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回复 gn165625076 的帖子5 O5 Q4 j8 t" |1 O" |& Y [
( A; z& n" [: K1 m3 KPlace_Bound_Top" `. P3 d7 e! T; V
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Used to ensure you don’t place components on top of each without getting a DRC. This boundary8 e( ?3 w3 R' W6 i, ^% k
normally defines the component area which may or may not include pins of surface mount devices.
5 }2 v8 W" l4 Z3 W$ p- DThis boundary can also be assigned a component high to be verified at the board level and checked
) o B( X) K2 \/ ]3 |" @5 V7 S0 dto the Package_Keepout_Top boundaries or any other special component clearances. If this boundary
3 }* A1 C. \* K Ndoes not exist than it will be automatically created based on the Assembly_Top outline and the outer% E7 m% y6 T% _$ A; Z* w6 e
extents of the component pins. This boundary can only be defined at the symbol level (.dra).
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Place_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）。
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Dfa_Bound_Top w, T, u: x, u' \4 R
0 t- N5 p; X. B6 ]! @) O7 DUsed by the Real Time Design for Assembly (DFA) Analysis to check clearances between components
: u3 s+ {( s1 c+ w' Y- Ndriven by a Spreadsheet based matrix of components. This boundary normally or can be different then
! Z! D/ \( ^3 `3 J* e. c. Bthe traditional Place_Bound_Top boundary and it may include pins of surface mount devices.- F( b6 R- r9 ~, f
If this boundary does not exist than the DFA checks default to using the Place_Bound_Top boundary.
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This boundary can only be defined at the symbol level (.dra).
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4 A1 L2 a6 k* x E3 d% C0 dDfa_Bound_Top
" r' m$ X. W) u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）。
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, D& t2 _2 A; k2 q' ?Package_Keepout_Top) x2 Z: L3 D+ O- I( e6 P" r3 n
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Used to ensure you don’t violate placement keepout areas or high restricted area in a design.
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This boundary can only be defined at the board level (.brd) and cannot be added to the6 e( S I8 \' M5 ?4 M
symbol level (.dra) unless it is part of a Mechanical Symbol (.bsm)
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Package_Keepout_Top. t! ^/ d' |% }+ h' l. `1 H
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。2 y+ [, W) f3 C' G
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发表于 2011-5-25 16:17
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dsf 
发表于 2011-5-25 21:46
