无法将字符串[]转换为vhdl中的字符串

Question

我正在vhdl中编写代码并遇到此错误

 Assignment target incompatible with right side. Cannot convert 'dataArray' to 'STRING'

这是我的代码

 entity instructionTranslator is
    port(clk :in std_logic;
    instructionCode :in std_logic_vector(4 downto 0);
    instructionType:out std_logic_vector(1 downto 0) ;
    data :out string (1 to 1)--here is data
    );  
end instructionTranslator;
               .
               .
               .
architecture  Translator of instructionTranslator is    
    type dataArray is array (0 to 13)of string(1 to 1);

    process(clk) begin
      data<=dataArray(1);

应该如何在vhdl中选择数组的特殊索引.

Answer 1

这里.我为你做了一个[MCVE].这个编译.

你声明了一个类型dataArray.然后你没有继续声明该类型的信号(或变量或常数).

将一个类型的成员(这是抽象的东西)分配给一个真实的信号显然是行不通的.

然而,分配该类型的信号(等)的成员......

library ieee;
use ieee.std_logic_1164.all;

entity instructionTranslator is
    port(clk :in std_logic;
    instructionCode :in std_logic_vector(4 downto 0);
    instructionType:out std_logic_vector(1 downto 0) ;
    data :out string (1 to 1)--here is data
    );  
end instructionTranslator;


architecture  Translator of instructionTranslator is    
    type dataArray is array (0 to 13)of string(1 to 1);
    signal da : dataArray;
begin

    process(clk) is
    begin
      data<=da(1);
    end process;
end Translator;