双冗余双冗余在两两个CPU同时到Run模式时发生。首要的单元变成激活的单元,备用的单元变成备份的单元。非保持型数据被清除,#FST_ SCN值和#FST_ EXE位被设置为1。重新同步重新同步发生在一-个单元已经是运行模式的时候另–个单元要进入运行状态时。要切换到运行状态的单元会试图与正在运行的单元同步。转换中的单元会变成备份单元。
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