VHDL中的多维数组问题?
我正在尝试在 VHDL 中使用多维数组,但要使其正常工作却遇到了很多麻烦。我的问题是我有一个给定大小的由 17 个向量组成的数组,其中包含 16 个向量。我想要做的是创建 17 个寄存器,它们是 16 * std_logic_vector 32 位的数组(其中 = my b, 512)。所以,我试图在寄存器实例化中传递一些东西来输入和输出,告诉编译器/合成器我想传递一些512位的东西...类似于C,如果我有:(
int var[COLS][ROWS][ELEMENTS];
memcpy(&var[3].. // I'm talking about 3rd COL here, passing in memory that is ROWS*ELEMENTS long
我的实际声明在这里:)
类型partial_pipeline_registers_type是std_logic_vector(iw - 1 downto 0)的数组(0到16,0到15); 信号 h_blk_pipelined_input :partial_pipeline_registers_type;
我尝试简单地使用 h_blk_pipelined_input(0) .. 最多 (16) 但这不起作用。我收到以下错误,这让我看到我需要对数组进行双重索引:
ERROR:HDLParsers:821 - (at the register) Wrong index type for h_blk_pipelined_input.
然后我尝试了下面的内容,然后收到此错误:
ERROR:HDLParsers:164 - (at the register code). parse error, unexpected TO, expecting COMMA or CLOSEPAR
instantiate_h_pipelined_reg : regn
generic map ( N=> b, init => bzeros )
port map ( clk => clk , rst => '0', en => '1',
input => h_blk_pipelined_input((i - 1), 0 to 15),
output=> h_blk_pipelined_input((i), 0 to 15));
-- Changing 0 to 15 to (0 to 15) has no effect...
我正在使用 XST,并从他们的文档(http://www .xilinx.com/itp/xilinx6/books/data/docs/xst/xst0067_9.html),上述内容应该有效:
...declaration:
subtype MATRIX15 is array(4 downto 0, 2 downto 0)
of STD_LOGIC_VECTOR (7 downto 0);
A multi-dimensional array signal or variable can be completely used:
Just a slice of one row can be specified:
MATRIX15 (4,4 downto 1) <= TAB_B (3 downto 0);
一种替代方案是我可以创建更多小 16 倍的寄存器,而不是尝试执行所有操作一次‘0 到 15’,我只会再做 15 次。然而,我认为这可能会导致合成效率低下,而且我认为这不是正确的解决方案。
编辑:
尝试了Ben所说的,
instantiate_h_m_qa_pipeline_registers: for i in 1 to 16 generate
instantiate_h_pipelined_reg : regn
generic map ( N=> b, init => bzeros )
port map ( clk => clk , rst => '0', en => '1',
input => h_blk_pipelined_input(i - 1),
output=> h_blk_pipelined_input(i));
end generate instantiate_h_m_qa_pipeline_registers;
信号现在定义为:
type std_logic_block is array (0 to 15) of std_logic_vector(iw - 1 downto 0) ;
type partial_pipeline_registers_type is array (0 to 16) of std_logic_block;
signal h_blk_pipelined_input : partial_pipeline_registers_type;
我从XST得到的错误是:
ERROR:HDLParsers:800 - ((其中寄存器部分是))的类型输入与 h_blk_pipelined_input 的类型不兼容。
我可以使用 ()() 语法而不是 ( , ) 做我之前能做的所有事情,所以我没有丢失任何东西,但它仍然没有解决我的问题。
编辑:
更进一步,在输入上使用转换函数 =>并输出=>寄存器实例化的参数,使用函数在数组类型和我需要的大小的 std_logic_vector 之间进行转换。它修复了“输入 =>” ' 部分,但是..
与 Formal OUT 模式相关的实际信号“输出”可能不是类型转换或函数调用。 (LRM 4.3.2.2)
I'm trying to use a multidimensional array in VHDL and I'm having a lot of trouble getting it to work properly. My issue is that I've got an array of 17, of 16 vectors, of a given size. What I want to do is create 17 registers that are array of 16 * std_logic_vector of 32 bits (which = my b, 512). So, I'm trying to pass in something to input and output on the register instantiation that tells the compiler/synthesizer that I want to pass in something that is 512 bits worth... Similar to in C if I had:
int var[COLS][ROWS][ELEMENTS];
memcpy(&var[3].. // I'm talking about 3rd COL here, passing in memory that is ROWS*ELEMENTS long
(My actual declaration is here:)
type partial_pipeline_registers_type is array (0 to 16, 0 to 15) of std_logic_vector(iw - 1 downto 0);
signal h_blk_pipelined_input : partial_pipeline_registers_type;
I tried simply using h_blk_pipelined_input(0) .. up to (16) but this doesn't work. I get the following error, which makes me see that I need to double index in to the array:
ERROR:HDLParsers:821 - (at the register) Wrong index type for h_blk_pipelined_input.
So then I tried what's below, and I get this error:
ERROR:HDLParsers:164 - (at the register code). parse error, unexpected TO, expecting COMMA or CLOSEPAR
instantiate_h_pipelined_reg : regn
generic map ( N=> b, init => bzeros )
port map ( clk => clk , rst => '0', en => '1',
input => h_blk_pipelined_input((i - 1), 0 to 15),
output=> h_blk_pipelined_input((i), 0 to 15));
-- Changing 0 to 15 to (0 to 15) has no effect...
I'm using XST, and from their documentation (http://www.xilinx.com/itp/xilinx6/books/data/docs/xst/xst0067_9.html), the above should have worked:
...declaration:
subtype MATRIX15 is array(4 downto 0, 2 downto 0)
of STD_LOGIC_VECTOR (7 downto 0);
A multi-dimensional array signal or variable can be completely used:
Just a slice of one row can be specified:
MATRIX15 (4,4 downto 1) <= TAB_B (3 downto 0);
One alternative is that I can create more registers that are 16 times smaller, and instead of trying to do all '0 to 15' at once, I would just do that 15 additional times. However, I think this may lead to inefficiency in synthesis and I don't feel like this is the right solution.
EDIT:
Tried what Ben said,
instantiate_h_m_qa_pipeline_registers: for i in 1 to 16 generate
instantiate_h_pipelined_reg : regn
generic map ( N=> b, init => bzeros )
port map ( clk => clk , rst => '0', en => '1',
input => h_blk_pipelined_input(i - 1),
output=> h_blk_pipelined_input(i));
end generate instantiate_h_m_qa_pipeline_registers;
The signals are now defined as:
type std_logic_block is array (0 to 15) of std_logic_vector(iw - 1 downto 0) ;
type partial_pipeline_registers_type is array (0 to 16) of std_logic_block;
signal h_blk_pipelined_input : partial_pipeline_registers_type;
And the error I get from XST is:
ERROR:HDLParsers:800 - ((where the register part is)) Type of input is incompatible with type of h_blk_pipelined_input.
I'm able to do everything I was able to do before, using ()() syntax instead of ( , ) so I haven't lost anything going this way, but it still doesn't resolve my problem.
EDIT:
Took it a step further and used a conversion function on the input => and output => arguments for the register instantiation, using a function to convert between the array type and just a std_logic_vector the size that I need. It fixed the 'input => ' part, but..
Actual associated with Formal OUT mode Signal 'output' may not be a type conversion or function call. (LRM 4.3.2.2)
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评论(2)
怎么样:
Xilinx 网站上的代码显然没有经过测试。由于
ARRAY OF ...
是类型,而不是子类型,因此它们的代码不应编译。编辑:这些自定义类型无法与现有 IP 组件很好地配合,但没关系,编译器可以轻松推断寄存器。尝试:
How about:
The code on that Xilinx site obviously isn't tested. Since
ARRAY OF ...
are types, not subtypes, their code shouldn't compile.EDIT: These custom types aren't going to play well with existing IP components, but that's ok, the compiler can infer registers easily enough. Try:
为了让事情正常进行,我必须使用一个函数来展平和取消展平与寄存器实例化交互的数据。
真正的问题归结为我有一个 std_logic_vector() 数组,它产生了一个寄存器实例化需要的大向量..然后寄存器给我返回了向量,我需要将其放入一个数组中向量。
创建一个函数然后执行以下操作效果很好。
To get things to play right, I had to use a function to flatten and unflatten my data interacting with the register instantiation.
The real issue boiled down to me having an array of std_logic_vector() that resulted in a large vector which the register instantiation needed to have.. and then the register was giving me back the vector, which I needed to put in to an array of vectors.
Creating a function and then doing the following is working great.