gokul/cm4-media-carrier

validation/RELEASE_CHECKS.md

# Digital release checks — 2026-10-28

This release is prepared for first-prototype PCB fabrication using the accompanying specification. It is not a tested or certified product. Fabricator DFM/controlled-impedance acceptance and physical first-article bring-up remain required manufacturing steps.

| Check | Result |
|---|---|
| TypeScript | Pass |
| Current tscircuit CLI 0.0.3033 / Core0.0.2225 / autorouter0.0.1012 | Build passed, no circuit errors |
| Native KiCad10.0.5 DRC | 0 violations, 0 unconnected items |
| Native pad geometry/pins/named nets | 285 checked, 0 mismatches |
| Gerber copper pads | 285 match source |
| Gerber routed segments | 1,880 match source coordinates, layers and widths |
| Inner-plane dark/clear regions | Zero symmetric difference from source geometry |
| High-speed reference | No routed high-speed copper outside L2 ground reference |
| HDMI/USB pairs | All5 top-only, no vias, zero PCB centreline length skew |
| Pair edge gap | 0.1501mm in each straight coupled section |
| Uncoupled fanout | HDMI1.966642mm; USB1.364190mm per conductor, below2mm |
| Stencil | 269 top apertures, 0 bottom; CM4 sockets1:1 pad size |
| Drills | 67 plated features (51vias +16component holes/slots), 6NPTH |
| Outline | Closed70×76mm |
| Assembly model | Same PCB primitives as carrier; CM4 mounted over sockets |
| BOM/placement | All19 carrier components with MPN and physical pin1 |
| Visual inspection | Schematic, PCB, assembly, carrier/module3D, copper planes and stencil reviewed |

The geometry audit checks exported geometry and actual files, not electrical signal-integrity simulation. The 100Ω/90Ω targets depend on the specified stackup and fabricator process. No measured impedance, assembled-board operation, thermal endurance or radio performance is claimed.

Informational CLI warnings about unnamed implicit connection traces and absent schematic-sheet border are not connectivity errors. Supplier feeder rotations cannot be certified from the available part metadata, so PLACEMENT.csv includes physical pin1 coordinates and explicit mapping instructions. These are not hidden by changing the checker.