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給出N=8的蝶式變換,如圖題圖所示。⑴寫出互連函數關系。⑵如果采用omega網絡,需幾次通過才能完成此變換?

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正確答案:

解:⑴互聯函數關系:f(P2P1P0)=P0P1P2

⑵如果處理單元設有屏蔽位控制硬件,可讓PE0、PE2、PE5和PE7均處于屏蔽,PE1、PE3、PE4和PE6為活躍,只需要在omega網絡上通過一次,傳輸路徑無冗余。如果處理單元未設置屏蔽位控制硬件,就需要在omega網絡上通過兩次,此時,傳輸路徑就會出現很多冗余。

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