TA的每日心情 | 无聊 2019-11-19 15:32 |
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签到天数: 1 天 [LV.1]初来乍到
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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:
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Inst_IOBUF_CAMA_FV : IOBUF
1 z( ~7 y0 g! A; ?$ N generic map (
0 o. h' M: K, }$ l DRIVE => 12,) [# Y: y/ U# o( h
IOSTANDARD => "DEFAULT", t, m/ ~' a# v- K2 S# H% _) @
SLEW => "SLOW")
# Z! h2 j( Z$ y1 T" k port map (
/ T6 u. D4 e* A' Q6 A, d O => CAMA_FV_I_Buf, -- Buffer output. C4 t! b S9 n. v' Q1 w: p7 P
IO => CAMA_FV_I, -- Buffer inout port (connect directly to top-level port)
" w% P% [: [( z0 `7 \ I => '0', -- Buffer input3 K+ }+ o8 C6 Z, B8 i X
T => dummy_t -- 3-state enable input, high=input, low=output
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. e' E7 n7 Y3 H! G/ }# @
Inst_IOBUF_CAMA_LV : IOBUF
I0 v# g6 g- l3 v generic map (9 m2 m5 t. K0 D% _$ D; H& t; I
DRIVE => 12,2 T1 s4 _# f& \ }: H3 u; v( q+ z
IOSTANDARD => "DEFAULT",+ U8 t6 p% T' L6 i+ ?. f& B+ |7 e( h% z& v
SLEW => "SLOW")3 D' ]$ I" Z6 W i7 c
port map (6 z8 t2 x& `8 L( C) d% n( B
O => CAMA_LV_I_Buf, -- Buffer output
7 m& ~+ H$ U( N9 W IO => CAMA_LV_I, -- Buffer inout port (connect directly to top-level port)
/ J4 n3 m) j, p1 g% u2 Q3 L( Q7 } I => '0', -- Buffer input
3 V4 k6 s: a' M2 l* c4 u- v T => dummy_t -- 3-state enable input, high=input, low=output$ t- H) A1 h x7 o0 ?
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