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Chapter 6
Physical Layer
Objectives
This chapter describes the Physical layer of the serial implementation of ATA. Unless otherwise
des cribed, the information is normative. The information that is provided and marked informative is
provided to help the reader better understand the standards clauses and should be taken as examples
only. Exact implementations may vary.
The following Physical layer functions and services are discussed:
Out of band (OOB) signaling
○ COMWAKE
○ COMINIT
○ COMRESET
○ Initialization protocols
SATA speed negotiation
Resets and Signatures
Power states (legacy)
Built-in self-test
○ Loopback testing
PHY logic dia ...