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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:( W* ?% l8 u) E4 b) m& Y
, y" x( J2 S% h; k% I6 a Inst_IOBUF_CAMA_FV : IOBUF
, T4 _3 k2 ]2 @& L: K, Q& Y0 t generic map (
6 H: v7 P9 H/ N* f6 j8 K" K DRIVE => 12,
' F0 ? G9 L) F IOSTANDARD => "DEFAULT",
: |7 a1 L! ^. v" I SLEW => "SLOW")+ c& x& k9 v: {- _) t) T6 y
port map () L" L) V6 ?( b0 Y
O => CAMA_FV_I_Buf, -- Buffer output
+ ?+ H- A( A' R3 o" G; z IO => CAMA_FV_I, -- Buffer inout port (connect directly to top-level port)/ D1 S& a# d; G f- {8 u# z- W! D
I => '0', -- Buffer input- T6 k; \' c4 I+ }: r% s% C
T => dummy_t -- 3-state enable input, high=input, low=output
7 D6 x) R, O3 C! u4 q; m" |) L ); / J8 i# R" t3 N# r5 y6 O/ Z3 I+ U9 J3 B- ?
3 O( p! T6 ~+ M" a9 U, n
* ?8 N6 x! z* } Inst_IOBUF_CAMA_LV : IOBUF& c: I2 I4 s/ Y
generic map (
6 v0 E0 _* M: z, G& Y( m$ o' d9 O0 P DRIVE => 12,
) E8 I: G) G- C. ?: x K IOSTANDARD => "DEFAULT",! i' Q, [# V0 d" d
SLEW => "SLOW")0 a5 s7 A) F- g2 Q1 g/ v0 @6 Q
port map (2 w- B8 ]) N" h% R: \ ]: [
O => CAMA_LV_I_Buf, -- Buffer output
" Y2 m! F( l4 i0 x' N6 p, F IO => CAMA_LV_I, -- Buffer inout port (connect directly to top-level port)- h; i, `' D. K$ r% y" M+ L4 B! n t
I => '0', -- Buffer input
% U, n; X$ X* m6 U( d" ^3 F T => dummy_t -- 3-state enable input, high=input, low=output
6 |% |+ w2 v5 ]+ O2 q ); |
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