This example shows how simple it is to model a multiplexor using the case statement in SystemVerilog. In fact, the case statement provides the most intuitive way of modelling a multiplexor in SystemVerilog. Although this example is quite straight forward, there are a few important points which ...
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,也没有给出缺省语句,执行将不...
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....
The second example of Verilog X optimism is acasestatement: always_ff @(posedge clk) begin case (cond) 1'b0 : c = a; 1'b1 : c = b; endcase end X logic value in the select input actually causescto retain the value of the previous clock, a completely different behaviour than the ...
(2)case 语句 case语句为程序提供了分支选择控制的功能。case要求分之表达式和case条件表达式做全等比较(===)而不是逻辑比较(==)。一个分支只有在其表达式完全匹配case条件语句表达式时,才会被选中执行。 case(expression) constant_expression:statement_block; ...
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...
SNUG2005 Israel Rev 1.0 4 SystemVerilog's priority & unique - A Solution to Verilog's "full_case" & "parallel_case" Evil Twins! The examples in this section includes the case statement report that is generated when DC reads each Verilog example. For a description of the meaning of the ...
randcaseitem:statement;...endcase Example The sum of all weights is 9, and hence the probability of taking the first branch is 1/9 or 11.11%, the probability of taking the second branch is 5/9 or 55.56% and the probability of taking the last branch is 3/9 or 33.33%. ...
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 synthesis examples SystemVerilog FSM Design Techniques - Six different FSM coding styles, enhanc...