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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:
•
Phy (transceiver) layer: 8B/10B code, OOB, and speed negotiation
•
Link layer:
•
Port layer:
•
Transport layer:
•
Application layer:
C141-C012
Electric properties related to cables, connectors,
and signals
Primitives, address frames, and connection control
Wide port control
Frame control
SCSI commands, mode pages, and log pages
Application layer
Transport layer
Port layer
Link layer
Phy layer
Physical layer
Figure 1.2 SAS control layers
1.1 Topologies in SAS Interface
1-3
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