Custom Motherboard Design Inquiry

flux

I can’t execute project changes right now because the session has no remaining execution credits, so I have not added components, schematic wiring, layout, or project files to the Flux project.
Current project state:
  • Components: 0
  • Nets: 0
  • Schematic: empty
  • PCB layout: not started
  • Component list/BOM: not generated
  • Power architecture: not designed yet
What remains to be done for this motherboard:
  1. Define the CPU/platform
    A Linux-capable SBC with DDR3, SATA III, USB, HDMI, Ethernet, Wi-Fi, and GPIO needs a specific processor or SoC. A “modern” x86/ARM CPU with 6 DDR3 DIMM/SO-DIMM slots is a very complex high-speed design and usually requires:
    • CPU/SoC datasheet and reference design
    • DDR3 memory layout rules
    • PCIe/SATA/USB/HDMI controlled-impedance routing
    • Power sequencing requirements
    • BIOS/boot firmware support
  2. Choose a realistic architecture
    Practical options include:
    • ARM SoC/module-based design using a compute module with DDR already integrated
    • x86 COM Express / SMARC / Qseven module carrier board
    • Custom SoC board, much harder and not beginner-friendly
    • Mini-server carrier board using an existing CPU module plus SATA, USB, Ethernet, HDMI, GPIO, and power management
  3. Create schematic blocks
    Required blocks would include:
    • CPU or compute module
    • DDR3 memory subsystem or module connector
    • Power input: ATX/DC input, protection, regulators, sequencing
    • SATA III connector and ESD protection
    • USB hub and USB connectors
    • HDMI output with ESD/level/retimer needs depending on source
    • Ethernet PHY/magnetics/RJ45
    • Wi-Fi module, likely M.2 E-key or soldered module
    • GPIO headers with protection/level compatibility
    • Storage connectors: SATA, M.2, eMMC, or microSD depending on platform
    • Fan header and CPU cooling/mechanical support
    • Expansion connectors
  4. Generate PCB layout
    This would require:
    • Board size and connector edge placement
    • Controlled-impedance stackup
    • DDR3 length matching
    • SATA/USB/HDMI differential pair routing
    • Thermal copper and cooling clearance
    • Power plane strategy
    • EMI/ESD protection placement
  5. Verify before completion
    The design would need ERC/DRC review, datasheet checks, and high-speed layout constraints before it could be considered usable.
Recommended next step: choose the compute architecture. For a buildable student-friendly mini-server motherboard, I recommend designing a carrier board around an existing Linux-capable compute module instead of designing a raw CPU + 6-slot DDR3 motherboard from scratch. A COM Express or SMARC module would be the most realistic path for SATA, USB, HDMI, Ethernet, PCIe expansion, and Linux support.
Use COM Express
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Simpler first revision
DDR3 difficulty
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