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<HTML><HEAD> <META NAME="GENERATOR" CONTENT="Adobe PageMill 2.0 Mac"> <LINK REL="STYLESHEET" HREF="ch02.css"> <TITLE> 2.1 Lexical tokens</TITLE></HEAD><BODY BGCOLOR="#ffffff"><P><A NAME="pgfId=311"></A><HR ALIGN=LEFT></P><P><A HREF="ch02.htm">Chapter start</A> <A HREF="ch02.htm">Previous page</A> <A HREF="ch02.2.htm">Next page</A></P><H1>2.1 Lexical tokens</H1><P><P CLASS="Body"><A NAME="pgfId=312"></A>Verilog HDL source text filesshall be a stream of lexical tokens. A <I>lexical token</I> shall consistof one or more characters. The layout of tokens in a source file shall befree format--that is, spaces and newlines shall not be syntactically significantother than being token separators.</P><P><P CLASS="Body"><A NAME="pgfId=195"></A>The types of lexical tokens inthe language are as follows:</P><UL> <LI><A NAME="pgfId=196"></A>white space <LI><A NAME="pgfId=197"></A>comment <LI><A NAME="pgfId=199"></A>operator <LI><A NAME="pgfId=198"></A>number <LI><A NAME="pgfId=200"></A>string <LI><A NAME="pgfId=201"></A>identifier <LI><A NAME="pgfId=202"></A>keyword</UL><P><HR ALIGN=LEFT></P><P><A HREF="ch02.htm">Chapter start</A> <A HREF="ch02.htm">Previous page</A> <A HREF="ch02.2.htm">Next page</A></BODY></HTML>⌨️ 快捷键说明
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