Figure 1.12 Sas Speed Negotiation Sequence (Example 1); Figure 1.13 Sas Speed Negotiation Sequence (Example 2) - Fujitsu MAU3147RC SERIES Technical Manual

Phy A Tx/
Phy B Rx
Phy A Rx/
Phy B Tx
ALIGN(0)s

Figure 1.12 SAS speed negotiation sequence (Example 1)

If the phy does not obtain dword synchronization during the final speed negotiation
window, the SAS speed negotiation sequence fails.
Figure 1.13 shows the same speed negotiation sequence as in Figure 1.12 when phy B
does not obtain dword synchronization during the final speed negotiation window. If
this occurs, the handshake is not complete and the OOB sequence shall be retried
starting with COMINIT, forcing the phy to retry the whole reset sequence.
RCD
Phy A Tx/
Phy B Rx
RCD
SNTT
Phy A Rx/
Phy B Tx
G1 rate
ALIGN(0)s

Figure 1.13 SAS speed negotiation sequence (Example 2)

C141-C009
dword
no dword
sync
RCD RCD
SNTT
SNTT
dword
RCD RCD
sync
SNTT
Not supported
by phy B
G1 rate G2 rate
Time z: SAS speed negotiation sequence begins
ALIGN(1)s
dword dword
sync sync
RCD RCD
SNTT SNTT
dword dword
sync sync
RCD RCD
SNTT
G2 rate
Time z: SAS speed negotiation sequence begins
ALIGN(1)s
no dword
sync sync
RCD
RCD
SNTT
RCD
SNTT SNTT
Not supported
by phy B
G3 rate
(negotiated rate)
Time
no dword dword
sync sync
SNTT
SNTT
no dword
sync
RCD
SNTT
SNTT
G3 rate G2 rate
(negotiated rate)
Time
1.3 Phy layer
dword
sync
SNTT
dword
sync
SNTT
G2 rate
COMINIT
COMINIT
Hot Plug
Timeout delay
1-21