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Please download the standards below:

OpenCAPI 3.0 Transaction Layer Specification (updated*)

OpenCAPI 3.1 Transaction Layer Specification (updated*)

OpenCAPI 4.0 Transaction Layer Specification

OpenCAPI Data Link Layer Specification

**Updates to this DL specification includes a reserved bit change in the DL content to short flit next indication, cleaned up test and numbering for consistency and added a version table.