What are the checks after CTS?

1.       Clock Tree Reports:

§  Skew Report: Verify that the achieved maximum skew (global and potentially per skew group) meets the target specified in the CTS spec/constraints.

§  Latency Report: Check the minimum and maximum insertion delays. Ensure they are within acceptable ranges or meet specific targets.

§  DRC Report (CTS Specific): Check for violations of max_transition, max_capacitance, max_fanout specifically on the clock tree buffers/inverters and nets.

§  Duty Cycle and MPW violatons.

§  Clock tree power.

§  SI and cross talk.

2.       Timing Analysis (Post-CTS STA):

3.       Placement Legality: Verify that the newly inserted clock tree buffers/inverters are legally placed (checkPlace, checkLegality). Sometimes aggressive placement during CTS can cause overlaps.

4.       Congestion: The addition of clock buffers and the routing of clock nets (even if only estimated by trial route) can significantly increase congestion

5.       Clock Tree Structure Verification: and cts exceptions are proper.

6.       Utilization/Area: Check the increase in cell count and utilization due to the added clock tree cells.

7.       Log Files: Review tool log files for any critical warnings or errors generated during the CTS process.

o    Checks After CTS: https://fr.scribd.com/presentation/637490970/Untitled