英文:
Use of Item in coverpoint
问题
在下面的代码中，有人可以解释一下 "item" 指的是什么吗？
covergroup cg(bit ip);
coverpoint txn_type {
bins T0 = {0};
bins T1 = {1};
bins T2 = {2} with (((item || (!item)) && ip) == 1);
}
endgroup
英文:
In the below code, can someone please explain what "item" refers to?
covergroup cg(bit ip);
coverpoint txn_type {
bins T0 = {0};
bins T1 = {1};
bins T2 = {2} with (((item || (!item)) && ip) == 1);
}
endgroup
答案1
得分: 2
请参考IEEE标准1800-2017，查阅第19.5.1.1节 使用covergroup表达式的Coverpoint bin：
with 子句指定仅包括满足给定表达式的 covergroup_range_list 中的值（即表达式求值为真，如12.4节所述）。在表达式中，名称 item 用于代表候选值。候选值与coverpoint的类型相同。
将 item 视为在 with 结构中隐式声明的变量。在您的代码中，item 代表coverpoint变量 txn_type。
英文:
Always start with the IEEE Std, 1800-2017. Refer to section 19.5.1.1 Coverpoint bin with covergroup expressions:
> The with clause specifies that only those values in the
> covergroup_range_list that satisfy the given expression (i.e., for
> which the expression evaluates to true, as described in 12.4) are
> included in the bin. In the expression, the name item shall be used to
> represent the candidate value. The candidate value is of the same type
> as the coverpoint.
Think of item as an implicitly-declared variable used in the with construct. In your code, item represents the coverpoint variable, txn_type.
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