Tho*_*asM 5 arrays generics initialization vhdl
我想在 VHDL 中实现一个用于卷积内容的环形缓冲区并使其通用。我的问题是如何在不引入进一步信号或变量的情况下初始化内部数据。
通常我可以通过以下方式初始化 std_logic_vector
signal initialized_vector : std_logic_vector(15 downto 0) := (others => '0');
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但我不知道默认情况下如何在数组上执行此操作。
这是我的代码:
entity convolution_ringbuffer is
generic (
BitDepth_signal : integer := 24;
BufferSize : integer := 10
);
port (
data_in : in std_logic_vector(BitDepth_signal-1 downto 0);
sclk : in std_logic;
enable : in std_logic;
data_out : out std_logic_vector(BitDepth_signal-1 downto 0)
);
end convolution_ringbuffer;
architecture behavioral of convolution_ringbuffer is
type internal_data is array(0 to BufferSize-1) of std_logic_vector(BitDepth_signal-1 downto 0);
signal data_internal : internal_data;
begin
process ( sclk )
variable current_position : integer range 0 to (BufferSize-1) := 0;
begin
if ( rising_edge(sclk) and enable = '1' ) then
data_internal(current_position) <= std_logic_vector(data_in);
if ( current_position < BufferSize-1 ) then
current_position := current_position + 1;
else
current_position := 0;
end if;
end if;
if ( falling_edge(sclk) ) then
data_out <= std_logic_vector(data_internal(current_position));
end if;
end process;
end behavioral;
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您可以执行与 std_logic_vector 几乎相同的操作。你只需要考虑到你还有一个维度:
signal data_internal : internal_data := (others=>(others=>'0'));
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如果要存储更复杂的初始化数据,可以使用初始化函数:
function init return internal_data is
begin
--do something (e.g. read data from a file, perform some initialization calculation, ...)
end function init;
signal data_internal : internal_data := init;
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