Clock Tree Synthesis，顾名思义，就是对design的时钟树进行综合。 主要的目的是让每个clock都能够在尽量短的时间内传达到它们驱动的所有 DFF (寄存器)。 对于CTS，我们有三个指标希望能够尽量做到更好： 每个clock到达其所驱动的sink (DFF)的latency都尽量短； 每个clock之内，以及有时序关系的clock之间的 skew 尽量小； 每个clock的 common path 尽量长。 对于大多数P&R工具，CTS的flow可以总结为以下形式： 需要指出的是，上图中可能有些名词你还不太清楚具体含 …

2022年5月19日 · 时钟树z综合（CTS）是沿ASIC设计的时钟路径插入buffers/inverters的过程，以平衡时钟延迟到所有时钟输入。 因此，为了平衡skew并最小化插入延迟 CTS 。 如下图1所示，在 CTS 之前，所有时钟引脚均由单个时钟源驱动。

CTS（clock tree synthesis）: 在CTS阶段通过插入inverter和buffer来生成 时钟树 。 因为clock信号对于基于DFF的ASIC设计非常重要，我们需要在CTS阶段 balance clock skew 以及 最小化insertion delay 来满足设计的时序（timing）和功耗(power)要求。

CTO is achieved by buffer sizing, gate sizing, buffer relocation, level adjustment and HFN synthesis. We try to improve setup slack in pre-placement, in placement and post placement optimization before CTS stages while neglecting hold slack. In post placement optimization after CTS hold slack is improved. As a result of CTS lot of buffers are ...

2024年2月14日 · Clock Tree Synthesis (CTS) is the technique of balancing the clock delay to all clock inputs by inserting buffers/inverters along the clock routes of an ASIC design. As a result, CTS is used to balance the skew and reduce insertion latency.

2020年8月4日 · The concept of Clock Tree Synthesis (CTS) is the automatic insertion of buffers/inverters along the clock paths of the ASIC design in order to balance the clock delay to all clock inputs.

2024年7月8日 · The main steps in the ASIC physical design flow are: Design Netlist (after synthesis) Floorplanning; Partitioning; Placement; Clock-tree Synthesis (CTS) Routing; Physical Verification; Steps： Partitioning. Partitioning is a process of dividing the chip into small blocks. This is done mainly to separate different functional blocks and also to ...

Extract clock tree and build SPICE deck. Analyze the extracted clock tree and tune it manually. ~ Optimization is focused on expanded clock buffer trees. ~ Quality drops when clock structure becomes complex and CTS constraints are not provided. Need CTS constraints and guidance. => buffer chain delay is added to clock tree insertion delay !

2022年7月19日 · 时钟树综合（CTS）是ASIC设计中平衡时钟路径延迟的关键步骤，通过插入buffer/inverter来减少skew并优化延迟。 本文介绍了CTS前后的检查清单，所需输入，输出结果以及其对设计的影响，包括最小化skew、插入延迟和功率耗散。

CTS is the process of connecting the clocks to all clock pin of sequential circuits by using inverters/buffers in order to balance the skew and to minimize the insertion delay. All the clock pins are driven by a single clock source. Clock balancing is important for meeting all the design constraints. Checklist before CTS: