|
|
回复 gn165625076 的帖子
2 p4 ^# S' z o! W
4 _, C. P( m {8 n! f$ APlace_Bound_Top7 K0 `+ S+ T8 M1 A2 H5 B7 G
# s! r T9 B4 L0 w T% k: C
Used to ensure you don’t place components on top of each without getting a DRC. This boundary! Z7 ?: x& ]( T! I
normally defines the component area which may or may not include pins of surface mount devices. 3 ^( C2 k! Z& \
This boundary can also be assigned a component high to be verified at the board level and checked
# H6 h0 L- @- ?4 Q# T* B$ }to the Package_Keepout_Top boundaries or any other special component clearances. If this boundary
* x7 C- A! `7 I0 j! | n$ @does not exist than it will be automatically created based on the Assembly_Top outline and the outer, }4 l6 @/ ?/ B% u
extents of the component pins. This boundary can only be defined at the symbol level (.dra). t6 ^; e' ~2 X, ^+ L! ^; }& n
; Y% P3 q: Q% l
& ]; E% w3 n0 r+ Q+ Y
, O) r% f- c3 G/ B) k# aPlace_Bound_Top用于确保你不会在其他器件的顶部放置器件，否则报DRC。这个功能定义了器件所占区域，包括表贴器件的pins（有些不包括）。这个功能也能用来定义板级检验时的器件高度，和检查Package_Keepout_Top或其他特殊器件间距。如果这个功能不存在，它将依照Assembly_Top的边框和器件pins的向外扩展，自动创建。这个功能只能在symbol级定义（.dra）。' ]" Z7 i [. B5 a6 B0 }/ q" x
( i% E& s2 G" p* G' Z
# t. ~5 n1 J, i# p
Dfa_Bound_Top+ _3 W0 ~: T L& E# m# c- g
6 s6 V$ q9 g& d7 z
Used by the Real Time Design for Assembly (DFA) Analysis to check clearances between components7 P: V) y2 l! \: ~, h; K
driven by a Spreadsheet based matrix of components. This boundary normally or can be different then- Z8 `( M" Y& P5 R9 x9 ?, M9 N, b8 f: i
the traditional Place_Bound_Top boundary and it may include pins of surface mount devices.
[4 X. Z0 [; c3 uIf this boundary does not exist than the DFA checks default to using the Place_Bound_Top boundary. ' w7 k5 g, V) P- r! ?- `
5 I" C# @/ N( l9 D3 D5 DThis boundary can only be defined at the symbol level (.dra).
9 f1 U i3 L( x7 V9 h8 ~7 B" s5 G: }' Q+ j. w4 M
/ v& o- w% M4 |5 W# H: }4 Z; n
1 r- W& x+ y' }+ S8 v" b. qDfa_Bound_Top$ r) a2 C( A$ M9 c
在实时设计中，在器件阵列的数据表驱动下，用它在装配（DFA）分析中检查器件间距。该功能（指定所占区域）可以相同，或不同于传统的Place_Bound_Top功能，即可能包含表贴器件的pins。如果这个功能不存在，则DFA检查就默认的使用Place_Bound_Top功能（来代替）。这个功能只能在symbol级定义（.dra）。( ?7 B0 k6 e7 {
, ~8 Y" F1 q7 @$ r! {8 n$ D5 p+ d5 y9 U/ T
" @; r" I$ J9 d6 i3 y& i# T
1 Z' p: R' t+ G! i: T: QPackage_Keepout_Top5 [: Z: I# L2 g2 f+ f
. ^, k, P4 a. I* m- ~0 FUsed to ensure you don’t violate placement keepout areas or high restricted area in a design.
2 \0 H& F2 U# i; J
( L$ l9 @: `0 ?This boundary can only be defined at the board level (.brd) and cannot be added to the
% {; _9 v9 O" P# V4 P rsymbol level (.dra) unless it is part of a Mechanical Symbol (.bsm)
6 p( y8 P( |! l: F' E1 K5 F# a! g1 k) w! K* T/ [
- k& _/ b) W. M6 n3 G2 u
Package_Keepout_Top
d$ T2 w' D! A- S! C' l用于确保在设计中，你不会在keepout区或高度受限区，非法放置器件。这个功能只能在board级（.brd）定义，不能添加到symbol级（.dra），除非他是机械symbol（.bsm）的一部分。* P* W* z8 L) }
|
|
/1 
发表于 2011-5-25 16:17
QQ好友和群
QQ空间
腾讯微博
腾讯朋友
微信
收藏
支持！
反对！
楼主
发表于 2011-5-25 21:46
dsf 
