# SA-EDA-CTS-ROUTE-IR-002 - CTS, Routing, and IR-Drop Report Handoff Replay

## Purpose

This v92 browser replay teaches how clock-tree, global/detailed-route, extracted-RC, and power-integrity evidence must be aligned before an isolated report value is reused. It joins selected states from three independently verified, PDK-free SemiAgora fixtures as a cross-report rehearsal.

## Data Contract

- 4096 rows = 4 clock profiles x 4 routing profiles x 4 power profiles x 4 handoff stages x 4 review roles x 4 evidence postures.
- Source values preserve saved teaching metrics from SA-LAY-007, SA-LAY-008, and SA-LAY-009.
- Normalized 0-100 scores are deterministic report-triage proxies, not physical units, calibrated predictions, or signoff limits.
- The Cartesian product is a juxtaposition of independent evidence states, not a coupled OpenROAD/OpenSTA/PDNSim/OpenRCX run.

## Source Fixture Lineage

- SA-LAY-007 clock tree: 11 source rows; matrix SHA-256 `8B92CF174659ED9177A611CA7F7C3C28553D94A748405B511423C2850E1876FC`; contract SHA-256 `0A8C0F131094234164EF5B7786A579F9972741FC47C16D2AE66E6CA1F4EC1F53`.
- SA-LAY-008 global and detailed routing: 11 source rows; matrix SHA-256 `3C27049DB9618111244D5D3B5554874166F643467486507F0B346F2EA9C729DA`; contract SHA-256 `951C2093F4D79683D40B91EEDDBA8CB842C57ED6348069A3C23255B2A726338E`.
- SA-LAY-009 power grid and IR drop: 14 source rows; matrix SHA-256 `462ECFF660390669067E3FEF8FDABFDADF1F3E6CBCC3A0DEDAF3680D84E289F7`; contract SHA-256 `496BC606FCCA64D2D72DFD003762530026269614D918ECFCD79DBC0583167CB1`.

## Decision Gates

- `owned_reports_required`: 1024 rows
- `stage_alignment_review`: 36 rows
- `bounded_report_replacement_case`: 34 rows
- `signoff_boundary_hold`: 1024 rows
- `cross_domain_owner_review`: 38 rows
- `current_density_review`: 192 rows
- `ir_drop_review`: 192 rows
- `global_route_congestion_review`: 384 rows
- `detailed_route_completion_review`: 384 rows
- `extracted_rc_handoff_review`: 256 rows
- `cross_report_consistency_review`: 20 rows
- `hold_timing_review`: 512 rows

## Public Execution Boundary

- No live OpenROAD, OpenLane, OpenSTA, TritonCTS, FastRoute, TritonRoute, PDNSim, OpenRCX, SPICE, PEX, or server-side EDA execution.
- No uploaded design, netlist, constraint, timing, congestion, DRC, route, power, activity, DEF, GDS, LEF, Liberty, SDC, SPEF, or report parsing.
- No PDK, standard-cell library, technology file, extraction rule, foundry rule deck, proprietary report body, or restricted design collateral is copied or redistributed.
- The three source fixtures are independent PDK-free teaching experiments. Their Cartesian juxtaposition is a report-handoff rehearsal, not a coupled implementation run.
- No row is timing closure, detailed-route completion, EM/IR signoff, ECO guidance, tapeout readiness, qualification, foundry acceptance, or product readiness.
- Owned tool versions, design checkpoint, libraries, constraints, extraction, activity/current data, corners, report provenance, and accountable owner review are required for engineering reuse.

## Source Spine

- [OpenROAD clock tree synthesis](https://openroad.readthedocs.io/en/latest/main/src/cts/README.html) - Official documentation for TritonCTS, characterization, sink and macro clustering, buffering, insertion-delay, and report vocabulary.
- [OpenROAD global routing](https://openroad.readthedocs.io/en/latest/main/src/grt/README.html) - Official documentation for FastRoute-based global routing, guides, congestion iterations, overflow, and timing-aware routing vocabulary.
- [OpenROAD detailed routing](https://openroad.readthedocs.io/en/latest/main/src/drt/README.html) - Official documentation for detailed routing, DRC-oriented search and repair, and routed-geometry report vocabulary.
- [OpenROAD power distribution network generation](https://openroad.readthedocs.io/en/latest/main/src/pdn/README.html) - Official documentation for PDN grids, rings, straps, connections, and connectivity checks.
- [OpenROAD IR-drop analysis](https://openroad.readthedocs.io/en/latest/main/src/psm/README.html) - Official documentation for PDNSim static voltage-drop, current-density, source, and connectivity report vocabulary.
- [OpenROAD parasitics extraction](https://openroad.readthedocs.io/en/latest/main/src/rcx/README.html) - Official documentation for OpenRCX extraction and resistance/capacitance handoff vocabulary.
- [OpenSTA engine](https://github.com/The-OpenROAD-Project/OpenSTA) - Official project source for static-timing concepts, propagated clocks, constraints, parasitics, and report interpretation.

## Replacement Evidence Needed

Engineering reuse requires owned CTS and propagated-clock STA reports, routed congestion and detailed-route/DRC reports, extracted parasitics, PDN source and connectivity context, vector or approved activity/current data, static/dynamic IR and current-density reports, aligned corners and tool versions, design checkpoint provenance, change-control context, and accountable timing/routing/power-integrity owner review.