Fujitsu MBC2036RC, MBC2073RC, MBA3300RC, MBA3147RC, MBA3073RC specifications SAS OOB sequency, 3 4 n

SAS Interface

Figure 1.9 describes SAS OOB signal detection by the SP receiver.

COMRESET/COMINIT

1 2 3 4 n

Any transitions		COMINIT
	COMINIT	negation
	detected

1

Any transitions

idle

COMSAS

2 3 4

n nth idle/Burst pair

n

COMSAS

negation

COMSAS detected

ALIGN burst

idle/Burst pair

Figure 1.9 OOB signal detection

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.

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