Sas Oob Sequency; Figure 1.9 Oob Signal Detection - Fujitsu MAU3147RC SERIES Technical Manual

Serial Attached SCSI (SAS) Interface
Figure 1.9 describes SAS OOB signal detection by the SP receiver.
1
Any transitions
Any transitions
idle
ALIGN burst

1.3.5 SAS OOB sequency

During the OOB sequence, the INIT and the drive first send the COMINIT signal
to each other, then the COMSAS signal. When they both have received the
COMSAS signal from each other, the OOB sequence is recognized as having
been performed successfully. Depending on the power-on timing, reception of
the COMINIT signal from the other side may not be detected. In such a case,
however, the OOB sequence is recognized as having been performed successfully
if the COMINIT and COMSAS signals have been sent by the time the COMSAS
signal from the other side is received.
When the OOB sequence is successful, the SAS speed negotiation sequence
starts.
Figure 1.10 shows several different SAS OOB sequences between phy A and phy
B, with phy A starting the SAS OOB sequence at the same time as phy B, before
phy B, and before phy B powers on.
1-16
COMRESET/COMINIT
2 3 4 n
COMINIT
detected
COMSAS
2 3
1
nth
n
idle/Burst pair
idle/Burst pair

Figure 1.9 OOB signal detection

COMINIT
negation
n
4
COMSAS
negation
COMSAS
detected
C141-C009