只能与asynchronous一起使用,使得针对一些异步路径设置的约束如max/min delay 生效 [-name name] [-group clock_list] 2.Clock relation 设计中存在多个时钟,静态时序分析工具,会同时考虑多个时钟的互相作用。从工具给出的结果,部分分析是没有必要的,这个时候需要将不同时钟之间的关系定义清楚,那些分析是false path。
基于block level的设计进行时序分析,如果在SDC和flow脚本中对clock 没有设置source clock latency 和network clock latency,在ccopt之前clock模式是ideal的,所有的clock latency都是按照0计算。 当cts完成之后,clock模式切换为propagate ,工具会计算到达每个sink 点的clock latency 长度,但是工具依然看不到IO port上的cloc...
网络时钟网络延时 网络释义 1. 时钟网络延时 看到了吧,这时候的锁存沿(latch clock,即SDRAMCLK)的时钟网络延时(Clock network delay)就是图1中看到的1.567ns … blog.chinaaet.com|基于6个网页
set_clock_sense 问:在non-unate的clock network中,怎么分析时钟? 答:可以通过命令set_clock_sense来设置需要分析的clock的sense。 比如: set_clock_sense -stop_propagation: 表示时钟physically上不会进行propagate。 set_clock_sense -logical_stop_propagation: 表示clock可能会作为data继续进行propagate,但是不会作为...
1、首先需要打开clocknetworkdelay软件网站。2、其次进入该网站内部，找到设置。3、最后只要是在设置里面进行设置自己想要的即可。
Clock synchronization for network measurements with clock resets Several algorithms are provided to estimate and remove relative clock skews from delay measurements based on the computation of convex hulls. The algorithms are linear in the number of measurement points for the case with no clock resets...
Note that negative clock skew may be used to effectively speed up a local data path Ri Rf by allowing an additional TSkew(i, f) amount of time for the signal to propagate from the register Ri to the register Rf. However, excessive negative skew may create a hold-time violation, thereby...
(rise edge) 1.26 1.26 **clock network delay (propagated)** 0.67 0.00 1.26 ^ _897_/CLK (sky130_fd_sc_hd__dfxtp_1) 0.10 0.87 2.13 v _897_/Q (sky130_fd_sc_hd__dfxtp_1) 3 0.01 uart_rx_inst.prescale_reg[0] (net) 0.10 0.00 2.13 v _485_/B (sky130_fd_sc_hd__or2_1) ...
the clock network delay time = pin delay time + routing delay time we can get the pin delay time from the third pic, is 1.163ns, and also we can get the routing delay time from the second pic, is 1.600ns. now the problem comes, the equal is wrong, or i...
When the switchover event occurs, a low-bandwidth PLL propagates the stopping of the clock to the output more slowly than the high-bandwidth PLL. However, be aware that the low-bandwidth PLL also increases lock time. July 2012 Altera Corporation Arria II Device Handbook Volume 1: Device ...