请问spi总线最长能走多长？谢谢
时间：10-02
整理：3721RD
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如题
下面的網站提供他們個人在 PCB Layout 上的經驗值：
Both 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.
http://www.embedded.com/design/connectivity/4023975/Serial-Protocols-Compared
這樣的問法很攏統；
- SPI 快的到 40MHz、慢的到 100KHz
- 一對一還是一對多的連接方式涉及驅動能力和電路寄生電容，間接也影響傳輸距離。
- 全部都在 PCB 上跑，還是有纜線?用的又是哪種 PCB（單層、雙層）或哪種纜線?
下面的網站提供他們個人在 PCB Layout 上的經驗值：
Both 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.
http://www.embedded.com/design/connectivity/4023975/Serial-Protocols-Compared
50MHZ的 5000mil内 应该可以 经验值
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