非阻塞赋值语句中延时在左边和右边的差别
时间：10-02
整理：3721RD
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请教各位非阻塞赋值语句中延时在左边和右边的差别?例如下面两个例子：
例一：
module exchange;
reg[3:0] a, b;
initial begin
a=1; b=4;
#2 a=3; b=2;
#20 $finish;
end
initial
$monitor($time, "\t%h\t%h", a, b);
initial begin
a <= #5 b;
b <= #5 a;
end
endmodule
例二：
module exchange;
reg[3:0] a, b;
initial begin
a=1; b=4;
#2 a=3; b=2;
#20 $finish;
end
initial
$monitor($time, "\t%h\t%h", a, b);
initial begin
#5 a <= b;
#5 b <= a;
end
endmodule
例一：
module exchange;
reg[3:0] a, b;
initial begin
a=1; b=4;
#2 a=3; b=2;
#20 $finish;
end
initial
$monitor($time, "\t%h\t%h", a, b);
initial begin
a <= #5 b;
b <= #5 a;
end
endmodule
例二：
module exchange;
reg[3:0] a, b;
initial begin
a=1; b=4;
#2 a=3; b=2;
#20 $finish;
end
initial
$monitor($time, "\t%h\t%h", a, b);
initial begin
#5 a <= b;
#5 b <= a;
end
endmodule