求翻译：目前VLSI系统设计最流行的是自顶向下的结构设计。它的基本策略是将一个复杂系统的功能分成可以独立设计的简单部分，然后将各部分拼接起来，就可完成整个系统的设计。实际上就是模块化的结构设计。但是仅用结构设计法减少VLSI设计复杂性还是有限的，通常普遍采用的策略是“约束设计法”。约束设计能增加可靠性和简单性，但要付出降低芯片某些性能的代。因此，采用何种设计方法和约束条件，主要是均衡设计的复杂性和所设计芯片对性能的要求两者之间的关系。设计者应根据不同芯片的不同要求，确定采用哪种设计方法和约束条件。是什么意思？

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Currently VLSI system design to the most popular, top-down design. It will be the basic strategy is a complex system can be divided into the features of the independent design simple, and then the pieces together, you can complete the entire system's design. In fact, modular construction design. But

Current VLSI system design was the most popular top-down structure design. Its basic strategy is a complex system into simple parts that can be designed independently, and then splicing the various parts together, you can complete the design of the system as a whole. Is actually a modular structure