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SAS -3, Speed Negotiation Decodes
TraceView uses timing values and other criterion to determine events reported for speed
negotiation using OOB signals. The description of how TraceView determines these events are
shown in the table below for SAS-3.
Table 21: SAS -3, Speed Negotiation Decodes
Speed Negotiation Decode
SNW-2 Begin
SNW-2 End
Valid SNW-2 detected
Invalid SNW-2 detected
SNW-3 Begin
SNW-3 End
Valid SNW-3 detected
Invalid SNW-3 detected
SNW-3 phy capabilities bits
Begin
SNW-3 phy capabilities bits End
SNW-3 phy capabilities bit
SNW-3 phy capabilities value
Final-SNW (3.0 Gbps) Begin
Final-SNW (3.0 Gbps) End
Valid Final-SNW (3.0 Gbps)
detected
Xgig Analyzer User's Guide
Chapter 13, Configuring Xgig TraceView
Event Description
This event marks the beginning of the SNW-2 window of the SAS
speed negotiation sequence.
This event marks the end of the SNW-2 window of the SAS speed
negotiation sequence.
This event is set when the analyzer receives ALIGN(1) primitives
from both ends of a SAS link at 3.0 Gbps during SNW-2 window of
the SAS speed negotiation sequence.
This event is set when the analyzer does not receive ALIGN(1)
primitives from one or both ends of a SAS link at 3.0 Gbps during
SNW-2 window of the SAS speed negotiation sequence.
This event marks the beginning of the SNW-3 window of the SAS
speed negotiation sequence.
This event marks the end of the SNW-3 window of the SAS speed
negotiation sequence.
This event is set when the analyzer receives one or more SAS-2
SNW-3 phy capabilities bits transmitted as COMWAKE OOB signals
during SNW-3 window of the SAS speed negotiation sequence.
This event is set when the analyzer receives no SAS-2 SNW-3 phy
capabilities bits during SNW-3 window of the SAS speed negotiation
sequence.
This event is set to indicate the beginning of SNW-3 phy capabilities
bits transmission window during SNW-3.
This event is set to indicate the end of SNW-3 phy capabilities bits
transmission window during SNW-3.
This event is set when a COMWAKE OOB signal is received during
the SNW-3 window to indicate the specific SNW-3 phy capabilities bit
received.
This event is set to indicate the 32-bit SNW-3 phy capabilities value
received during SNW-3 window. The 32-bit value has bit 0 (START
bit) as the MSB and bit 31 (PARITY bit) as the LSB.
This event marks the beginning of the Final-SNW speed negotiation
window at 3.0 Gbps rate.
This event marks the end of the Final-SNW speed negotiation
window at 3.0 Gbps rate.
This event is set when the analyzer receives ALIGN(1) primitives
from both ends of a SAS link at 3.0 Gbps rate during Final-SNW
window of the SAS speed negotiation sequence.
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