xilinx spartan6做一个摄像头显示的问题

只看该作者 · 2014-3-6 15:32

我用xilinx spartan6做一个摄像头显示的东西，发现一个奇怪的现象，如果设置cdc文件，用chipscope去测量FV场信号，LV行信号的话，就显示正常，如果取消cdc文件，则显示是扭曲的画面，不是是怎么回事呢？输入的FV,LV端口都做了buff处理啊，如下代码：

Inst_IOBUF_CAMA_FV : IOBUF
generic map (
   DRIVE => 12,
   IOSTANDARD => "DEFAULT",
   SLEW => "SLOW")
port map (
   O => CAMA_FV_I_Buf,    -- Buffer output
   IO => CAMA_FV_I, -- Buffer inout port (connect directly to top-level port)
   I => '0',    -- Buffer input
   T => dummy_t    -- 3-state enable input, high=input, low=output
);

Inst_IOBUF_CAMA_LV : IOBUF
generic map (
   DRIVE => 12,
   IOSTANDARD => "DEFAULT",
   SLEW => "SLOW")
port map (
   O => CAMA_LV_I_Buf,    -- Buffer output
   IO => CAMA_LV_I, -- Buffer inout port (connect directly to top-level port)
   I => '0',    -- Buffer input
   T => dummy_t    -- 3-state enable input, high=input, low=output
);