说明：  辛辛苦苦找到的UDP的资料，在verilog中UDP指的是用户定义的原语。比如说大家有时候会见到“primitive...table...endtable...endendprimitive”这样的代码段，在书上只能找到大概的解释。到网上查的话又老是跟TCP/IP的UDP冲突。所以特地搜集到了这个东西，希望能帮助大家解决“用户原语”相关的问题。
(UDP hard to find the information in verilog in the UDP refers to the user-defined primitives. For example, we sometimes see the " primitive ... table ... endtable ... endendprimitive" This code segment can only be found in the book about interpretation. The online search, then they are always with the TCP/IP, UDP conflict. So, specifically to collect this stuff, hoping to help people solve the " user of the original language" related issues.)