1.組合的特點(diǎn)

If a digital circuit, the circuit's output at any one time, just decided that the time of the input circuit, but has nothing to do with the circuit to its original state, then the sub-circuit is called the combinational logic circuits, referred to as combinational circuits. If the combinational logic circuit is only one output, called the single-output combinational logic circuit; if more than one output, called the multi-output combinational logic circuit

如果一個(gè)數(shù)字電路，電路的任一時(shí)刻的輸出，剛剛決定，該輸入電路的時(shí)間，但已無(wú)關(guān)的到其原始狀態(tài)的電路，則子電路稱(chēng)為組合邏輯電路，稱(chēng)為作為組合邏輯電路。如果組合邏輯電路只有一個(gè)輸出，稱(chēng)為單輸出組合邏輯電路;如果超過(guò)一個(gè)輸出，稱(chēng)為多輸出組合邏輯電路

2.組合邏輯電路的組成

組合邏輯電路的組成方框圖如圖1所示。它有n個(gè)輸入端，m個(gè)輸出端，Xi為輸入邏輯變量，Yi為輸出邏輯變量。輸出變量Y1，Y2，...，Ym是輸入變量X1、X2，…，Xn的函數(shù)，即：

                 Y1=f1(X1,X2,…,Xn)
                 Y2=f2(X1,X2,…,Xn)
                         ┇
                  Ym=fm(X1,X2,…,Xn)

組合邏輯電路圖