Duty Cycle The basic definition of duty cycle is on_time/(on_time+ Off_time). The on time and off time totally depends upon the rise transition and fall transition. Due to transition differences, duty cycle changes and hence the calculation becomes bad. Practically,…
Useful skew is very important concept in CTS. Let’s discuss this through an example. In the above picture, we can see that the first path is having positive 15 ps of skew, second path is having negative 5 ps of…
CTS Spec File CTS spec file contains the below information: 1. Inverters or buffers to be defined which will be used to balance the clock tree. 2. CTS Exceptions (End points of clock tree). 3. Skew group information. 4. Contains…
Clock Tree Synthesis Clock – A signal with constant rise and fall with ideally equal width (50% rise and 50% fall of the signal width) helps to control data propagation through the clock elements like Flip-Flop, Latches etc. The clock…
Power We will discuss more about power analysis in ECO section while working on PDN, for now let’s take basic glimpse of the power analysis and consumption. There are basically 2 types of power consumption in VLSI design: 1. Dynamic…
Understanding the Performance (Timing) Before going to understand the performance (timing), lets understand how timing is getting checked. At placement stage we have the placement of cells information, but we don’t have connection information in between the cells so how…
What is Congestion? If the number of required routing resources are more than the number of available routing tracks, then the area becomes congested. High congestion causes detours and leads to worse results. Congestion makes the design non-routable that means…
What is Placement Optimization? Optimization is the process of iterating through a design such that it meets timing, area and power specifications. The design must satisfy these multiple design objectives. In general, optimization can be broken down into the following…
We know how scan chains are being inserted and how it effects the circuit. Now let’s focus on the main topic that is, how tool optimizes the scan chain. Reordering of the scan chain helps in optimizing the routing resources…
Refine Placement (Legalization) Legalization makes the rough solution from global placement legal (i.e., no placement constraint violation) by moving modules around locally. Looking at the Congestion, Timing and Power the objects are moved within the region to achieve the goal.…