set_clock_uncertainty -fall_from [get_clocks {clk125}] -fall_to [get_clocks {clk125}] -setup 0.003 set_clock_uncertainty -rise_from [get_clocks {clk125}] -rise_to [get_clocks {clk125}] -hold 0.003 set_clock_uncertainty -rise_from [get_clocks {clk125}] -fall_to [get_clocks ...
2,set_clock_uncertainty可以理解为clock skew即在pre-layout时模拟cts之后,由于插入buffer、数据路径长度不同,而引起的clock到各个寄存器时钟输入端延迟时间不同。在pre-layout包含jitter+clock,post-layout只能用jitterset_clock_uncertainty value[-from object_list -to object_list][-rise] [-fall][-setup] [-...
一、序言 在时序约束中,对时钟的约束除了set clock latency,set clock uncertainty,set input jitter外,还有一条set bus skew的约束命令。该命令主要用于跨时钟域的场景中,下面将对set bus skew的使用进行详细…
在时序约束中,对时钟的约束除了set clock latency,set clock uncertainty,set input jitter外,还有一条set bus skew的约束命令。该命令主要用于跨时钟域的场景中,下面将对set bus skew的使用进行详细的介绍。 二、Set Bus Skew 2.1 基本概念 Set Bus Skew用于在多个跨时钟域路径中设置一个最大的偏斜要求,可以限制...
2.4.1.6.1. Set Clock Latency (set_clock_latency) 2.4.1.6.2. Clock Uncertainty 2.4.1.7. Constraining CDC Paths 2.4.2. I/O Constraints 2.4.3. Delay and Skew Constraints 2.4.4. Timing Exception Constraints 2.4.5. Delay Annotation 2.5. Timing Report Descriptions ...
Max skew analysis can include data arrival times, clock arrival times, register micro parameters, clock uncertainty, on-die variation, and ccpp removal. Among these, only ccpp removal disables during the Fitter by default. When you use-include, the default analysis includes those in the inclusion...
Set capacitance on output ports and output pins Syntax set_load [‑rise] [‑fall] [‑max] [‑min] [‑quiet] [‑verbose] <capacitance> <objects> Usage Name Description [-rise] Specify the rise capacitance value (for ports only) [-fall] Spe
While a senior may have already prudently paid off their mortgage, property taxes will rise with new home prices and can take a large chunk of income each year. Worse, property taxes do not fall as rapidly as home prices decline, impacting the budget for many years. ...
Maximum skew analysis can include data arrival times, clock arrival times, register micro parameters, clock uncertainty, on-die variation, and clock pessimism removal. Among these, the Fitter only disables clock pessimism removal by default.
Figure 2 indicates that the rank of sustainable use of water resources in Beijing from 2004 to 2015, is on the rise in general, but there has been a dramatic fluctuation from 2004 to 2007. The reasons can be elaborated as follows: In 2004, the situation of sustainable use of water resour...