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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 源文本</div>
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constraint_declaration ::= [ static ] constraint constraint_identifier constraint_block<br>constraint_block ::= { { constraint_block_item } }<br>constraint_block_item ::=<br>solve identifier_list before identifier_list ;<br>| constraint_expression<br>constraint_expression ::=<br>expression_or_dist ;<br>| expression –&gt; constraint_set<br>| if ( expression ) constraint_set [ else constraint_set ]<br>| foreach ( array_identifier [ loop_variables ] ) constraint_set<br>constraint_set ::=<br>constraint_expression<br>| { { constraint_expression } }<br>dist_list ::= dist_item { , dist_item }<br>dist_item ::= value_range [ dist_weight ]<br>dist_weight ::=<br>:= expression<br>| :/ expression<br>constraint_prototype ::= [ static ] constraint constraint_identifier ;<br>extern_constraint_declaration ::=<br>[ static ] constraint class_scope constraint_identifier constraint_block<br>identifier_list ::= identifier... <a href="00618.html" target="topic">more</a>&nbsp;</div></td></tr><tr>
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package_item ::=<br>package_or_generate_item_declaration<br>| specparam_declaration<br>| anonymous_program<br>| timeunits_declaration18<br>package_or_generate_item_declaration ::=<br>net_declaration<br>| data_declaration<br>| task_declaration<br>| function_declaration<br>| dpi_import_export<br>| extern_constraint_declaration<br>| class_declaration<br>| class_constructor_declaration<br>| parameter_declaration ;<br>| local_parameter_declaration<br>| covergroup_declaration<br>| overload_declaration<br>| concurrent_assertion_item_declaration<br>| ;<br>anonymous_program ::= program ; { anonymous_program_item } endprogram<br>anonymous_program_item ::=<br>task_declaration<br>| function_declaration<br>| class_declaration<br>| covergroup_declaration<br>| class_constructor_declaration<br>| ;&nbsp;</div></td></tr></table></div></div>
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