How to ensure clock tree quality?

Q: "How to ensure clock tree quality?"

"o Meeting Skew Targets: Verify achieved skew (global and local/group) against specified targets using CTS reports (report_clock_timing).\nMeeting Latency Targets: Check min/max insertion delays against requirements.\nMeeting DRCs: Ensure no max_transition, max_capacitance, or max_fanout violations\nDuty Cycle Preservation: Check for duty cycle distortion. Ensure minimum pulse width requirements are met.\nBalanced Structure: Visually inspect the tree or use tool reports to check for reasonably …"

o Meeting Skew Targets: Verify achieved skew (global and local/group) against specified targets using CTS reports (report_clock_timing).

Meeting Latency Targets: Check min/max insertion delays against requirements.

Meeting DRCs: Ensure no max_transition, max_capacitance, or max_fanout violations

Duty Cycle Preservation: Check for duty cycle distortion. Ensure minimum pulse width requirements are met.

Balanced Structure: Visually inspect the tree or use tool reports to check for reasonably balanced branches. Global skew gives idea on how overall CTS is balanced.

Use appropriate clock buffers (balanced, low variation).
Apply NDRs (Non-Default Rules like shielding, double spacing) during clock routing to minimize crosstalk susceptibility.

Power Efficiency: Check the number and size of inserted clock buffers/inverters. Ensure the tool performed power optimization if enabled.

Routability: Analyze post-CTS congestion maps.

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