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1.3 Phy layer
C141-C013 39
ALIGN(0)s
ALIGN(1)s
Speed negotiation lock time(SNLT)
Speed negotiation transmit time(SNTT)
Rate change delay time
(RCDT)
Speed negotiation window
Figure 1.11 SAS speed negotiation window
Table 1.9 defines the timing specifications for the SAS speed negotiation
sequence.
Table 1.9 SAS speed negotiation sequence timing specifications
Parameter Time Comments
Rate change delay
time (RCDT)
750 000 OOBI
The time the transmitter shall transmit D.C.
idle between rates during speed negotiation.
Speed negotiation
transmit time (SNTT)
163 840 OOBI
The time during which ALIGN(0) or
ALIGN(1) is transmitted at each physical link
rate during the speed negotiation sequence.
Derived from: OOBI x 4096 x 40.
Speed negotiation
lock time (SNLT)
153 600 OOBI
The maximum time during the speed
negotiation window for a transmitter to reply
with ALIGN(1). Derived from:
OOBI x 3840 x 40
Speed negotiation
window time
913 840 OOBI
The duration of a speed negotiation window.
Derived from: RCDT + SNTT.
The speed negotiation sequence shall consist of the following transmission
sequence:
1) a transmission of D.C. idle for an RCDT; and
2) if the phy supports the physical link rate, a transmission of ALIGNs at that
physical link rate for the remainder of the entire speed negotiation window. If
the phy does not support the physical link rate, transmission of D.C. idle for
the remainder of the entire speed negotiation window.