( )knowledge of space developed rapidly.A、Person’sB、Mens’C、Men'sD、Man’s
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已知字符串s1='snow',s2='man',则表达式s1+s2的值为:A.'mansnow'B.'amnnosw'C.'snowman'D.7
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=a&b;#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
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
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
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)
下面的代码的执行结果是____ s = 'F' if s == 'f': print('lady') else: print('man')