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<a href="#" onmousedown="showPopup(this, 'popup00723');"><img src="seealsolink.png" border="0" alt="" title=""></a> SystemVerilog 3.1a语言参考手册</div>
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A.10 Footnotes (normative)</div>
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<li value="1" class="Element600">Embedded spaces are illegal.</li>
<li value="2" class="Element600">A simple_identifier, c_identifier, and arrayed_reference shall start with an alpha or underscore ( _ ) character, shall have at least one character, and shall not have any spaces.</li>
<li value="3" class="Element600">The $ character in a system_tf_identifier shall not be followed by white_space. A system_tf_identifier shall not be escaped.</li>
<li value="4" class="Element600">End of file.</li>
<li value="5" class="Element600">The unsigned number or fixed point number in time_literal shall not be followed by a white_space.</li>
<li value="6" class="Element600">implicit_class_handle shall only appear within the scope of a class_declaration or out-of-block method declaration.</li>
<li value="7" class="Element600">In any one declaration, only one of protected or local is allowed, only one of rand or randc is allowed, and static and/or virtual can appear only once.</li>
<li value="8" class="Element600">dpi_function_proto return types are restricted to small values, as per 27.4.5.</li>
<li value="9" class="Element600">Formals of dpi_function_proto and dpi_task_proto cannot use pass by reference mode and class types cannot be passed at all; for the complete set of restrictions see 27.4.6.</li>
<li value="10" class="Element600"> The apostrophe ( ‘ ) in unbased_unsized_literal shall not be followed by white_space.</li>
<li value="11" class="Element600"> unsized_dimension is permitted only in declarations of import DPI functions, see dpi_function_proto.</li>
<li value="12" class="Element600"> More than one unsized dimension is permitted only in declarations of import DPI functions, see dpi_function_proto.</li>
<li value="13" class="Element600"> When a packed dimension is used with the struct or union keyword, the packed keyword shall also be used.</li>
<li value="14" class="Element600"> A charge strength shall only be used with the trireg keyword. When the vectored or scalared keyword is used, there shall be at least one packed dimension.</li>
<li value="15" class="Element600"> In a data_declaration that is not within the procedural context, it shall be illegal to use the automatic keyword.</li>
<li value="16" class="Element600"> It shall be legal to omit the covergroup_variable_identifer from a covergroup instantiation only if this implicit instantiation is within a class that has no other instantiation of the covergroup.</li>
<li value="17" class="Element600"> The .* token shall appear at most once in a list of port connections.</li>
<li value="18" class="Element600"> A timeunits_declaration shall be legal as a non_port_module_item, non_port_interface_item, non_port_program_item, package_item or class_item only if it repeats and matches a previous timeunits_declaration within the same time scope.</li>
<li value="19" class="Element600"> In a multiple_concatenation, it shall be illegal for the multiplier not to be a constant_expression unless the type of the concatenation is string.</li>
<li value="20" class="Element600"> In a shallow copy the expression must evaluate to an object handle.</li>
<li value="21" class="Element600"> It shall be legal to use the $ primary in an open_value_range of the form [ expression : $ ] or [ $ : expression ].</li>
<li value="22" class="Element600"> { } shall only be legal in the context of a queue.</li>
<li value="23" class="Element600"> The $ primary shall be legal only in a select for a queue variable or in an open_value_range.</li>
<li value="24" class="Element600"> A type_identifier shall be legal as an enum_base_type if it denotes an integer_atom_type, with which an additional packed dimension is not permitted, or an integer_vector_type.</li>
<li value="25" class="Element600"> In a constant_function_call, all arguments shall be constant_expressions.</li>
<li value="26" class="Element600"> The list_of_port_declarations syntax is explained in Section 18.8, which also imposes various semantic restrictions, e.g., a ref port must be of a variable type and an inout port must not be. It shall be illegal to initialize a port that is not a variable output port.</li>
<li value="27" class="Element600"> It shall be legal to declare a void struct_union_member only within tagged unions.</li>
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