mentor ee drc的问题

hardy

exoedion中我在走线的时候由于drc的原因导致线无法走，如何将drc关闭。求教大神

xw_superstar

simhfc 发表于 2013-6-22 00:38
Fromto和Pin pair的含义不完全一致：
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1 Y) g' j5 n+ R' v& L( }) U1 OThe Difference Between From-Tos and Pin Pairs

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simhfc

Fromto和Pin pair的含义不完全一致：
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The Difference Between From-Tos and Pin Pairs

( \& @: j0 w4 F5 ~Often times, from-to relationships can be confused with pin pair designations. To better understand these separate design attributes, please refer to the following definitions:
•Net line ordering/from-tos - Ordered, physical pairings of component pins that instruct the router where to etch from and to when creating physical transmission lines (traces).
•Pin pairs - Electrical pairings of component pins that are created for the purpose of defining electrical relationships between component pins in the form of constraints.
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只有定义了Pin pairs，才会生成虚拟节点(Virtual Pins)，也就是你说的T点——d，这样CES才能识别同一trace中的不同区段，才会显示各区段的长度；

  p2 `6 }0 ~; h8 M5 d单纯定义From-to的话，即使实际走线是拓扑结构，CES只识别两个pin之间的trace长度，而忽略拓扑。

hardy

simhfc 发表于 2013-6-20 21:35
: J. ?- ^+ A% e6 y" U3 J8 n1 A直接在CES里看啊，见图：

在ces中是不是只能在pin pair中查看不能在from to里面查看

simhfc

直接在CES里看啊，见图：
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* W" `4 E" r% Q  l$ JPCB单纯在PCB里，可以打开右键菜单 > Target Length/TOF Delay... > 选任一分支，Current下的就是。

hardy

simhfc 发表于 2013-6-20 15:02
7 d7 g8 d8 ]) M1 ?Editor Control > Common Settings > 取消 Interactive Place/Route DRC，会有提醒，选Yes。

9 v  C. s: h& @" T, i我想再请教一个问题
5 b& `$ z; T( s. Dddr的t形拓扑，ces中如何设置，如何查看其中adc adb dc db的长度。
（d是t点，a是cpu端。）先谢过了

simhfc

Editor Control > Common Settings > 取消 Interactive Place/Route DRC，会有提醒，选Yes。