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📁 这是一本关于verilog编程语言的教程,对学习verilog语言有帮助
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A.1.3 模块和原语源文本</div>
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<div class="Element13"><div class="Element12" id="code01066"><pre class="Element12">source_text ::= [timeunits_declaration] {description}

description ::=
    module_declaration
  | udp_declaration
  | interface_declaration
  | program_declaration
  | package_declaration
  | {attribute_instance} package_item
  | {attribute_instance} bind_directive

module_nonansi_header ::=
    {attribute_instance} module_keyword [lifetime] module_identifier [parameter_port_list]
        list_of_ports<strong><span style="color: #FF0000">;</span></strong>

module_ansi_header ::=
    {attribute_instance} module_keyword [lifetime] module_identifier [parameter_port_list]
        [list_of_port_declarations]<strong><span style="color: #FF0000">;</span></strong>

module_declaration ::=
    module_nonansi_header [timeunits_declaration] {module_item}
        <strong><span style="color: #FF0000">endmodule</span></strong>[<strong><span style="color: #FF0000">:</span></strong> module_identifier]
  | module_ansi_header [timeunits_declaration] {non_port_module_item}
        <strong><span style="color: #FF0000">endmodule</span></strong>[<strong><span style="color: #FF0000">:</span></strong> module_identifier]
  | {attribute_instance} module_keyword [lifetime] module_identifier<strong><span style="color: #FF0000">(.*);</span></strong>
        [timeunits_declaration] {module_item} <strong><span style="color: #FF0000">endmodule</span></strong>[<strong><span style="color: #FF0000">:</span></strong> module_identifier]
  | <strong><span style="color: #FF0000">extern</span></strong> module_nonansi_header
  | <strong><span style="color: #FF0000">extern</span></strong> module_ansi_header

module_keyword ::= <strong><span style="color: #FF0000">module</span></strong> | <strong><span style="color: #FF0000">macromodule</span></strong>

interface_nonansi_header ::=
    {attribute_instance} <strong><span style="color: #FF0000">interface</span></strong> [lifetime] interface_identifier
        [parameter_port_list] list_of_ports<strong><span style="color: #FF0000">;</span></strong>

interface_ansi_header ::=
    {attribute_instance} <strong><span style="color: #FF0000">interface</span></strong> [lifetime] interface_identifier
        [parameter_port_list] [list_of_port_declarations]<strong><span style="color: #FF0000">;</span></strong>

interface_declaration ::=
    interface_nonansi_header [timeunits_declaration] {interface_item}
        <strong><span style="color: #FF0000">endinterface</span></strong> [<strong><span style="color: #FF0000">:</span></strong> interface_identifier]
  | interface_ansi_header [timeunits_declaration] {non_port_interface_item}
        <strong><span style="color: #FF0000">endinterface</span></strong> [<strong><span style="color: #FF0000">:</span></strong> interface_identifier]
  | {attribute_instance} <strong><span style="color: #FF0000">interface</span></strong> interface_identifier<strong><span style="color: #FF0000">(.*);</span></strong>
        [timeunits_declaration] {interface_item}
        <strong><span style="color: #FF0000">endinterface</span></strong> [<strong><span style="color: #FF0000">:</span></strong> interface_identifier]
  | <strong><span style="color: #FF0000">extern</span></strong> interface_nonansi_header
  | <strong><span style="color: #FF0000">extern</span></strong> interface_ansi_header

program_nonansi_header ::=
    {attribute_instance} <strong><span style="color: #FF0000">program</span></strong> [lifetime] program_identifier
        [parameter_port_list] list_of_ports<strong><span style="color: #FF0000">;</span></strong>

program_ansi_header ::=
    {attribute_instance} <strong><span style="color: #FF0000">program</span></strong> [lifetime] program_identifier
        [parameter_port_list] [list_of_port_declarations]<strong><span style="color: #FF0000">;</span></strong>

program_declaration ::=
    program_nonansi_header [timeunits_declaration] {program_item}
        <strong><span style="color: #FF0000">endprogram</span></strong> [<strong><span style="color: #FF0000">:</span></strong> program_identifier]
  | program_ansi_header [timeunits_declaration] {non_port_program_item}
        <strong><span style="color: #FF0000">endprogram</span></strong> [<strong><span style="color: #FF0000">:</span></strong> program_identifier]
  | {attribute_instance} program program_identifier <strong><span style="color: #FF0000">(.*);</span></strong>
        [timeunits_declaration] {program_item}
    <strong><span style="color: #FF0000">endprogram</span></strong> [<strong><span style="color: #FF0000">:</span></strong> program_identifier]
  | <strong><span style="color: #FF0000">extern</span></strong> program_nonansi_header
  | <strong><span style="color: #FF0000">extern</span></strong> program_ansi_header

class_declaration ::=
    [<strong><span style="color: #FF0000">virtual</span></strong>] <strong><span style="color: #FF0000">class</span></strong> [lifetime] class_identifier [parameter_port_list]
        [<strong><span style="color: #FF0000">extends</span></strong> class_type [<strong><span style="color: #FF0000">(</span></strong>list_of_arguments<strong><span style="color: #FF0000">)</span></strong>]]<strong><span style="color: #FF0000">;</span></strong>
        {class_item}
    <strong><span style="color: #FF0000">endclass</span></strong> [<strong><span style="color: #FF0000">:</span></strong> class_identifier]

package_declaration ::=
    {attribute_instance} <strong><span style="color: #FF0000">package</span></strong> package_identifier<strong><span style="color: #FF0000">;</span></strong>
        [timeunits_declaration] {{attribute_instance} package_item}
    <strong><span style="color: #FF0000">endpackage</span></strong> [<strong><span style="color: #FF0000">:</span></strong> package_identifier]

timeunits_declaration ::=
    <strong><span style="color: #FF0000">timeunit</span></strong> time_literal<strong><span style="color: #FF0000">;</span></strong>
  | <strong><span style="color: #FF0000">timeprecision</span></strong> time_literal<strong><span style="color: #FF0000">;</span></strong>
  | <strong><span style="color: #FF0000">timeunit</span></strong> time_literal<strong><span style="color: #FF0000">;</span></strong>
    <strong><span style="color: #FF0000">timeprecision</span></strong> time_literal<strong><span style="color: #FF0000">;</span></strong>
  | <strong><span style="color: #FF0000">timeprecision</span></strong> time_literal<strong><span style="color: #FF0000">;</span></strong>
    <strong><span style="color: #FF0000">timeunit</span></strong> time_literal<strong><span style="color: #FF0000">;</span></strong></pre></div></div>
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