Digital's Storage Systems Interconnect

This document outlines the architecture for the Digital Storage Systems Interconnect (DSSI), a high-performance interconnect designed for low-end and mid-range systems. It details:

• Architectural Layers: Describes the integration of common host/port protocols with unique datalink and physical layers.
• DSSI Bus Protocol: Covers bus arbitration, physical bus phases (Arbitration, Selection, Command Out, Data Out, Status In), and timing specifications.
• Electrical & Physical Specifications: Provides requirements for line drivers, terminator packages, connectors, and cable requirements.
• Implementation & Exceptions: Includes appendices detailing implementation functionality for specific products (e.g., KFQSA, SHAC, DASH) and exceptions for products using the SII chip.
• Diagnostic Counters: Defines performance monitoring and diagnostic counter events.