几乎很少有设计师会考虑使用分级设计方法来开发复杂芯片的种种好处。从历史上看,设计师都使用一种芯片分级设计法-把芯片分成几个区或功能块-来扩展设计自动化工具的能力。使用分级设计法的优点是能实现并行的RTL(寄存器传输级)和物理设计,因为物理设计可以在网表完成前就开始进行。分级设计还可以在一块芯片上使用多个电源区。此外,分级设计有助于对局部块进行最后一分钟的设计修 Few designers will consider the benefits of using a hierarchical design approach to developing complex chips. Historically, designers have used a chip-scale design approach-dividing the chip into blocks or blocks-to extend the ability to design automation tools. The advantage of using hierarchical design is that it enables parallel RTL (register transfer level) and physical design because the physical design can begin before the netlist is completed. Hierarchical designs can also use multiple power zones on a single chip. In addition, the hierarchical design helps to design the final minute of the local block