刚学VHDL不久，尝试着写了个16位乘法器程序，思路就是把序列A 与B的每一位相乘并移位相加，但是程序通不过。。求助啊。。。
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_ARITH.ALL;
use IEEE.STD_LOGIC_UNSIGNED.ALL;
-- Uncomment the following library declara
tion if using
-- arithmetic functions with Signed or Unsigned values
--use IEEE.NUMERIC_STD.ALL;
-- Uncomment the following library declaration if instantiating
-- any Xilinx primitives in this code.
--library UNISIM;
--use UNISIM.VComponents.all;
entity multiplier1 is
port(A:in STD_LOGIC_VECTOR(15 downto 0);
B:in STD_LOGIC_VECTOR(15 downto 0);
rst:in std_logic;
clk:in std_logic;
Q:out STD_LOGIC_VECTOR(31 downto 0));
end multiplier1;
architecture Behavioral of multiplier1 is
signal QT:std_logic_vector(31 downto 0);
signal TEMP:std_logic_vector(31 downto 0);
signal n:integer:=0;
begin
process(clk)
begin
if rst='0' then Q<="00000000000000000000000000000000";
elsif rising_edge(clk) then
if (n<=15) then
if (B(n)=1) then TEMP<="0000000000000000" & A;
case n is
when 0=>
TEMP<=TEMP;
when 1=>
TEMP<=TEMP(30 downto 0)&"0";
when 2=>
TEMP<=TEMP(29 downto 0)&"00";
when 3=>
TEMP<=TEMP(28 downto 0)&"000";
when 4=>
TEMP<=TEMP(27 downto 0)&"0000";
when 5=>
TEMP<=TEMP(26 downto 0)&"00000";
when 6=>
TEMP<=TEMP(25 downto 0)&"000000";
when 7=>
TEMP<=TEMP(24 downto 0)&"0000000";
when 8=>
TEMP<=TEMP(23 downto 0)&"00000000";
when 9=>
TEMP<=TEMP(22 downto 0)&"000000000";
when 10=>
TEMP<=TEMP(21 downto 0)&"0000000000";
when 11=>
TEMP<=TEMP(20 downto 0)&"00000000000";
when 12=>
TEMP<=TEMP(19 downto 0)&"000000000000";
when 13=>
TEMP<=TEMP(18 downto 0)&"0000000000000";
when 14=>
TEMP<=TEMP(17 downto 0)&"00000000000000";
when 15=>
TEMP<=TEMP(16 downto 0)&"000000000000000";
when others
TEMP<=(others=>'0');
end case;
QT<=QT+TEMP;
n<=n+1;
end if;
else Q<=QT;
end if;
end if;
end process;
end Behavioral;
但是有两个error
ERROR:HDLParsers:808 - "D:/my project/multi/multiplier1.vhd" Line 52. = can not have such operands in this context.
ERROR:HDLParsers:164 - "D:/my project/multi/multiplier1.vhd" Line 87. parse error, unexpected IDENTIFIER, expecting PIPE or ROW
怎么弄啊？大神有什么好的建议也可以说说~
举报
