经典IC设计面试问题4

yanzhang98

Difference between inter statement and         intra statement delay?

//define register variables
reg a, b,         c;

//intra assignment delays
initial
begin
a = 0; c =         0;
b = #5 a + c; //Take value of a and c at the time=0,         evaluate
//a + c and then wait 5 time units to assign value
//to         b.
end

//Equivalent method with temporary variables and         regular delay control
initial
begin
a = 0; c = 0;
temp_ac =         a + c;
#5 b = temp_ac; //Take value of a + c at the current time         and
//store it in a temporary variable. Even though a and         c
//might change between 0 and 5,
//the value assigned to b at         time 5 is unaffected.
end

微尘770021

顶一个。。。。。