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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:* o8 y0 ^- U! J; K7 h* Y7 y) q
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Inst_IOBUF_CAMA_FV : IOBUF- W7 a, H* R: r- z8 }
generic map (5 p3 K" D! D( ?- d
DRIVE => 12,+ j- Y2 R7 R) N9 j4 q9 p; C
IOSTANDARD => "DEFAULT",% h+ i @" Z5 N$ h+ g- E# X
SLEW => "SLOW")
5 g& E& t7 |6 t9 v7 X/ E8 C8 Z U port map (
" g& X: `2 m! s* C O => CAMA_FV_I_Buf, -- Buffer output
, _; }' K; {% j5 E IO => CAMA_FV_I, -- Buffer inout port (connect directly to top-level port)
! R0 m2 T; o$ t* G" H I => '0', -- Buffer input6 {- l) x3 H+ I% @" c) m
T => dummy_t -- 3-state enable input, high=input, low=output
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* A! b3 v, g2 \: _7 \ Inst_IOBUF_CAMA_LV : IOBUF$ _. y- y) O! v7 v) K* x y
generic map (
4 n1 i5 g4 R( b( H6 G/ c' k DRIVE => 12,3 F# @- v( \7 y; q6 F+ Y
IOSTANDARD => "DEFAULT",
0 K( N0 ?7 \+ d4 M# R SLEW => "SLOW")) g: Y! \2 w- {( {4 t
port map (
4 n) i6 b5 \; {" p: t; G- _; s O => CAMA_LV_I_Buf, -- Buffer output, G3 u6 N/ m3 \3 v9 G) t; l
IO => CAMA_LV_I, -- Buffer inout port (connect directly to top-level port)9 `7 h2 c/ R4 Y# y* r3 _, O
I => '0', -- Buffer input
. } b* o6 [$ A) z- V5 V" ?' u T => dummy_t -- 3-state enable input, high=input, low=output& ~% |- D% z; y9 G. c% ?$ e
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