Case statements in Verilog are nearly equivalent to a sequence ofif-elseif-elsethat compares one expression to a list of others. Its syntaxandfunctionality differs from the switch statement in C. Always case - HDLBits (01xz.net) 1//synthesis verilog_input_version verilog_20012moduletop_module ...
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. SystemVerilog Case Statement We use the SystemVerilog case statement to select...
“随着综合工具的进步,已经不需要讨论if-else 和case的区别了,两者可以等同 ” “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 di...
下面是用system verilog中的unique关键字修饰case综合 unique关键字的case 并行assign代码、结果如下 assignout=((sel==3'b001)&in[0])|((sel==3'b010)&in[1])|((sel==3'b011)&in[2])|((sel==3'b100)&in[3])|((sel==3'b101)&in[4])|((sel!=3'b001)&(sel!=3'b010)&(sel!=3'b011)...
Dear all, 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&
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
// 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 statement> endcase 如果没有一个case项与给定的表达式匹配,则...
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。
Verilog定义了case,casez和casex语句,用于做多种情况下的选择语句。 reg [1:0] sel; reg [2:0] result; always @(*) case(sel) 2’b00: result = 3’d0; 2’b01: result = 3’d1; 2’b10: result = 3’d2; endcase 使用case语句代替嵌套的if-else将会产生更易读的代码,更好的逻辑利用率和更...
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...