A setup time of a single device propagation delay is provided for a received enable signal. When each of a clock signal, the enable signal and a delayed clock signal is asserted, an evaluate node of the clock gating circuit is discharged. When each of the clock signal and a second clock...
Discrete Clock Gate:需要考虑latch与AND的skew最小值,将latch clock pin设置为non stop pin属性,需要设置setup/hold time, 这会增加flow的复杂性。 Integrated Clock Gate:不需要考虑latch与AND的skew值,CTS和timing analysis 工具自动处理,setup/hold time信息在library中。 AND Type:如果EN信号来自上升沿触发器,则...
即UAND/A的信号的变化窗口为5-10ns, clock gating setup check时需要UAND0/A在CLKB上升沿之前变,clock gating hold check时需要UAND0/A在CLKB下降沿之后变。PT工具在进行setup/hold gating check时,如果library中没有定义gating cell的setup和hold time,工具会将setup与hold设置为0。我们也可以使用set_clock_...
在实际芯片中,时钟网络除了包含inv和buffer,还包含clock gating。 例如,如果时钟信号作为逻辑AND门的一个输入,控制信号用作另一个输入,输出就是门控时钟信号 对于上述基于AND门的clock gating,该工具不会自动检查该门控时钟的setup和hold time。此时,时序不满足要求,可能会产生不完整的时钟信号。 要检查这种门控时钟...
些问题,如下图所示clock_gating_controlling_edge_unknown:指clockgatecell是一些比较复杂的cell,类似MUX或者AOI电路...干扰)的问题,在clockgate的检查中,setup和holdcheck没法保证生成正确的clock信号。clock_clipping_gate: 不合适的gate类型 低功耗之门控时钟设计 ...
秒杀数字后端实现中clock gating使能端setup violation问题 数字芯片设计实现中修复setup违例的方法汇总 深入浅出讲透set_multicycle_path,从此彻底掌握它 Hold影响 由于hold check是同沿检查。因此clock jitter对hold没有影响。因此在芯片timing signoff时,往往hold 的uncertainty会比较小。
CLOCK GATING CELL FOR LOW SETUP TIME FOR HIGH FREQ 优质文献 相似文献DCG: Deterministic clock-gating for low-power microprocessor design With the scaling of technology and the need for higher performance and more functionality, power dissipation is becoming a major bottleneck for microproces... L ...
hold返回指定timing path endpoint 上的hold time is_clock_gating_hold返回指定timing path是否是clock gating的hold check is_clock_gating_setup返回指定timing path是否是clock gating的setup check is_transparent_latch返回指定timing path是否是transparent latch path ...
<div p-id="p-0001">A system and method for providing efficient clock gating capability for functional units are described. A functional unit uses a clock gating circuit for power management. A setup t
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