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下面的網站提供他們個人在 PCB Layout 上的經驗值: t& [' ^5 D% M% h8 w9 TBoth SPI and Microwire are generally limited to on-board communications and traces of no longer than 6 inches, although longer distances (up to 10 feet) can be achieved given proper capacitance and lower bit rates. + t; U3 O$ Y8 `0 \8 d) N2 G. v( H+ z! P, T# {" v' \ http://www.embedded.com/design/connectivity/4023975/Serial-Protocols-Compared 6 d/ ?* v9 E/ B; T8 \: x5 N2 P. |: Y ! M! ^+ v9 a2 G' T$ e