Backplane

MP62 Face S storage module SM-1 rev A0: KiCad 9 project

4 × M.2 2280 NVMe behind an ASMedia ASM2824 PCIe Gen3 switch, on the MP62-FACE v0.1 outline. The plan, BOM, cost and RAID analysis are in /workspace/macpro62-storage-board-plan.md. The spec is macpro62-face-module-spec-v0.1.md §11.3 (update 3).

Status: FLOORPLAN, not routed.

• PCB: outline, holes, stackup (JLC06161H-2116, 6 layers), rule areas (both-side bus-bar keep-outs, core tab, J_PCIE plug zone), and every IC, connector, socket, standoff, inductor and bulk capacitor placed. Only the lug nets are on the PCB.
• kicad-cli pcb drc: 0 violations, 0 unconnected, 0 footprint errors.
• Schematic (macpro62-storage-face.kicad_sch, one flat A0 sheet, label connectivity, 154 symbols): kicad-cli sch erc: 0 errors, 0 warnings.

Frame

• Same as the template. Module frame origin at the outline's bottom-left, viewed from the core side. Spec (X, Y) → KiCad (60 + X, 190 − Y).
• F = core side (ASM2824 on the die pad, switch support parts ≤ 2 mm).
• B = outer side (J_PCIE, J_AUX, 4 × M.2, power band).

PLACEHOLDERS (replace before routing)

Symbols with logical pin numbering: ASM2824, TPS259824, TPS56C215, TLV62585. Real pinouts: M.2 M-key, MCIO 124 (from the spec CSV), GH15, BL24C64A, TMP1075, 74LVC2G07, SPI NOR, LM74700.

Layers

• User.1: core contact zones.
• User.2: outer height-zone lines.
• User.3: connector band.
• User.4: M.2 card outlines (host parts under a card ≤ 1.6 mm).
• Dwgs.User: stock X-bracket (not fitted, deviation D-S1 / spec C-19).
• Cmts.User: notes.

Rebuild

python3 tools/make_footprints.py        # template footprints (MP62_Face.pretty)
python3 tools/make_storage_fps.py       # MP62_Storage.pretty
python3 tools/build_storage.py          # PCB floorplan (KiCad 9 pcbnew python)
python3 tools/postprocess.py            # stackup + netclasses (PCIE_85R, REFCLK_85R, PWR_12V, PWR_3V3)
python3 tools/build_sch.py              # MP62_Storage.kicad_sym + schematic
kicad-cli pcb drc --severity-all -o drc_report.txt macpro62-storage-face.kicad_pcb
kicad-cli sch erc --severity-all -o erc_report.txt macpro62-storage-face.kicad_sch
/workspace/cadenv/bin/python tools/floorplan.py   # floorplan_storage_SM1.png

ICD rev 2 (2026-10-02)

• U13 INA228 (VSSOP-10, FACE_SMB 0x40, ALERT → FACE_SMB_ALERT#) + R520 2 mΩ 2512 between +12V_PROT and +12V_PROT_S (ahead of U2) + C520; B side at (51.5, 143) / (44, 143) / (51.5, 140.5). DRC 0/0, ERC 0, 157 schematic instances. Renders not refreshed.

ICD rev 3 / O-10 (2026-10-04 ≈ 09:10 ET, Aidan approved)

• J1 (J_PCIE, MCIO 124 RA) X 43.5 → 47.0 (+3.5 mm), narrow-plug courtyard (±21.6). Zero-jog landing at BP fp6 s = +5.0. Nearest B courtyard MH080 0.34 mm; M.2 card bottom Y 28.5 vs J1 body top Y 24.57 (3.9 mm). tools/floorplan.py reads J_PCIE X from face_geom.json.
• Nothing routed besides the lug nets, so no re-route. DRC 0/0/0, ERC 0/0 (schematic unchanged). floorplan_storage_SM1.png, render_core_side_F.png, render_outer_side_B.png regenerated (kicad-cli svg + rsvg-convert).

Next steps

1. Get the ASM2824 datasheet and ball map, plus the LOTES drawing.
2. Replace the placeholders.
3. Update the PCB from the schematic and place the ≈ 120 small passives.
4. Route: PCIe Gen3, ≤ 2 vias per lane; 3V3_SSD on the L4 plane plus B-side pours; 12 V pours.
5. Run DRC and get a JLC quote.