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定義狀態(tài)機當(dāng)前狀態(tài)為state ,次態(tài)為next _state;輸入a,輸出b,則下列為Mealy狀態(tài)機的寫法是()。

A.always@(posedge clk)case (state )0:next_state<=1;1:next_state<=x
B.always@(posedge clk)case (state )0:if(a==0)next_state<=1;else next_state<=x;1:next_state<=x
C.always@(posedge clk)case (state )0:if(state==0)next_state<=1;else next_state<=x;1:next_state<=x
D.以上都不對

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