Mechanical Design

Peripheral Connector Placement

Peripheral designers should consider the impact of connector placement location. Carriers may have side-by-side port spacing as small as 2 mm (to support double-wide peripherals). Right-angle or edge-launch connectors placed along the sides of the peripheral could lead to interference with adjacently-mounted peripherals on the carrier. The best location for such connectors is along the board edge opposite the Samtec board-to-board connector. The use of vertical-launch connectors is also encouraged where feasible.

Peripheral Mechanical Support

Peripherals that are large in size or require substantial cabling may benefit from additional mechanical support. This support would be in addition to the board-to-board mounting hardware as described in the SYZYGY specification. Design of such support is beyond the scope of this guide, but may include, for example, a 3D-printed support bracket.

Peripheral Mounting Hardware

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Cable Mounting Hardware

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Status Indicators and PCB Labels

Carrier designers should consider including the following items for usability:

  • An LED indicator for each VIO rail to indicate when the rail is active
  • Silkscreen indicators for each port:
    • Port identifier (letter, number, reference designator, etc)
    • Port type (standard, TXR2, TXR4)
    • VIO group
    • Compatible voltage range

An example layout for port silkscreen is shown below.