Reference Guide

Chapter 4 SCSI Commands
LOG SENSE Command (4Dh)
DLT-S4 Interface Reference Guide 80
Figure 38 shows the format for a SAS log parameter.
Figure 38 SAS Phy Control
and Discover Log Page —
Parameter Format
Table 50 SAS Phy Control and
Discover Log Page Subpage —
Field Descriptions
Bit
Byte
7 6 5 4 3 2 1 0
0 — 1
(MSB)
Parameter Code (Relative Target Port Identifier)
(LSB)
2 DU
DS TSD ETC TMC LBIN LP
3 Page Length (34h)
4 Reserved Protocol Identifier (6h)
5 Reserved
6 Reserved
7 Number of Phys
8 — 55 SAS Phy Log Descriptor (see figure 39)
Field Description
Parameter
Code
The parameter code field contains the relative target port identifier (see SPC-3) for the
SSP target port that this log parameter describes.
Parameter
Control Byte
Bit Value Description
DU 0 Disable Update.
DS 0 Disable Save.
TSD 0 Target Save Disable.
ETC 0 Enable Threshold Comparison.
TMC any Threshold Criteria Met.