Fujitsu MBA3300RC, MBC2036RC Start conditions of the link reset sequence, Out of band OOB signals

1.3 Phy layer

1.3.3 Start conditions of the link reset sequence

Drives start the link reset sequence when they detect any of the following conditions:

∙The power is turned on.

∙A loss of signal is detected (OOB from the INIT).

∙A loss of sync is detected.

∙A HARD_RESET primitive is received during the link reset sequence.

∙A hot-plug timeout (500 ms) is detected during the link reset sequence.

∙The IDENTIFY address frame could not be received.

1.3.4Out of band (OOB) signals

Out of band (OOB) signals are low-speed signal patterns detected by the phy that do not appear in normal data streams. They consist of defined amounts of idle time followed by defined amounts of burst time. During the idle time, D.C. idle is transmitted. During the burst time, ALIGN (0) primitives are transmitted repeatedly. The signals are differentiated by the length of idle time between the burst times.

Table 1.4 OOB signal timing specifications

Parameter		Minimum	Nominal	Maximum	Comments
OOB interval					The time basis for burst times and
					idle times used to create OOB
(OOBI) *1		666,600 ps	666,666 ps	666,733 ps
					signals. Based on 1,5 Gbps clock
					tolerance.
					The minimum time a receiver shall
COMSAS detect		13,65 ìs	−	−	allow to detect COMSAS after
timeout					transmitting COMSAS.
					Derived from: OOBI × 512 × 40
	*1 The OOBI is different from the UI (OOB) defined in SATA (for example,
		stricter clock tolerance applies to SAS). This is because the OOBI is a
		fixed value that is equal to the UI value of G1, and that does not depend on
		actual transfer speed used to set up the burst time.

Table 1.5 describes the OOB signal transmitter requirements for the burst time, idle time, and negation times that comprise each OOB signal.

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