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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:) n$ f& e6 R! C/ v' K2 s* ^, H
% J/ n+ K* _' q1 | Inst_IOBUF_CAMA_FV : IOBUF
) y! B% ] m% z& Y; t( d generic map (
) p1 X R @6 S& m h5 Z$ C4 b DRIVE => 12,: N+ ~. w* ?% k# M: N$ r
IOSTANDARD => "DEFAULT",
7 E/ W7 [9 R& x7 g A- o4 W# c5 L SLEW => "SLOW")1 X; V5 W( [) \7 c
port map (% D8 Q& U! G' T. X
O => CAMA_FV_I_Buf, -- Buffer output
; Z8 g/ H0 f% H0 O' J3 z W0 T" ] IO => CAMA_FV_I, -- Buffer inout port (connect directly to top-level port)# k6 ^3 N0 ~7 n4 k7 L
I => '0', -- Buffer input Q) Z6 o9 V( }
T => dummy_t -- 3-state enable input, high=input, low=output. w/ ~/ Y* j' _9 u
); & S2 d" y6 f) A H0 } @
, J7 @2 L" _! n9 ^" [7 ]
3 H" `2 Z* X; r1 V+ p7 z- d Inst_IOBUF_CAMA_LV : IOBUF
/ X3 H8 ^. Q5 N! S/ C# Z) A# A generic map (
6 w5 \- s. \* a) b2 E7 p DRIVE => 12,
& o" e, _2 H/ [4 C$ f* ` IOSTANDARD => "DEFAULT",1 e1 \2 L: z" M2 d& o( w/ e* Q
SLEW => "SLOW")
2 \( M9 G) Y0 w+ d) L port map (6 M, v3 I5 e$ w3 f8 w
O => CAMA_LV_I_Buf, -- Buffer output" v8 K! m) z1 S4 G# x7 p
IO => CAMA_LV_I, -- Buffer inout port (connect directly to top-level port)
3 U# h* y+ E4 _" l! u I => '0', -- Buffer input
) _0 L" T0 Y7 P1 Q" U/ O0 X6 x2 x T => dummy_t -- 3-state enable input, high=input, low=output1 a- q* O: x0 _8 Y
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