Google Bard：可以使用以下 property 来实现该需求：property p1; @(posedge clk) begin if (a == 2) begin // 信号 c 或 d 先于信号 b 为高电平assert property (c | d ##1 b); end end endproperty;该 property 的含义是：在 clk
sequence块和property块都有name,使用assert调用时都是:“assert property(name);” 在SVA中,sequence块一般用来定义组合逻辑断言,而property一般用来定义一个有时间观念的断言,它会常常调用sequence,一些时序操作如“|->”只能用于property就是这个原因。 注:以下介绍的SVA语法,既可以写在sequence中,也可以写在property...
2、 尽量使用并发断言,因为现在大部分的电路都是同步设计,并发断言能够减少采样次数,提高仿真效率。 3、 使用一个宏文件定义assert property。因为就像前文提到的“如果一个设计人员不得不书写超过3行的SVA代码,这个工作肯定会迅速转到验证工程师身上”。正确的做法应该如下图所示: 通过上述这个宏定义,就可以将断言 ...
a1:assumeproperty(@(posedgeclk)reqdist{0:=40,1:=60});//req为0的权重比是40,为1的权重比是60propertyproto;@(posedgeclk)req|->req[*1:$]##0ack;endproperty 这等价于以下内容: a1_assertion:assertproperty(@(posedgeclk)reqinside{0,1});//req可以取0或者1propertyproto_assertion;@(posedgeclk)...
暑期实习两个月的其中一个任务是:如何在设计中加入断言?以及断言的基本语法、三种应用场景下的断言(如FIFO、FSM、AXI4-lite总线)。参考书籍:《System Verilog Assertion 应用指南》 一、SVA介绍 1.1断言的定义 An assertion is a statement that a given property is required to be true, and a directive to ve...
It has been shown in [8] that every property in PSL and SVA can be converted to an equivalent finite automaton in a recursive manner. An assertion violation signals triggers whenever an automaton representing an assertion reaches its final state. For instance, the violation signal of our ...
In all the examples shown so far, the property is checking for a true condition. we expect the property to be false always. If the property is true, the assertion fails. sequence seq; a ##2 b; endsequence a_2: assert property(@(posedge clk) seq); ...
In the case of our arbiter, a simple example might be the fact that you never expect a grant to agent 0 when it was not requested: check_grant: assert property (!(gnt[0] && !req[0])) else $error(“Grant without request for agent 0!”); As we will see in the discussions below...
intelligently in SVA 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 ...
3. 7 PSL built-in functions 82 3. 4Pragma-based assertions 82 3. 5 SystemVerilog assertions 84 3. 5. 1 Immediate assertions 84 3. 5. 2Concurrent assertions 86 3. 5. 3 System functions 95 3. 6 PCI property specification example 96 3. 6. 1 PCI overview 96 3. 7 Summary 102 ...