設(shè)想當(dāng)SVC_REQ#43起作用時(shí)停止備份單元的輸出。停止備份單元的輸出會冒控制不同步切換的危險(xiǎn)(這會導(dǎo)致輸出的突變)。當(dāng)激活單元發(fā)生錯(cuò)誤或者掉電時(shí)而備份單元的輸出使能時(shí)，就可能發(fā)生此類錯(cuò)誤。但是，當(dāng)如果激活單元錯(cuò)誤或掉電并且備份單元的輸出使能時(shí)，系統(tǒng)的輸出被指定到他們默認(rèn)的連接上。備份單元輸出使能的第-5個(gè)作用是，激活單元確定不同步時(shí)的錯(cuò)誤列表中的動作哪個(gè)是致命的失誤。

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