如何修复有关敏感度列表的 Xilinx ISE 警告? [英] How to fix Xilinx ISE warning about sensitivity list?

问题描述

我使用 Xilinx ISE 13.1 综合了我的设计.目标设备是Virtex 5.然后我遇到了这个警告:

I synthesized my design with Xilinx ISE 13.1. Target device is Virtex 5. Then I encountered this warning:

 WARNING:Xst:819 - "F:/FRONT-END/h264/inter/src/eei/eei_mvd.vhd" 
line 539: One or more signals are missing in the process sensitivity list. 
To enable synthesis of FPGA/CPLD hardware, XST will assume that all necessary signals are present in the sensitivity list. 
Please note that the result of the synthesis may differ from the initial design specification. The missing signals are:    
<mvd_l0<3><3>>, <mvd_l0<3><2>>, <mvd_l0<3><1>>, <mvd_l0<3><0>>, <mvd_l0<2><3>>, <mvd_l0<2><2>>,
 <mvd_l0<2><1>>, <mvd_l0<2><0>>, <mvd_l0<1><3>>, <mvd_l0<1><2>>, <mvd_l0<1><1>>, <mvd_l0<1><0>>,
 <mvd_l0<0><3>>, <mvd_l0<0><2>>, <mvd_l0<0><1>>, <mvd_l0<0><0>>, <mvd_l1<3><3>>, <mvd_l1<3><2>>,
 <mvd_l1<3><1>>, <mvd_l1<3><0>>, <mvd_l1<2><3>>, <mvd_l1<2><2>>, <mvd_l1<2><1>>, <mvd_l1<2><0>>,
 <mvd_l1<1><3>>, <mvd_l1<1><2>>, <mvd_l1<1><1>>, <mvd_l1<1><0>>, <mvd_l1<0><3>>, <mvd_l1<0><2>>, 
<mvd_l1<0><1>>, <mvd_l1<0><0>>, <mvd<0>>, <mvd<1>>

这是我的源代码:

proc_update_next: process(mvd_l0, mvd_l1, mvd, subMBPart_Idx, MBPart_Idx, eei_info )
  begin
    --// Init
    next_mvd_l0 <= mvd_l0;
    next_mvd_l1 <= mvd_l1;
    --// Change
    if eei_info.mb_type =  BLK_8x8 then
      for  i in 3 downto 0 loop
        for  j  in 3 downto 0  loop
          if i = to_integer(unsigned(MBPart_Idx))  and j = to_integer(unsigned(subMBPart_Idx)) then
            next_mvd_l0(i)(j)  <=  mvd(0);
            next_mvd_l1(i)(j)  <=  mvd(1);
          end  if;
        end  loop;
      end loop;
    else
      for  i in 3 downto 0 loop
        if i = to_integer(unsigned(MBPart_Idx)) then
          next_mvd_l0(i)(0)  <=  mvd(0);
          next_mvd_l1(i)(0)  <=  mvd(1);
        end  if;
      end loop;
    end if;
  end process;

更新:我对代码进行了一些更改，但仍然出现此警告.

Update: I change a little bit in my code and still this warning.

mvd_l0 和 mvd_l1 是二维数组，出现在敏感度列表中.我知道我的源代码太抽象了，ISE可能看不懂.

The mvd_l0 and mvd_l1 is two-dimension array and it appeared on sensitivity list. I know my source code is too abstract and ISE may can not understand.

我尝试了 Virtex 7(在实验室中不可用)然后没有错误.所以，我的问题是如何解决这个警告?我不能忽略这个警告，因为它会导致闩锁.

I tried with Virtex 7 (not avaiable in laboratory) then there are no error. So, my question is how to fix this warning ? I can't ignore this warning because it can lead to latch.

推荐答案

使用 VHDL-2008 构造 process(all) 告诉工具您希望敏感度列表包含所有读取的信号.

Use the VHDL-2008 construct process(all) to tell the tools you want the sensitivity list to include all signals which are read.

或者，让它成为一个时钟进程，只对时钟敏感，然后你也不必担心.

Alternatively, make it a clocked process, only sensitive to the clock, and then you don't have to worry either.

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