WitrynaCommon Multicycle Applications. Multicycle exceptions adjust the timing requirements for a register-to-register path, allowing the Fitter to optimally place and route a design. Two common multicycle applications are relaxing setup to allow a slower data transfer rate, and altering the setup to account for a phase shift. 3.6.8.4. WitrynaYou can use the -logically_exclusive option to declare that two clocks are physically active simultaneously, but the two clocks are not actively used at the same time (that …
set_clock_groups (::quartus::sdc) - Intel
Witryna3.6.1.3. Derive Clock Uncertainty (derive_clock_uncertainty) The Derive Clock Uncertainty ( derive_clock_uncertainty) constraint applies setup and hold clock uncertainty for clock-to-clock transfers in the design. This uncertainty represents characteristics like PLL jitter, clock tree jitter, and other factors of uncertainty. WitrynaMulticycle Clock Setup. 2.2.5.2. Multicycle Clock Setup. The setup relationship is the number of clock periods between the latch edge and the launch edge. By default, the Timing Analyzer performs a single-cycle path analysis, which results in the setup relationship being equal to one clock period (latch edge – launch edge). thinner 4000
时序分析基本概念介绍 - 搜狐
WitrynaIn Synchronous clocks, events happen at a fixed phase relation whereas in asynchronous clocks that is untrue. Then there are logically exclusive clocks, which are passed through a mux logic, whereas in physically exclusive clocks, the sources are entirely different. set_clock_groups is used for establishing asynchronous and … Witrynaset_clock_groups -logically_exclusive -physically_exclusive -asynchronous -group [get_clocks clkname -include_generated_clocks] 1、逻辑互斥：对于设计中使用MUX时使用. 2、物理互斥: 对于设计中没有路径交互、完全独立时使用 Witryna15 lip 2024 · 李锐博恩 发表于 2024/07/15 04:32:30. 【摘要】 Vivado会分析所有XDC约束时钟间的时序路径。. 通过set_clock_groups约束不同的时钟组 (clock group)，Vivado在时序分析时，当source clock和destination clock属于同一个时钟组时，才会分析此时序路径；而source clock和destination clock属于不 ... thinner 4175