在雙總線網(wǎng)絡中，這樣放置總線控制器可以最大限度減小兩個單元之間總線的擁堵?？偩€擁堵的結果是–些設備交換總線控制權，使其它的設備不能被其中一個單元讀寫。這種錯誤情況下第一-單元會控制VO,以免輸入丟失和輸出不同步。

 

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