Disclaimer: Please do not submit any confidential information to the Project Community. All presentation materials, proposals, meeting minutes and/or supporting documents are published by OCP and are open to the public in accordance to OCP’s Bylaws and IP Policy. This can be found on the OCP OCP Policies page. If you have any questions please contact OCP.
DC-MHS R1 v1.0 specs have been approved by the OCP Incubation Committee in November 2022.
DC-MHS workstreams are still working the MHS R1 v1.x specifications.
A link to a Readme file explaining how to use the following tables (Latest DC-MHS Specifications, Errata and Supporting Documentation, and Inactive Documents) is here: Link
Specifications
Latest DC-MHS Specifications
Note: The Final Spec Agreement (FSA) for the latest specs has not yet been signed. You may access the released versions in the Contribution Database (Contribution Database).
| Type | Description | Version | Submit Date | Contributor | Link | Notes |
|---|---|---|---|---|---|---|
| Specification | M-CRPS Base Specification | 1.06 | 4/24/26 | Jon Lewis | Link (Base Spec) Link (Drawings) | Updates: • MAJOR Release |
| Specification | M-PnP v0.5 Release Package (.zip file – no preview) | v0.50 | 09/26/25 | Phillip Leech | Link (v0.5 Release Package) | This contains three (3) specifications files, twenty-three (23) supplementary files, and a Readme.docx file with descriptions of each file. • OCP_M-PnP_FRU_Discovery_Boot_Spec_v0.5.0_RC2.pdf • OCP_HPM_FPGA_Spec_v0.5.0_RC2.pdf • OCP_M-PNP_INTEROP_Design_Spec_v0.3.0.pdf • JSON Schema Files: hardware-component-v0_5_6.json, fpga-v0_1_3.json, and PDF versions • HPM JSON Mock-up Files: hpm-fru-mockup-type1-hpm-example-v0.6.8.json and PDF version • Peripheral JSON Mock-up Files: a) Riser Mockups: peripherals-fru-riser-1-x8-slot-example-v0.3.4.json, peripherals-fru-riser-1-x16-slot-example-v0.3.1.json, peripherals-fru-riser-2-x8-slot-example-v0.3.1.json, peripherals-fru-riser-2-x16-slot-example-v0.3.1.json, and PDF versions. b) UBM Backplane Mockup: peripherals-fru-ubm-example-v0.3.5.json.pdf and PDF version. c) PDB Mockup: peripherals-fru-pdb-type2-example-v0.1.5.json and PDF version • Visio Drawings to support JSON mock-ups: HPM Type 1 Example v7.vsdx, Riser Examples v2.vsdx, Backplane Examples v5.vsdx, PDB EEPROM FRU Examples v5.vsdx • IP Block Examples List: IP Block Examples List_v1.xlsx |
| Specification | M-SDNO Base Specification | 1.1 RC2 | 5/30/25 | Mike Gregoire | Link (no change bar) Link (CB Version) | Updates: • MAJOR Release • Added support for 48V power ingress and egress • Added support for CFF DC-SCM as an alternative to the HFF DC-SCM • Added a new HPM Class “E” which enables direct plug of M-CRPS power supplies into an M-SDNO HPM |
| Specification | M-PIC Base Specification | 1.11 | 03/25/25 | Clifford DuBay | Link (no change bar) Link (CB Version) | Updates: • Updated Table 7 and Table 16 names to match the connector configuration. • Updated Dedicated 48V Supply connector naming for consistency. |
| Specification | M-FLW Base Specification | 1.2 RC3 | 10/10/24 | Corey Hartman | Link (no change bar) Link (CB Version) | Updates: • Added info for DSFF NIC, removed LFF NIC • Loosened requirements for PIC.PWR |
| Specification | M-DNO Base Specification | 1.1 RC2 | 3/21/2024 | Mike Gregoire | Link (non CB Version) Link (CB version) | Updates: • Completed M-DNO Type 3 length to be consistent with M-SDNO.A555 • Updated M-DNO to be consistent with M-SDNO |
| Specification | M-PESTI Base Specification | 1.2 RC2 | 3/14/24 | Jeff Kennedy | Link (no change bar) Link (CB Version) | Several small updates including: • Modifying the presence pulldown range. • Amending payload format. |
| Specification | M-XIO Base Specification | 1.04 RC1 | 2/28/24 | Charlie Ziegler | Link (non CB Version) Link (CB version) | Updates: • Update compliance link. • Fix typos. |
| Specification | M-SIF Base Specification | 0.5 | 10/2/2023 | Greg Sellman | 0.5 Link (non CB Version) 0.5 Link (CB version) | Updates to high-speed IO & management interfaces. Connectors defined. |
Latest DC-MHS MCAD
| Spec. Impacted | Name | Format | Version | Submit Date | Contributor | Link | Notes |
|---|---|---|---|---|---|---|---|
| SDNO | M-SDNO Class “A” Zip CAD Files | STP | CAD | 6/13/24 | Brian Aspnes | Link | Includes A305, A335, and A555. |
| SDNO | M-SDNO Class “B” Zip CAD Files | STP | CAD | 6/13/24 | Brian Aspnes | Link | Includes B305, B335, and B555. |
| SDNO | M-SDNO Class “C” Zip CAD Files | STP | CAD | 6/13/24 | Andy Junkins | Link | Includes C305, C335, and C555. |
| SDNO | M-SDNO Class “D” Zip CAD Files | STP | CAD | 6/13/24 | Andy Junkins | Link | Includes D305, D335, and D555. |
| SDNO | M-SDNO Class “E” Zip CAD Files | STP | CAD | 5/16/25 | Ronald Tsai | Link | Includes E335. |
| DNO | M-DNO Type 3 MCAD | STP | CAD | 3/21/24 | Brian Aspnes | Link | Type 3 CAD File |
| FLW | T1 FLW | STP | CAD | 5/23/2023 | Brian Aspnes | Link | |
| DNO | DNO Type 4 MCAD | STP | CAD | 2/15/23 | Mike Gregoire | DNO Type 4 Link | Type 4 CAD |
| DNO | DNO Type 2 MCAD | STP | CAD | 10/26/22 | Mike Gregoire | Link | Type 2 CAD Files |
Latest Design Specs
| Spec. Impacted | Name | Format | Version | Submit Date | Contributor | Link | Notes |
|---|---|---|---|---|---|---|---|
| M-PIC | 48V PICPWR and Dedicated Supply Product Specification | Design Spec | 9/9/25 | Hal Loket | Link | PDF File | |
| M-CRPS | M-CRPS Design Specifications October 2024 Release Package | Design Specs | Zip | 10/01/24 | Aurelio Rodriguez Echevarria | Link | Zip File |
| M-HPM | DC-MHS Common Chassis Design for Differing HPM Thickness and CRPS Connector Offsets | Design Spec | 4/17/24 | Patrick Hampton | Link | PDF File |
Supporting Documentation
This section includes supporting information.
| Spec. Impacted | Name | Format | Version | Submit Date | Contributor | Link | Notes |
|---|---|---|---|---|---|---|---|
| PIC | Current Connector List | Document | 1 | 2/1/2023 | Cliff DuBay | Link | M-PIC Connector List |
| PnP | FRU Packaging Tool | Tool | 1 | 11/19/2025 | Phillip Leech | Link | Get Hub Link |
Inactive Documents
This section includes outdated documents.
| Spec Impacted | Name | Format | Version | Submit Date | Contributor | Link | Notes |
|---|---|---|---|---|---|---|---|
| Specification | M-CRPS Base Specification | 1.05 RC5 | 10/01/24 | Aurelio Rodriguez Echevarria | Spec Link Mech Drawing Link | Update: • Numerous Changes See Change Log. | |
| Specification | M-PnP v0.3 Release Package (.zip file – no preview) | .zip file | v0.30 | 10/10/24 | Phillip Leech | Link (v0.3 Release Package) | This contains five files including a Readme.txt file. • OCP_M-PNP_INTEROP_Design_Spec_v0.3.0.pdf • OCP_M-PnP_FRU_Discovery_Boot_Spec_v0.3.0.pdf • OCP_HPM_FPGA_Spec_v0.3.0.pdf • hpm-fru-mockup v0.5.2.json |
| Specification | M-SDNO Base Specification | 1.0 RC2 | 6/13/24 | Mike Gregoire | Link (no change bar) Link (CB Version) | Updates: • Added second control panel location option for Class C • Various figure cleanup and text clarification for release | |
| Specification | M-PIC Base Specification | 1.1 | 12/16/24 | Clifford DuBay | Link (no change bar) Link (CB Version) | Updates: • MAJOR RELEASE • Merged the M-PIC Base Specification 48V Addendum v0.9 content to add 48V support to M-PIC Base Spec • Clarified 12V PICPWR connectivity. • Changed SMBus pull-ups from 100kΩ to RPU. • Clarified SGPIO waveform bit ordering. • Added HPM and peripheral requirements for configurations with more than one 12V_PRIMARY domain. | |
| Specification | M-PIC Base Specification 48V Addendum | 0.7 | 10/15/2024 | Cliff DuBay | 0.7 Link (non CB Version) 0.7 Link (CB version) | Updates: • Updated dedicated 48V supply input sources from “ORV3 rack” to “48V rack busbar”. • Updated 48V_SUPPLY and 48V_PRIMARY requirements like what was done for 12V_PRIMARY in M-PIC v1.06. • Updated the PDB introduction in section 10.2.14 to account for two connector types. • Added a link to “Open_Rack/SpecsAndDesigns” in section 13. • Added images for all 48V connectors. • Added excursion support requirements for 48V connectors. • Added provisions for more than one dedicated 48V supply connector throughout. • Added missing requirements for a 48V Architectures. | |
| Specification | M-PIC Base Specification | 1.06 | 10/15/2024 | Cliff DuBay | 1.06 Link (non CB Version) 1.06 Link (CB version) | Updates: • Reordered 12V_PRIMARY Requirements. • Clarified SMBus pull-up location. • Added FLEXIO electrical requirements. • Clarified FLEXIO bias and destination requirements. • Corrected the outline flow for Cabled Boot Peripheral. | |
| Specification | M-PIC Base Specification 48V Addendum | 0.6 | 6/6/2024 | Cliff DuBay | 0.6 Link (non CB Version) 0.6 Link (CB version) | Updates: • Added updates from M-PIC v1.05. • Updated PDB Management naming. • Added 48V requirements to the Compliance Checklist. • Updated from ORv3 to 48V Rack throughout. • Added a requirement for 48V peripherals that also use 12V in section 10.2.11. • Removed the requirement for 12V PICPWR connectors to be used for egress only on 48V HPMs and PDBs. • Added a contributor. | |
| Specification | M-PIC Base Specification | 1.05 | 5/17/2024 | Cliff DuBay | 1.05 Link (non CB Version) 1.05 Link (CB version) | Updates: • Clarified SB signals to be unique per channel instead of per connector. • Simplified peripheral input requirements in section 9.1.6. | |
| Specification | M-FLW Base Specification | 1.1 RC2 | 4/5/2024 | Brian Aspnes | Link (non CB Version) Link (CB version) | Updates: • Updated M-FLW to be consistent with M-SDNO and M-DNO | |
| M-CRPS | M-CRPS Base Specification | 1.04 RC3 | 2/22/24 | Aurelio Rodriguez Echevarria | RC3 Link Mech Dwg | Update: • Updated typo in a dimension in the following mechanical drawings. | |
| SDNO | M-SDNO Base Specification | 0.9 RC2 | 4/18/24 | Mike Gregoire | Link (no change bar) Link (CB Version) | Updates: • Added option to support 2nd DC-DCM and DSFF NIC for Class C/D HPMs | |
| SDNO | M-SDNO Class “C” Zip CAD Files | STP | CAD | 4/18/24 | Andy Junkins | Link | Includes C305, C335, and C555. |
| SDNO | M-SDNO Class “D” Zip CAD Files | STP | CAD | 4/18/24 | Andy Junkins | Link | Includes D305, D335, and D555. |
| SDNO | M-SDNO Class “A” Zip CAD Files | STP | CAD | 1/22/24 | Brian Aspnes | Link | Includes A305, A335, and A555. |
| SDNO | M-SDNO Class “B” Zip CAD Files | STP | CAD | 1/22/24 | Brian Aspnes | Link | Includes B305, B335, and B555. |
| CRPS | M-CRPS Design Specifications | Zip (inc PDF) | 1 | 4/17/2024 | Aurelio Rodriguez Echevarria | Link | CRPS Design Specifications. |
| PIC | M-PIC Base Specification 48V Addendum | 0.3 | 3/1/24 | Cliff DuBay | 0.3 Link (non CB Version) 0.3 Link (CB version) | Update: • Early directional version (0.3) of the M-PIC Base Specification 48V Addendum. • The 48V content is being developed in a separate document with the intent to integrate it into the main M-PIC specification once the content is ready. | |
| PIC | M-PIC Base Specification | 1.04 | 3/1/24 | Cliff DuBay | 1.04 Link (non CB Version) 1.04 Link (CB version) | Update: • Addressed V1.03 Errata.- Updated FULL_PWR_CYCLE_N/FLEXIO to avoid power-up failures. • Updated PICPWR labeling requirements. • Updated DC-SCM revisions supported. • Simplified/clarified +12VStby “OR-ing”, cable construction expectations, control panel SPI, and DC-SCM. | |
| SDNO/FLW/DNO | M-HPM 1033 Errata Document | 1 | 2/21/2024 | Mike Gregoire | Link | Corrected datum references when dimensioning 1033 riser locations which do not align with the released SFF-TA-1033 V1.0. | |
| PIC | M_PIC_R1_V1.03_Errata | 1.03 | 2/1/2024 | Cliff DuBay | Link | Errata # 1: Update the description and requirements for the FULL_PWR_CYCLE_N/FLEXIO pin to avoid power-up failures. | |
| SDNO | M-SDNO Base Specification | 0.7 RC3 | 1/29/24 | Brian Aspnes | 0.7 RC3 Link | Update: • Major Changes including Class C Definition and Class C/D Primary SCM/NIC moved for common chassis. | |
| SDNO | M-SDNO Class “C” Zip CAD Files | STP | 0.7 | 1/22/24 | Brian Aspnes | Link | Includes C305, C335, and C555. |
| SDNO | M-SDNO Class “D” Zip CAD Files | STP | 0.7 | 1/22/24 | Brian Aspnes | Link | Includes D305, D335, and D555. |
| CRPS | M-CRPS Base Specification | 1.03 RC2 | 12/15/23 | Aurelio Rodriguez Echevarria | 1.03 RC2 Link Mech Dwg | Update: • Multiple updates to many sections • Updated pictures and figures • Fixed typos | |
| XIO | M-XIO Base Specification | 1.03 | 11/21/23 | Javier Lasa | 1.03 Link (non CB Version) 1.03 Link (CB version) | Update: • Version 1.03 of the specification with and without change bar. • Changed pull-up from 127Kohm to 100Kohm on FLEXIO / CBL_PRES_PESTI_N topologies. | |
| SNDO | M-SDNO Base Specification | 0.5 | 10/2/2023 | Brian Aspnes | 0.5 Link | Replaces the (Directional) M-DNO Specification Updates for HPM Types 5-7 0p3 RC2.pdf specification. | |
| SDNO | M-SDNO Class “A” Zip CAD Files | STP | 0.5 | 10/2/23 | Brian Aspnes | Link | Includes A305, A335, and A555. |
| SDNO | M-SDNO Class “B” Zip CAD Files | STP | 0.5 | 10/2/23 | Brian Aspnes | Link | Includes B305, B335, and B555. |
| SDNO | M-SDNO Class “D” Zip CAD Files | STP | 0.5 | 10/2/23 | Brian Aspnes | Link | Includes D305, D335, and D555. |
| PIC | M-PIC Base Specification | 1.03 | 9/28/2023 | Cliff DuBay | 1.03 Link (non CB Version) 1.03 Link (CB version) | Update: • SGPIO and PDB Management RFU • Cable Optimized boot connector rating & power control • I3C recommendations • SB – signal termination | |
| CRPS | M-CRPS Base Specification | 1.02 RC2 | 8/23/2023 | Aurelio Rodriguez Echevarria | 1.02 RC2 Link 1.02 RC2 Mechanical Drawings | Update: • Multiple updates to many sections • Updated pictures and figures | |
| CRPS | M-CRPS Base Specification | 1.01 RC2 | 7/26/2023 | Aurelio Rodriguez Echevarria | 1.01 RC2 Link 1.01 RC2 Mechanical Drawings | Update: • Integrated Errata • Updated pictures and figures | |
| M-DNO | M-DNO Base Specification | 1.01 RC2 | 7/20/23 | Mike Gregoire | 1.01 RC2 Link (non CB Version) 1.01 RC2 Link (CB version) | Updates: • Updated tables, link1.01 RC2 Link (non CB Versions, pictures) | |
| PESTI | M-PESTI Base Specification | 1.1 RC5 | 7/18/2023 | Jeff Kennedy | 1.1 RC5 Link (no change bar) 1.1 RC5 Link (CB Version) | Update: • BAUD accuracy tolerance changed to +/-2%. • Overall clarification on the spec, general clean up. • Simplified payload headers and source to destination discovery examples. • See specification for detailed updates. | |
| (Directional) M-DNO Types 5-7 0p3 RC2 | Updated CAD Files for Type 7 | STP | 1.0 | 6/1/23 | Andrew Junkins | Link | Type 7 CAD Files – updated to match M-DNO v0.3 RC2 specification |
| FLW | M-FLW Base Specification | v1.01 RC2 | 6/1/2023 | Brian Aspnes | 1.01 RC2 Link 1.01 RC2 Link (CB Version) | • Fixes for date mismatches and Figure numbers. • Change bar version | |
| (Directional) M-DNO Types 5-7 0p3 RC2 | Updated CAD Files for Type 6 | STP | 1.0 | 5/16/23 | Brian Aspnes | Link | Type 6 CAD Files |
| (Directional) M-DNO Types 5-7 0p3 RC2 | Updated CAD Files for Type 5 | STP | 1.0 | 5/16/23 | Brian Aspnes | Link | Type 5 CAD Files |
| (Directional) M-DNO Specification Updates for HPM Types 5-7 0p3 RC2 | M-DNO Base Specification | v0.3 RC2 | 5/16/23 | Mike Gregoire | 0.3 Link | (Directional) M-DNO Specification Updates for HPM Types 5-7 | |
| SIF | M-SIF Base Specification | 0.3 | 3/29/2023 | Dirk Blevins | Link | Early version (0.3) of the M-SIF specification | |
| XIO | M-XIO Base Specification | 1.02 | 3/16/2023 | Javier Lasa | Version 1.02 Link | Update: • Version 1.02 of the Specification with the Change Bar. • Added a compliance table. | |
| PIC | M-PIC Base Specification | 1.02 | 3/13/2023 | Clifford DuBay | Version 1.02 Link | Update: • Version 1.02 of the Specification with the Change Bar. • Improved compliance requirement visibility, clarified OR-ing requirement for +12V sources, & added contributors. | |
| CRPS | Errata | RC4 Rev 2 | 4/25/23 | Aurelio Rodriguez Echevarria | Link | Corrections in Rev 1.0 RC4 of the M-CRPS specification. | |
| CRPS | Errata | RC4 Rev 1 | 4/3/2023 | Aurelio Rodriguez Echevarria | Link | Fixes typos and drawing errors. | |
| PIC | M-PIC Base Specification | 1.01 | 2/3/2023 | Clifford DuBay | Version 1.01 Change Bar | • Version 1.01 of the Specification with the Change Bar. • Update Figures and Tables, add Errata content, include Hot Plug information. | |
| PIC | M-PIC Errata 1 and 2 | 1.0 | 2/1/2023 | Clifford DuBay | Link | • Errata 1: Update Section 9.1 to Avoid High Current in Partial-Mate Conditions • Errata 2: Update Section 9.1.7.6 to increase the Power Rating from 1080W to 2000W. | |
| XIO | M-XIO Base Specification | 1.01 RC1 | 1/24/2023 | Javier Lasa | Link | Incorporated Errata #1. ECN: Addition of cable construction considerations, incorporated cable considerations (alignment with PCI-SIG internal cable spec), clarification on P3V3_MGMT usage. | |
| XIO | Errata | 1.0 | 12/12/2022 | Javier Lasa | Link | Update SFF-TA-1016 and SFF-TA-1033 pinouts. | |
| DNO | M-DNO Type 3 CAD Files | STP | 1 | 10/26/22 | Mike Gregoire | Link | Type 3 CAD Files |
| XIO | M-XIO Specification | 1.0 RC4 | 9/28/2022 | Javier Lasa | Link | Reviewed in Oct meeting. Approved by the IC on 11/4/2022 | |
| PESTI | M-PESTI Specification | 1.0 RC2 | 9/28/2022 | Javier Lasa | Link | Reviewed in Oct meeting. Approved by the IC on 11/4/2022 | |
| DNO | M-DNO | 1.0 RC5 | 9/28/22 | Michael Gregoire | Link | Reviewed in Oct meeting. Approved by the IC on 11/4/2022 | |
| FLW | M-FLW Specification | 1.0 RC5 | 9/28/2022 | Corey Hartman | Link | Reviewed in Oct meeting. Approved by the IC on 11/4/2022 | |
| CRPS | M-CRPS Specification | 1.0 RC4 | 9/28/22 | Aurelio Rodriguez Echevarria | Link | Reviewed in Oct meeting. Approved by the IC on 11/4/2022 | |
| PIC | M-PIC Specification | 1.0 RC7 | 9/28/2022 | Clifford DuBay | Link | Reviewed in Oct meeting. Approved by the IC on 11/4/2022 |