OCP NIC Community Update�January 2024

For Server Project�����Sub-group Project wiki: https://www.opencompute.org/wiki/Server/NIC�

Mailing List: https://ocp-all.groups.io/g/OCP-NIC

Agenda

• OCP NIC specification version 1.3 update
• Double-width SFF (D-SFF) update
• Mechanical STP file in wiki

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OCP NIC 3.0 ver 1.3 publicly released

A list of updates and maintenance

What’s NOT in ver1.3

• PCIe Gen6
• D-SFF

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Thomas

Mechanical Updates

• Initial (nominal tolerance) D-SFF mechanical STP file and outline uploaded to Wiki
• Supports internal lock
• Plastic handle proposed to help overcome internal lock force
• Similar to DC-SCM spec
• Available in “tall” and “standard” heights
• Support for OSFP transceivers
• Removable center rail for converting 2xSFF → D-SFF
• How much should be defined in card spec vs systems spec?

https://www.opencompute.org/wiki/Server/NIC

OCP NIC Specification Updates (yet to release)

• D-SFF detection flow (high level)
• Detect card presence (PRSNTB[3:0]=TBD)
• Discover new OEM record (0xC1), read contents
• Discover secondary connector capabilities
• Discover supported PCIe link modes

Specification Updates

• New FRU OEM Record (0xC1)
• Defines active interfaces on Secondary Connector
• PCIe link subdivision (see images)
• Decouples static SFF/LFF BIF encoding
• Define supported PCIe link modes
• REFCLK/PERST associations
• End-point/root port modes
• PERST signal direction

Example / WIP partial FRU record describing supported PCIe modes

Double-width SFF (D-SFF)

Spans over two 4C+ connectors

Aligned to spaced per M-FLW HPM specification

Regular and Tall options

Up to 160 Watt

Up to x32 PCIe lanes

Flexibility to configure between 2x SFF or 1x D-SFF

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Illustration

Arnon/Harvey

Double Width Small Form Factor

Gather feedback throughout the year

Provide your feedback at:�https://tinyurl.com/feedback2ocpnic