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...
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 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 >= $past(fifo_level)); endproperty ...
assertion定义在tb_assertion.v文件中,在仿真时定义ASSERTION_ENABLE的宏,可以调用assertion检查。 tb_assertion.v定义为: check_req_ack_rise:assertproperty(@(posedge clk) disable iff (rst)$rose(req) |- >##1 (req & ~ack)[*0:$] ##1 (req & ack))else$error("req to ack rising edge is fai...
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 ...
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 ...
system_verilog_assertion 1什么是断言：断言就是在模拟过程中根据我们事先安排好的逻辑是不是发生了,如果发生断言成功，否则断言失败。2断言的执行分为：预备（preponed）观察(observed)响应(reactive).3断言的分类：并发断言（基于时钟）和即时断言（基于语义）。4SVA（system Verilog assertions）：块的建立：序列：Se...
SystemVerilogAssertions(SVA) Ming-HwaWang,Ph.D. COEN207SoC(System-on-Chip)Verification DepartmentofComputerEngineering SantaClaraUniversity Introduction •Assertionsareprimarilyusedtovalidatethebehaviorofadesign •Pieceofverificationcodethatmonitorsadesignimplementationfor ...
Assertion System Functions SystemVerilog provides a number of system functions, which can be used in assertions. $rose,$felland$stableindicate whether or not the value of an expression has changed between two adjacent clock ticks. For example, assert property ...