Impact of Sequential Clock Gating on Power Estimating the power saving potential of a combinational clock gating expression is relatively easy. The change in power of a clock-gated register is computed after reducing the switching activity of the clock net driving the register. The signal that disa...
Sequentiality and Prefetching in Database Systems Analysis of the generalized clock buffer replacement scheme for database transaction processing 给每页一个counter,当hit的时候增加它的值,当指针扫过的时候减这个值,减到0就可以替换掉了。好处是可以保留更多的历史访问信息,更精准地把很少访问的页找出来。 Two...
This result is accomplished by providing a multi- state sequential apparatus having more states than clock phases. The apparatus will detect a stop condition on the last clock phase of a clock sequence and instead of changing to the state associated with the first clock phase of the next clock...
ICG的setup和hold时间都已经在库中进行了建模,并且其CK引脚默认为implicit non-stop pin。 以上内容只是简单的示例,实际上,根据sequential cell的类型、控制寄存器触发边沿和测试控制信号的位置,库中可以提供多种不同的ICG单元。 (3)什么情况下会做clock gating check(tool infer) 可以通过经过cell的信号和经过的cell...
set_clock_gating_style -sequential_cell latch B:不使用锁存器的门控单元,可以通过下面的命令来设置: set_clock_gating_style -sequential_cell none C:使用集成的门控单元则不需要使用这个-sequential_cell来设置了,因为-sequential_cell 选项设置是否采用基于锁存器的风格。使用集成的门控单元直接设置参数就可以...
Figure 3.38(a) illustrates a generic path in a synchronous sequential circuit whose clock period we wish to calculate. On the rising edge of the clock, register R1 produces output (or outputs) Q1. These signals enter a block of combinational logic, producing D2, the input (or inputs) to...
Clock Network Simulation Commands Overview of Clock Mesh Analysis To use clock mesh analysis, specify the root node of the clock network you want to analyze. Beginning at this node, PrimeTime SI traces the entire clock network, including the clock mesh and sequential device loads. Next, PrimeTime...
This paper presents an algorithm to handle CDC violations as part of the objective function for sequential clock gating optimizations.
当一个pin既有sequential arc又有combinational arc时,library compiler会产生一个内部的checkpin,用于区分这两种arc。以下图为例,U5的lib中会有一个interal的checkpin。默认情况下,工具长Tree时会把U5/CK,U5/checkpin和U52/U53的CK都当成sink来做balance,从而导致比较大的clock skew。
However, we are disciplining ourselves to synchronous sequential design, so the clock period is constant and must be long enough to accommodate the slowest instruction. Example 7.4 Single-cycle Processor Performance Ben Bitdiddle is contemplating building the single-cycle processor in a 7-nm CMOS ...