实现 LFSR 作为全进位加法器的输入（错误 10500，语法错误）

Question

我正在尝试使用 lfsr 的输出作为 2 位全进位加法器的输入。

它在“rnd_word(0) => rnd_bit”上给了我这个错误：

错误 (10500)：somma_compl2.vhd(62) 文本“>”附近的 VHDL 语法错误；期待“（”，或标识符，或一元运算符

library ieee;
use ieee.std_logic_1164.all;

entity RippleAdder is
   port (a    : in  std_logic_vector(1 downto 0);
         b    : in  std_logic_vector(1 downto 0);
         cin  : in  std_logic;
         sum  : out std_logic_vector(2 downto 0);
            
            ck_1 : in std_logic
            );
end RippleAdder;

-- Ripple Carry Adder description using component instantiation statements

architecture structural of RippleAdder is
   
    
    component LFSR
        generic(
        width: positive := 2;   -- dimensione del LFSR
        bit_config: natural -- configurazione del LFSR
        );
    port(
        ck : in std_logic;  -- clock
        rst: in std_logic;  -- reset
        rnd_word: out std_logic_vector(0 to width-1)    -- parola pseudo-casuale
    );
    end component;
    
    
    SIGNAL rnd_bit : std_logic;
    
    
    
   component adder 
      port (a    : in  std_logic;
            b    : in  std_logic;
            cin  : in  std_logic;
            sum  : out std_logic;
            cout : out std_logic);
   end component;

   SIGNAL cout1 : std_logic;            
    
                  
begin

dut_lfsr: lfsr
    port map(
        ck => ck_1,
        rst => '1', --active low
        rnd_word(0) = > rnd_bit
        );
    
    
   -- component instantiation
   dut_adder1: adder
      PORT MAP (a    => rnd_bit,           
                b    => b(0),           
                cin  => cin,            
                sum  => sum(0),          
                cout => cout1);   
--a    => a(0),           
--b    => b(0),           
--cin  => cin,            
--sum  => sum(0),          
--cout => cout1);       

    

   dut_adder2: adder
      PORT MAP (a    => a(1),          
                b    => b(1),         
                cin  => cout1,         
                sum  => sum(1),        
                cout => sum(2));        
  
end structural;

我尝试了其他方法，比如在 std_logic_vector 中同时使用 rnd_word 和 rnd_bit

像这样使用它们：

dut_lfsr: lfsr
    port map(
    ck => ck_1,
    rst => '1', 
    rnd_word(0) = > rnd_bit(0)
    );

但我仍然得到同样的错误