In order to exactly describe logic relations among objects of discrete event control systems and write programs, a rule-based language, logic rule Description language (LRDL) is put forward.
为了准确描述离散事件控制系统对象之间的逻辑关系和编写控制程序，提出了一种基于规则的语言——逻辑规则描述语言(LRDL)。
Every kind of hardware description language adopted discrete event of system modeling of grammar.
每一种硬件描述语言都采用了离散事件语法对系统进行建模。
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