断言(Assertion)是设计的属性的描述。 如果一个在模拟中被检查的属性(property)不像我们期望的那样表现,那么这个断言失败。 如果一个被禁止在设计中出现的属性在模拟过程中发生,那么这个断言失败。 断言可以放在RTL设计或验证平台中,方便在仿真时查看异常情况。一般在数字电路设计中都要加入断言,断言占整个设计的比例应...
Assertion Examples¶ Here is a set of commonly used code patterns which represent how assertions can be used. // FIFO level cannot go down without a pop. property FifoLevelCheck; @(posedge clk) disable iff (rst) (!rd_vld) |-> ##1 (fifo_level >= $past(fifo_level)); endproperty ...
作者:白栎旸 断言assertion被放在verilog设计中,方便在仿真时查看异常情况。当异常出现时,断言会报警。一般在数字电路设计中都要加入断言,断言占整个设计的比例应不少于30%。以下是断言的语法: 1. SVA的插入位置:在一个.v文件中: module ABC (); rtl 代码 SVA断言 endmodule 注意:不要将SVA写在enmodule外面。
1.sv出现之前就有assertion,最早是软件上使用 2.硬件的assertion比软件上更复杂 3.他和sv其实挺独立的,所以sv的书不讲SVA 4.systemverilog 应用指南,总共5章,细节可以参考此书。 5.在tb中,激励和检查应该独立,所以assertion是做检查的工具。 6.实际仿真中如果过多的使用$,会拖慢仿真速度。 7.sequence和propert...
assertion定义在tb_assertion.v文件中,在仿真时定义ASSERTION_ENABLE的宏,可以调用assertion检查。 tb_assertion.v定义为: check_req_ack_rise:assertproperty(@(posedge clk) disable iff (rst)$rose(req) |- >##1 (req & ~ack)[*0:$] ##1 (req & ack))else$error("req to ack rising edge is fai...
As evident from the two examples above,propertiesof a given design is checked for by writing SystemVerilog assertions. Why do we need assertions ? An assertion is nothing but a more concise representation of a functional checker. The functionality represented by an assertion can also be written ...
SystemVerilog AssertionPart 2: Sequence - An IntroductionPrev: Boolean Expression Layer | Next: Sequence and Clock In Part 1 of this series, we saw how an immediate assertion is useful for checking condition at a given instance of time, and also how a concurrent assertion checks for a ...
system verilog assertion for 循环 目录 一、verilog循环语句: (1)while循环 (2)for循环 (3)repeat循环 (4)forever循环 二、always块与assign不能共存 三、generate语句 generate_for语句 generate_if语句 generate_case语句 一、verilog循环语句: (1)while循环...
SystemVerilog Assertion Example A concise description of complex behaviour: After request is asserted, acknowledge must come 1 to 3 cycles later 0 1 2 3 4 5 req ack assert property( @(posedge clk) $rose(req) |-> ##[1:3] $rose(ack)); Properties and Assertions Types of SV...
SystemVerilog has integrated a set of constructs that helps you to build assertions and closely couple them with the rest of your design or verification code. One of the main features of SystemVerilog assertion constructs is that they are part of the language itself. This means you can use ...