$past(表达式/信号,过去N个周期,采样事件)。 $rose/$fell/$stable 可以做过程块语句和连续赋值语句中用(有返回值是function),不能在类中(类中无法指定时钟) $countbit(表达式,bit一个数)计算几位数和表达式相同,$countbit(表达式,1)相当于$countones计算表达式中1的个数 $onehot(表达式)计算表达式是否只有1...
a19:assertproperty(p19); 带时钟门控的$past构造 “$past”构造可以由一个门控信号(gating singal)控制。比如,在一个给定的时钟沿,只有当门控信号的值为真时才检查后续算子的情况。使用门控信号的$past构造的基本语法如下: $past(signal_name, number of clock cycles,gating signal) 属性p20与属性p19相似。
a19:assertproperty(p19); 带时钟门控的$past构造 “$past”构造可以由一个门控信号(gating singal)控制。比如,在一个给定的时钟沿,只有当门控信号的值为真时才检查后续算子的情况。使用门控信号的$past构造的基本语法如下: $past(signal_name, number of clock cycles,gating signal) 属性p20与属性p19相似。
我们可以这样写断言: no_grant_ok:assertproperty(@(posedgeclk)(|gnt)||!$past(|req)); 此断言检查所需的条件。req和gnt值都是在clk的正边沿之前采样的,而$past函数在一个周期之前检查其参数的值。这些函数都继承了它们的断言语句、序列或属性使用的时钟,尽管它们也可能被传递显式的时钟参数。 使用这些函数...
在序列中使用“if..else”语句进行条件判断，同时“seq.ended”表示检查序列是否结束。函数如“$rose()”、“$fell()”、“not”、“$stable”、“$past”提供关于信号变化和稳定性的信息。计算位数、唯一位或未知位的函数如“$countbit”、“$onehot”、“$isunknown”简化了表达式处理。在多时钟...
or directly from Late Latin assertionem (nominative assertio), noun of action from past participle stem of Latin asserere "claim rights over something, state, maintain, affirm," from ad- "to" (see ad-) + serere "join" (see series). By "joining oneself" to a particular view, one "...
assertion Thesaurus Encyclopedia Wikipedia as·ser·tion (ə-sûr′shən) n. 1.The act of asserting. 2.Something declared or stated positively, often with no support or attempt at proof. as·ser′tion·aladj. American Heritage® Dictionary of the English Language, Fifth Edition. Copyrigh...
xx：问号表达式与c相同。`define true 1:利用true表达式可实现序列延时n个周期。$past(signal_name, number of clock cycles，[gating signal]):用来检测n个时钟周期之前逻辑表达式的值。Signal or sequence [*n] 连续重复 Signal [->n]：跟随重复(在其后必须有一个信号使得最后一次重复有效发生在其后逻辑发生 ...
$past(expr,n) Like $past(expr), but look n clocks earlier instead of one $rose(expr) Returns 1 iff LSBa of sampled value of expr is 1, and one clock earlier it was non-1 $fell(expr) Returns 1 iff LSB of sampled value of expr is 0, and one clock earlier it was non-0 $sta...
In the past several years there has been an increasing amount of both popular and professional attention to the area of assertive behavior. Popular books, articles, and newspaper articles on assertion have proliferated (e.g., Alberti & Emmons, 1978; Bower & Bower, 1976; M. D. Galassi & ...