If multiple statements need to be placed inside the if or else part, it needs to be enclosed within begin and end. if ([expression]) Single statement // Use "begin" and "end" blocks for more than 1 statements if ([expression]) begin Multiple statements end // Use else to execute sta...
也就是需要在下面的语句里加入if else语句，具体的实现如下：第一种：always @（*）begin［multiple s...
if ([expression]) Single statement // using "begin" and "end" blocks for more than 1 statements if ([expression]) begin Multiple statement end // using else to execute statements for which expression is false if ([expression]) begin Multiple statements end else begin Multiple statements end ...
// Use "begin" and "end" blocks for more than 1 statements if ([expression]) begin Multiple statements end // if statment with an else part if (expression) [statement] else [statement] // if else for multiple statements should be // enclosed within "begin" and "end" if (expression)...
elseif(expression)[statement] else [statement] case语句 //Here 'expression'should match one of the items case(<exoression>)case_item1:<single statement>case_item2,case_item3:<single statement>case_item4:begin <multiple statements>enddefault:<statement>endcase ...
1always @(event)2[statement]3always @event begin4[multiple statements]5end 不带有敏感信号的 always 语句块会一直执行➢ 可用于仿真时钟信号生成 1always #10clk=~clk; always设计组合电路代码示例: 1 module combo (input a, b, c, d, e, ...
[multiple statements] end 1. 2. 3. 例如我们描述一个同步复位的D触发器,可以这样描述: always@(posedge i_clk) begin if(i_rst) begin q <= 0; end else begin q <= d; end end 1. 2. 3. 4. 5. 6. 7. 8. 这表示当检测到时钟上升沿时,判断是否复位有效,如果有效对输出复位,否则采样输入...
always @ (edge eventa or edge eventb) begin[multiple statements]end 其中edge可以是negedge(下降沿)和posedge(上升沿)。 组合逻辑通常用来监听信号水平事件的发生。当敏感信号出现电平的变化时就会执行always语句。例如always @(a or b or c),a、b、c均为变量,当其中一个发生变化时都会执行后续代码。例如:...
always @(event) [statement] always @ (event) begin [multiple statements] end 敏感列表(event):定义触发 always 块执行的事件。可以是单个信号或多个信号,用 or 关键字连接。如果敏感列表为空,则 always 块会在仿真过程中连续重复执行。 语句块:包含要在 always 块中执行的语句。如果只有一条语句,可以省略...
其中event是敏感信号,也就是敏感信号发生变化或者event发生就会触发[multiple statements]执行,在组合逻辑中可以用到always,时序逻辑中必用到always: 注意always块中的被赋值对象必须是reg型; // eg7:always module Learn_Verilog( input clk, input in1, in2, output wire out_assign, output reg out_always_comb...