v0.1.1-reference - Presence detection and sideband evidence

Updated SXM2 reference and source evidence

• Thanks to Michael Williams (@mtwilliams) for contributing the Quanta Big Basin and OpenPOWER comparison in PR #2. The README, workbook and source registry link to the supporting documents.
• The pin tables, workbook and Connector A sheets now explain that grounding A/B7 and A/A39 follows reported simple-carrier designs that omit presence detection and whose controller does not depend on it. Designs that check seating need a validated presence loop. The proposed pin renaming is tracked in issue #1.
• The updated evidence covers sideband and reserved contacts and corroborates the NVHS clock polarity. The Quanta control circuit, generic OpenPOWER guidance and reported community implementations are documented separately.
• Pin labels, coordinates and NVLink connections are carried forward. Checks covered all 800 contacts, 192 two-GPU connections and 384 four-GPU connections. Module continuity and carrier bring-up remain open.

Downloads

Use V100-SXM2-Reference-v0.1.1-reference.zip for the full kit. The workbook and six KiCad PDF exports are also available individually, with checksums in SHA256SUMS.txt. Extract the ZIP and keep the whole kicad/ folder together.

This is a reference pre-release for carrier design. The KiCad starters still require the supporting circuitry described in the KiCad guide.

v0.1.0-reference - V100 SXM2 reference kit

First versioned V100 SXM2 reference snapshot

A curated reference kit for people working on their own V100 SXM2 designs, toward the longer-term open-source carrier-board project. Pigeon Labs' contribution is primarily curation and presentation; the original reverse engineering and source designs are credited in the kit.

Downloads

• V100-SXM2-Reference-v0.1.0-reference.zip: the complete reference, including editable KiCad starters, workbook, CSVs, diagrams, all schematic PDFs, source credits and licence texts.
• V100-SXM2-Pinout-and-NVLink.xlsx: standalone dark workbook.
• Mocha PDFs: complete schematic sets for one, two and four modules, matching the Catppuccin screen previews.
• Print PDFs: the same sheets in monochrome on white paper. The sets contain 3, 7 and 13 pages respectively.
• SHA256SUMS.txt: checksums for the eight downloadable reference files.

Extract the ZIP and keep the whole kicad/ directory together. Open the selected .kicad_pro in KiCad 10.0.7 or a compatible newer version. No Python tools or build environment are needed. The download guide includes project paths and shared-library help.

Included

• 800 canonical A/B contacts per module, retaining evidence and source labels.
• Two- and four-GPU NVLink plans with 192 and 384 exact data conductors.
• Editable connector-only KiCad starters, short net labels with a readable key, and the standalone workbook.
• Getting-started instructions, change notes, correction/file-help forms, contribution guidance and a citation file with upstream references.

No pin assignments or NVLink connections changed while preparing this release. Refer to CHANGELOG.md for future mapping changes.

Reference status

This is a reference pre-release, not a hardware-qualified carrier board. Only NVLink data is wired in the multi-module starters. Clock, power, ground, PCIe and control contacts stay labelled and unconnected. Each module needs an external 156.25 MHz differential NVHS clock at B/E20 (+), B/F20 (-); the separate PCIe clock is 100 MHz at A/E7 (+), A/F7 (-). Supporting circuitry is not included.

The footprint image is a native KiCad view. A raw PCB footprint is not included: exact reuse terms, physical A/B identity, viewing direction and symbol-to-pad mapping remain unresolved. The footprint notes record the source investigation and what needs confirming.

Original hardware design contributions use CERN-OHL-W-2.0; original documentation and presentation use CC BY-SA 4.0. Retain source credits, licence texts and third-party notices. Upstream material keeps its own terms.

This is the initial public reference edition, published from a clean snapshot. Earlier private project history is not part of this repository.

Community

Original sources and investigators are credited in docs/sources.md. Thank you to everyone on the Level1Techs forums for help and contributions. Join the project discussion.