SFF-8449 - HD MANAGEMENT INTERFACE v1.1

Development *** THIS IS NOT A FINAL DRAFT *** SFF-8449 Rev 1.1SFF Committee --Common Management Interface1. ScopeThis specification defines a management interface for SFF-8644 external cableassembly implementations. The detailed mechanical design is documented in SFF-8644.The interface memory map and protocol operation are also outside the scope of thisspecification but can be found in SFF-8636. This document provides a detaileddescription of the electrical interface characteristics.This approach facilitates a common memory map and management interface forapplications with different mechanical, physical layer and otherwise differentimplementations. For example, SFF-8449 defines a four channel solution whichdocuments the management interface physical layer, references SFF-8636 to ensurecompatibility with the common memory map and protocol. See figure 1.Figure 1 Hierarchy of Interface Specifications (Example)Note that SFF-8636 memory map is shared amongst multiple standards. SFF-8636 mayinclude signals beyond the scope of the SFF-8449 interface.1.1 Description of ClausesClause 1 contains the scope and purposeClause 2 identifies referenced and related standards and SFF specificationsClause 3 lists the definitions and conventionsClause 4 provides a general descriptionClause 5 describes the two-wire interfaceClause 6 details the common memory map for managed external interfaces2. ReferencesThe SFF Committee activities support the requirements of the storage industry, andit is involved with several standards.2.1 Industry DocumentsThe following interface standards and specifications are relevant to thisspecification.HD Management Interface Page 5