关于stubs是怎样的走线?6 Z# U) C1 y1 k( m
• Avoid stubs on high-speed USB signals, as stubs will cause signal reflections and $ k8 O- u& n" b% C& _affect signal quality. If a stub is unavoidable in the design, the total of all the stubs - a; Z! V1 H- @! f- O" H8 T4 bon a particular line should not be greater than 200 mils.3 ^+ }& I% I e. M, C& g( J
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