一个由多个语句组成的块必须分组,并且位于begin和end之间。 // Here 'expression' should match one of the items (item 1,2,3,or 4) case(<expression>) case_item1: <single statement> case_item2: case_item3: <single statement> case_item4: begin <multiple statement> end default: <single stat...
It is also possible for us to use an else-if type statement here but the else statement is more succinct. The behaviour is the same in both cases as the signal can only ever be 0b or 1b in a real circuit. Verilog Case Statement We use the verilog case statement to select a block ...
在Verilog中,case语句是一种强大的流程控制结构,特别适用于实现组合逻辑。以下是对Verilog中case语句的基本语法、用途、示例以及其在组合逻辑设计中的应用的详细解释。 1. Verilog中case语句的基本语法和用途 case语句的基本语法如下: verilog case (expression) value1: statement1; value2: statement2; ... default...
I am trying to generate a state machine where no' of states depends on the parameter, so how can I write a verilog code for this variable no' of states. I tried writing using generate statement here 'rep' is a parameter generate for(j=0;j<rep-1;j\+\+) begin:statemachine j\...
The case statement checks if the given expression matches one of the other expressions in the list and branches accordingly. It is typically used to implement a multiplexer. The if-else construct may not be suitable if there are many conditions to be che
default : <statement> endcase 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 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,执行将不做任何事情就退出case块。
When the number of the nesting grows, it becomes difficult to understand the if else statement. The verilog case statement, comes handy in such cases. We will first look at the usage of the case statement and then learn about its syntax and variations. ...
当条件不互斥的时候,case和if会综合出带优先级的电路,对于case来说,如果 condition1 为真,则执行 true_statement1 ; 如果 condition1 为假,condition2 为真,则执行 true_statement2;依次类推。如果各个 condition 都不为真,则执行 default_statement 语句。后续仿真会体现上述内容。
“Verilog 2001标准(IEEE 1364-2001)第132页: The case item expressions shall be evaluated and compared in the exact order in which they are given. 指出了case是串行有优先级。又: Apart from syntax, the case statement differs from the multiway if-else-if construct in two important ways: ...
Verilogcase语句由下面的语句组成: • case:指定要测试的变量。 • when:用于指定每个案例的值。 • Default:用于指定默认情况下应采取的actioin。 • endcase:标记case结束的语句。 • 操作符:包括等于,不等于,比较和逻辑运算符。 verilogcase语句格式如下: Case (variable) When condition1: statement1...