case_item2, case_item3 : <single statement> case_item4 : begin <multiple statements> end default : <statement> endcase 如果所有的 case 项都不符合给定的表达式,则执行缺省项内的语句,缺省语句是可选的,在case语句中只能有一条缺省语句。case 语句可以嵌套。 如果没有符合表达式的项目,也没有给出缺省...
unique0 case: similar to unique case, but it does not report error if no items match the expression. Similarly, there are priority and unique if-else-if statement. Casez Casex Case Addition: Reverse Case Statement The case(1′b1) in Verilog is sometimes known as the reverse case statement....
SystemVerilog中的unique和priority关键字修饰符放在if,case,casez,casex语句之前。表示在一系列条件选项中,有且仅有一项是符合条件的,否则警告 代码语言:javascript 代码运行次数:0 运行 AI代码解释 1uniqueif(expression)2statements3else4statements56prioritycase(case_expression)7case_item_1:case_expression_18case_...
31.37 Atomic Statement (supersedes IEEE 1364-2001 26.6.27)31.38 If, if else, return, case, do while (supersedes IEEE 1364-2001 26.6.35, 26.6.36)31.39 waits, disables, expect, foreach (supersedes IEEE 1364 26.6.38)31.40 Simple expressions (supersedes IEEE 1364-2001 26.6.25)31.41 Expressions...
A SystemVerilog case statement checks whether an expression matches one of a number of expressions and branches appropriately. The behavior is the same as in Verilog. Click here to learn about Verilog case statements ! unique,unique0 case All case stat
2.0 Verilog & SystemVerilog case statement modifiers Before going into detail about all of the case statement modifiers, we should look at the big picture as it relates to full_case, parallel_case, priority and unique. First ask yourself the questions: Why are the full_case parallel_case ...
例如：Copy code unique case (expression) value1: statement1; value2: statement2; value3...
Conventional wisdom would be that both code examples should behave and execute the same way. However, that is not always the case! There is a clause in the SystemVerilog language manual that defines the implicit sensitivity list of analways_combblock. It states that any expression that is writ...
full_case parallel_case, "the Evil Twins" What is full_case? What is parallel_case? unique & priority case unique & priority if unique0 (SystemVerilog-2009 enhancement) Three examples using case modifiers * LABS: simple SystemVerilog combinational and sequential logic labs * Multiple small synth...
31.37 Atomic Statement (supersedes IEEE 1364-2001 26.6.27) ..44331.38 If, if else, return, case, do while (supersedes IEEE 1364-2001 26.6.35, 26.6.36)...44431.39 waits, disables, expect, foreach (supersedes IEEE 1364 26.6.38) ...44531.40 Simple expressions (supersedes IEEE 1364-2001 ...