Many designers are familiar with setup and hold time definitions - however, few can identify correctly the launch and capture edges and the slack/violation between two flops during timing analysis. In this post, we will cover setup/hold times in a design with clear examples. Setup time ...
转载 http://bb2hh.blogbus.com/logs/21015786.html 在讲多周期路径之前,先看下单频率路径的建立关系和保持关系 『Design Compiler calculates the default setup and hold relations and derives single-cycle timing, based on active edges.』 1.对于startpoint,active edge是寄存器的open edge。 2.对于endpoint ...
转载http://bb2hh.blogbus.com/logs/20756952.html ic代码的综合过程可以说就是时序分析过程,dc会将设计打散成一个个路经,这些路经上有cell延迟和net延迟,然后dc会根据你加的约束,来 映射库中符合这种延迟以及驱动的器件。从而达到综合的目的。dc的所有时序约束基础差不多就是setup time 和 hold time。 可以用下面 ...