赋值语句是Verilog HDL中对线型和寄存器型变量赋值的主要方式,根据赋值对象的不同分为连续赋值语句和过程赋值语句,两者的主要区别是: (1) 赋值对象不同: 连续赋值语句用于对线型变量的赋值;过程赋值语句完成对寄存器变量的赋值。 (2) 赋值过程实现方式不同:线型变量一旦被连续赋值语句赋值后,赋值语句右端表达式中的信号有任
In contrast, a SystemVerilog task executes a number of sequential statements but doesn’t return a value. Instead, the task can have an unlimited number of outputs . In addition to this,SystemVerilog functionsexecute immediately and can’t containtime consuming constructssuch as delays, posedge ma...
SystemVerilog 会等待,直到任何一个 forked processes 是完成的。fork join_any moduletb_top;initialbegin#1$display("[%0t ns] Start fork ...",$time);// Main Process: Fork these processes in parallel and wait untill any one of them finishfork// Thread1 : Print this statement after 5ns fro...
A primary goal of SystemVerilog is to enable modeling large, complex designs more concisely than was possible with Verilog. This chapter presented enhancements to the procedural statements in Verilog that help to achieve that goal. New operators, enhanced for loops, bottom-testing loops, and unique...
system verilog语法教程 Control Statements Verilog中的if, else, repeat, while, for, case看起来完全像C语言! 但是Verilog是HDL,我们需要用这些关键字来描述硬件,这意味着如果不小心对待这些控制语句,我们的硬件可能会出现问题。 If-else if-else语句根据不同的条件来决定是否执行哪一部分代码。
静态线程指的是从仿真一开始就一直存在的线程,它的创建方式就是使用initial过程块或者always过程块(包括always, always_comb, always_ff等)。这在使用Verilog等硬件描述语言做设计的时候就涉及到了。仿真的时候调度器(systemverilog scheduler)会根据敏感信号列表等触发事件来对线程进行调度执行。
Function cannot have timing event (time-controlled statements like @, #, fork join or wait) and cannot call a task since tasks are allowed to consume simulation time in SystemVerilog. Latest changes have allowed functions to use fork…join and use timing event inside fork block. Note: It is...
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_...
When using this type of code in SystemVerilog, we should take care to limit the number of nested statements as it can lead to difficulties in meeting timing. If Statement Example We have already seen a practical example of the if statement when modelling flip flops and latches in the post...
enum {WAIT=2’b01, LOAD, DONE} states; 我们还可以使用typedef为枚举类型指定一个名字,从而允许这个枚举类型可以在许多地方使用。例如: typedef enum {FALSE=1’b0, TRUE} boolean; boolean ready; boolean test_complete; 6,结构体和联合体 在Verilog语言中不存在结构体或联合体,而结构体或联合体在将几个声...