雙冗余雙冗余在兩兩個CPU同時到Run模式時發(fā)生。首要的單元變成激活的單元，備用的單元變成備份的單元。非保持型數(shù)據(jù)被清除，#FST_ SCN值和#FST_ EXE位被設(shè)置為1。重新同步重新同步發(fā)生在一-個單元已經(jīng)是運(yùn)行模式的時候另–個單元要進(jìn)入運(yùn)行狀態(tài)時。要切換到運(yùn)行狀態(tài)的單元會試圖與正在運(yùn)行的單元同步。轉(zhuǎn)換中的單元會變成備份單元。

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