The purpose of this design is to enable the AC922 to accept a DC-SCM v1.0 hardware management module. This enables a developement platform for software development.
For connection with a DC-SCM, the DC-SCM v1.0 release design specifies the connector as an SFF-TA-1002 compliant 4C+ connector. The 4C+ connector is a 4C compliant connector with an additional 28-pin “OCP bay” defined in the OCP NIC 3.0 specification. The right-angled variety allows for the DC-SCM to lay within the BMC cage assembly. This can be implemented with TE 2336568-1.
References:
DC-SCM 0.95 Draft Specification: https://www.opencompute.org/documents/ocp-dc-scm-spec-rev-0-95-pdf
DC-SCM 2.0 Draft Specification: https://drive.google.com/file/d/1UkFgAFKh8qz4mAXdvodYsW0fg8XhyVf2/view?usp=sharing
AC922 Specification: see OpenPower website
SFF-TA-1002 Protocol Agnostic Multi-Lane High Speed Connector https://members.snia.org/document/dl/27231
AntMicro Design Specification: https://github.com/antmicro/artix-dc-scm.git