08/16/23 DC-MHS Public Meeting

DC-MHS Project Leads

These meetings are recorded via audio and video. By participating you consent that these recordings may be made publicly available. Any presentation materials, proposals and meeting minutes are published on the respective project's wiki page and are open to the public in accordance with OCP's Bylaws and IP Policy. This can be found at http://opencompute.org/about/ocp-policies/.

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DC-MHS + OCP

DC-MHS Website:

https://www.opencompute.org/projects/dc-mhs

DC-MHS WIKI:

https://www.opencompute.org/wiki/Server/DC-MHS

Training Note

Bottom of WIKI has several useful training videos and presentations that are highly recommended.

Public Email List Subscription

https://ocp-all.groups.io/g/OCP-DC-MHS

Public Meetings

Monthly meetings reoccur 3^rd WED 8am PT monthly. Meeting logistics provided on DC-MHS Home Page Call Calendar. Meeting recordings posted to WIKI.

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*Don’t Overlook

These meetings are recorded via audio and video. By participating you consent that these recordings may be made publicly available. Any presentation materials, proposals and meeting minutes are published on the respective project's wiki page and are open to the public in accordance with OCP's Bylaws and IP Policy. This can be found at http://opencompute.org/about/ocp-policies/.

Connect. Collaborate. Accelerate.

08/16/23 Public Meeting

• DC-MHS Spec Updates (Brian A.)
• M-CRPS Workstream Update (Aurelio R.)
• M-HPM Workstream Update (Mike G.)
• M-SIF Workstream Update (Greg S.)

These meetings are recorded via audio and video. By participating you consent that these recordings may be made publicly available. Any presentation materials, proposals and meeting minutes are published on the respective project's wiki page and are open to the public in accordance with OCP's Bylaws and IP Policy. This can be found at http://opencompute.org/about/ocp-policies/.

Connect. Collaborate. Accelerate.

Activities and Timeline

NEW

M-CRPS Workstream Update

• M-CRPS Base Specification v1.01 has been released on July 26th 2023.
• M-CRPS Base Specification v1.01 RC2 PDF with bookmarks.
• New set of Mechanical drawings.
• New Set of 3D STP models.
• Released a tool to translate .ini files to .bin for the configuration area of the configuration file.
• Working in the v1.02 tentative release for early September.
• Working on the Design Specifications.

These meetings are recorded via audio and video. By participating you consent that these recordings may be made publicly available. Any presentation materials, proposals and meeting minutes are published on the respective project's wiki page and are open to the public in accordance with OCP's Bylaws and IP Policy. This can be found at http://opencompute.org/about/ocp-policies/.

Connect. Collaborate. Accelerate.

M-HPM Workstream Update

• V0.5 Documentation Plan
• V0.5 Draft of new HPM Types is in progress
• Targeting release prior to next public call (early September)
• Plan to include only new types 5+
• For latest information on
• DNO Type 2-4, refer to “M-DNO V1.01” (Released 7/23)
• DNO Type 5+, refer to “M-DNO T5+ V0.5” (once released)
• Final “1.0” documentation approach (1 or 2 specifications) TBD
• Key Updates
• Type 7 width change from 500mm to 512mm
• Discussing scalable approach to Type Definition that would simplify # of Types, and enable smaller HPMs to be defined / compliant based on larger FF’s.
• Investigating new approaches to secondary side “Zone 2” component keepout zones
• Driven by expanded interoperability scope
• May impact interoperability with existing V1.0 DNO HPMs
• Intent still to enable as much interoperability amongst M-DNO family HPMs as possible

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These meetings are recorded via audio and video. By participating you consent that these recordings may be made publicly available. Any presentation materials, proposals and meeting minutes are published on the respective project's wiki page and are open to the public in accordance with OCP's Bylaws and IP Policy. This can be found at http://opencompute.org/about/ocp-policies/.

Connect. Collaborate. Accelerate.

PERST_N [3:0]

REFCLK_P/N [3:0]

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Core

Element

Sled

Redundant Mgmnt Interface(s)

Power Interface

Data

Slice 0

Interface

Data

Slice n

Interface

Data

Slice

Interface(s)

x16 PCIe/CXL lanes

HPM Far Edge

HPM Near Edge

Redundant

Management Interface

2x PESTI

2x KX_KR_TX_P/N or USB 3.0**

2-WIRE (I2C/I3C)

2x MNGT_CBL_PRSNT_N

Data Slice Bifurcation & Directionality is negotiated over the management interfaces.

2x KX_KR_RX_P/N or USB 3.0**

2x USB_D+/D-

FORCE_THROTTLE_N

..

4x 2-WIRE (I2C/I3C)

CBL_PRSNT_N [3:0]

M-SIF Workstream Update

4x FLEXIO*

8x RFU*

8x FLEXIO*

These meetings are recorded via audio and video. By participating you consent that these recordings may be made publicly available. Any presentation materials, proposals and meeting minutes are published on the respective project's wiki page and are open to the public in accordance with OCP's Bylaws and IP Policy. This can be found at http://opencompute.org/about/ocp-policies/.

* The number of available FLEXIO and/or RFU may vary depending on I/O connector choice.

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** KX/KR or USB 3.0 will need to be negotiated between the host and chassis manager prior to enablement of this link.

• HSIO and Redundant Management Interface signal lists closed (see below)
• Main body of spec will define required and optional signals
• Appendices will provide guidance related to various physical connector systems

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• Shared power and cooling will be discussed at a high level within the spec
• Low level implementation details will be left to the designer(s) as these are areas where innovation and differentiation are still appreciated

• M-SIF Spec v0.5 by end of August

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Backup – Spec Info

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DC-MHS Base Specification Introduction

• Form-Factor Base Specifications details include mechanical outlines, mount-points, placement restrictions, entry/exit point electrical requirements, and connector placements. Each form-factor Base Specification may include multiple, related form-factors with a high degree of consistency between them, maximizing design reuse.
• Read these first, you can choose DNO or FLW if you only have one application

• Ingredient Base Specifications define the interfaces from the HPM to other classes of peripheral and infrastructure within a chassis, including but not limited to connector, pin-out, electrical, signaling, sequencing, and protocol requirements.
• The HPM form-factor Base Specifications draw upon these Ingredient Base Specifications for consistency across all DC-MHS Rev 1.0 HPMs.
• Read M-XIO and M-PIC second
• Read M-CRPS and M-PESTI third, after you comprehend the other four Base Specs

Form-Factor

Ingredient

Partner Specifications

LPTI r2.1

LVDS Tunneling Protocol & Interface

NIC r3

Network Interface Card

PCISIG Internal Cable Spec

Internal Cable Specification for

PCI Express 5.0 and 6.0

• Partner Specifications are used by DC-MHS and must be understood as they are used as core specifications in DC-MHS.
• Read these last , after you comprehend all for the DC-MHS Base Specs

M-XIO

PCIe/CXL Connectivity to Peripherals

M-PIC

Platform Infrastructure Connectivity

M-PESTI

Sideband Signal Virtualization

M-CRPS

AC/DC and DC/DC 12v/48v Supplies

M-FLW

Full Width Host Processor Module

M-DNO

Density Optimized Host Processor Module

DC-SCM r2.1

Secure Control Module

PCISIG Base/CEM Specs

PCI Express 6.0

Open Rack v3

OCP Open Rack

Specification Links

• OCP DC-MHS r1 Specifications (CRPS, DNO, FLW, PESTI, PIC, SIF, XIO)
• https://www.opencompute.org/wiki/Server/DC-MHS
• OCP DC-SCM r2 and LPTI r2 Specifications
• https://www.opencompute.org/wiki/Hardware_Management/Hardware_Management_Module
• v2.1 was released 5/23/23
• OCP NIC r3 Specification
• https://www.opencompute.org/wiki/Server/NIC
• v1.21 was released on 12/22/22
• OCP Open Rack r3 Specification
• https://www.opencompute.org/wiki/Open_Rack/SpecsAndDesigns
• v1.0 was release 9/22/22
• PCISIG Internal Cable, Base and CEM Specifications
• https://pcisig.com/specifications
• Must be a member to see unreleased specifications
• New unreleased v6.x Base Spec w/ new Chapter 12 called “Out of Band Management” (Protocol WG)
• https://members.pcisig.com/wg/PCIe-Protocol/document/19507
• New unreleased v1.0 Internal Cable Specification (Electrical WG)
• https://members.pcisig.com/wg/PCIe-Electrical/document/19757
• New unreleased v6.0 CEM spec with USB2 via JTAG (Mechanical WG)
• https://members.pcisig.com/wg/PCIe-Mechanical/document/19700
• https://members.pcisig.com/wg/PCIe-Mechanical/document/folder/1099

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