1.1 Topologies in SAS Interface
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1.1.1 SAS Layering As shown in Figure 1.2, for SAS, the following six control layers are defined:
• Physical layer: Electric properties related to cables, connectors,
and signals
• Phy (transceiver) layer: 8B/10B code, OOB, and speed negotiation
• Link layer: Primitives, address frames, and connection control
• Port layer: Wide port control
• Transport layer: Frame control
• Application layer: SCSI commands, mode pages, and log pages
Physical layer
Phy layer
Link layer
Port layer
Transport layer
Application layer
Figure 1.2 SAS control layers