透過select來控制輸出的訊號,可用於多訊號輸入時控制要輸出哪個 並且sel是二進位控制(00,01,10,11會輸出不同的訊號)  示意圖  上圖的的輸入每個都設定為4位元,所以輸入設定為[15;0] (共16位元) 而輸出為一個4位元訊號所以為[3:0]
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