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The young are always anxious at man’s estate. (英译汉)
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下列是基于过程块的组合逻辑建模的代码，设计正确的是（）A.reg y; reg a,b,clear; ... always@* if(clear) y=1'b0; always@* y=a b;#B.always@* if (clear) y=1'b0; else y=ab;#C.always@(a) y=a b;#D.reg [1:0] s; ... case(s) 2'b00:y=1'b1; 2'b10:y=1'b0; 2'b11:y=1'b1; endcase
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4、以下的描述中，必然是对Mealy型状态机的描述的是？A.always @(*) case (state) S0: begin out = 0; if (in) next_state = S1; else next_state = S2; end ……#B.always @(*) case (state) S0: begin if (in) next_state = S1; else next_state = S0; end ……#C.always @(*) case (state) S0: begin if (in) begin next_state = S1; out=1 end else next_state = S0; end ……#D.以上答案均不正确
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关于以下程序，下列说法中正确的是 module Mux21 （a,b,s,y); input a,b; input s; output y; reg y; always @（a or b or s) if （!s) y = a; else y = b; endmoduleA．每当a或b或s生变化时，将执行always模块内语句B．a,b可以被定义为wire型C．该程序输出的表达式为y=(~s)a+sbD．y可以被定义为wire型
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3、下列哪一个表述是正确：A．always@(posedge CLK or RST)B．always@(posedge CLK or negedge RST or A)C．always@(posedge CLK or D or Q)D．always@(posedge CLK or negedge RST)
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下列Moore型状态机采用Verilog语言主控时序部分正确的是：A．always@(posedge clk or negedge reset) begin if(!reset) current_state＜=s0; else current_state＜=next_state; endB．always@(posedge clk ) begin if(!reset) current_state＜=s0; else current_state＜=next_state; endC．always@(posedge clk t) if(reset) current_state＜=s0; else current_state＜=next_state;D．always@(posedge clk or negedge reset) if(reset) current_state＜=s0; else current_state＜=next_state;
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以下的描述中，必然是对Mealy型状态机的描述的是？A.always @(*) case (state) S0: begin out = 0; if (in) next_state = S1; else next_state = S2; end ……#B.always @(*) case (state) S0: begin if (in) next_state = S1; else next_state = S0; end ……#C.always @(*) case (state) S0: begin if (in) begin next_state = S1; out=1 end else next_state = S0; end ……#D.以上答案均不正确
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