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<HTML><HEAD> <META NAME="GENERATOR" CONTENT="Adobe PageMill 2.0 Mac"> <LINK REL="STYLESHEET" HREF="ch03.css"> <TITLE> 3.5 Implicit declarations </TITLE></HEAD><BODY BGCOLOR="#ffffff"><P><A NAME="pgfId=473"></A><HR ALIGN=LEFT></P><P><A HREF="ch03.htm">Chapter start</A> <A HREF="ch03.4.htm">Previous page</A> <A HREF="ch03.6.htm">Next page</A></P><H1>3.5 Implicit declarations</H1><P><P CLASS="Body"><A NAME="pgfId=431"></A>The syntax shown in 3.2 shallbe used to explicitly declare nets and registers. In the absence of an explicitdeclaration of a net or a register, statements for gate, user-defined primitive,and module instantiations shall assume an implicit net declaration. Thishappens when a name is used in the terminal list of an instance of a gate,a user-defined primitive, or a module that has not been explicitly declaredpreviously in one of the declaration statements of the instantiating module.See 7.9.</P><P><P CLASS="Body"><A NAME="pgfId=475"></A>These implicitly declared netsshall be treated as scalar nets of type <B>wire</B>. See Section 16 fora discussion of control of the type for implicitly declared nets with the<B>`default_nettype</B> compiler directive.</P><P><HR ALIGN=LEFT></P><P><A HREF="ch03.htm">Chapter start</A> <A HREF="ch03.4.htm">Previous page</A> <A HREF="ch03.6.htm">Next page</A></BODY></HTML>?? 快捷鍵說明
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