经典IC设计面试问题11

yanzhang98

What is the difference between:

c = foo ? a : b;
and
if (foo) c = a;
else c = b;

The ? merges answers if the condition is "x", so for instance if foo = 1'bx, a = 'b10, and b = 'b11, you'd get c = 'b1x. On the other hand, if treats Xs or Zs as FALSE, so you'd always get c = b.

web_miner

很好问题，所以学习Verilog HDL一定要注意x和z的处理。