Formal crcreg of mode inout must have an associated actual
   3. Line 36: Formal has no actual or default value.
   4. Line 38: Syntax error near "package".
   5. Line 38: Expecting type void for .

1 library ieee;
2 use ieee.std_logic_1164.all;
3 use ieee.numeric_std.all;
4 use ieee.std_logic_unsigned.all;
5--use std.textio.all;
6
7 library work;            -- make library visible
8 use work.crc_function.all;   -- make package visible
9           
10
11 package crc_package is
12    procedure UpdateCRC(
13        signal CRCREG : inout STD_LOGIC_VECTOR (7 downto 0);
14        signal INBYTE : in STD_LOGIC_VECTOR (7 downto 0)
15        );
16 end crc_package;
17
18 package body crc_package is
19
20      -- type required for the CRC generation
21      type CrcValues_T is array (0 to 8) of STD_LOGIC_VECTOR(7 downto 0); 
22  
23      procedure UpdateCRC(
24      signal CRCREG : inout STD_LOGIC_VECTOR (7 downto 0);
25    signal INBYTE : in STD_LOGIC_VECTOR(7 downto 0)) is 
26    variable tmp : CrcValues_T;
27    begin
28      tmp(0) := CRCREG;
29      -- generate the logic for the next CRCREG byte using a
30      loop
31      for i in 1 to 8 loop
32          tmp(i) := NextCRCVal(tmp(i-1), INBYTE(i-1));
33      end loop;
34      -- tmp 8 is the final value
35      CRCREG <= tmp(8);
36  end procedure UpdateCRC; --
37
38 end package body crc_package;

测试台已声明以下信号

architecture behavioral of crc_function_tb is 
    signal clk          : std_logic := '0';
    signal reset        : std_logic := '0';
    signal CRCREG       : inout STD_LOGIC_VECTOR (7 downto 0):= (others => '0');
    signal INBYTE       : in STD_LOGIC_VECTOR(7 downto 0) := (others => '0');

在testbench中的以下测试过程块中调用该过程

101 test: process (clk, reset)
102 begin
103     wait for clk_period * 20;
104     CRCREG_loop: for i in 1 to 32 loop
105         INBYTE_loop:  for j in 1 to 8 loop
106                         wait for clk_period * 1;
107                         
108                          UpdateCRC(CRCREG, INBYTE);
109                             
110                    -- out1:= UpdateCRC(std_logic_vector(inp1), std_logic_vector(inp2));
111                         wait for clk_period * 5;
113                                 INBYTE <= INBYTE + 1;
114                 end loop;
115                 CRCREG <= CRCREG + 1;
116                 wait for clk_period * 1;
117                 end loop;
118 wait for clk_period * 20;
119 wait;
120 end process;

Answer 1

29      -- generate the logic for the next CRCREG byte using a
30      loop

您的评论分为两行；两行都需要注释指示符--。

您有像use ieee.numeric_std.all;这样的行，但是应该有一个初始library ieee;才能使它们起作用。

你有use ieee.std_logic_unsigned.all;;您没有使用任何东西，并且缺少use ieee.std_logic_1164.all;
修复这些问题后，您的程序包就会编译。请注意，您没有包括crc_function的代码，因此我不得不注释引用该代码的行。