Maxtor ATLAS 10K IV User Manual page 120

SCSI Description
5.14.12.1 Margin Control Subpage (Sub Page 1 of Mode Page 19)
The Margin Control subpage (see Table 5-76) contains parameters that set and report
margin control values for usage between the initiator/target pair on subsequent
synchronous and paced transfers.
A MODE SELECT command will return the current settings for the initiator/target
pair. Fields that are not implemented will be reported as zero.
Bit
7
Byte
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
The Driver Strength field indicates the relative amount of driver source currently
used by the driver. The Driver Strength field affects both the strong and week drivers.
A larger value indicates more driver source current.
The Driver Precompensation field indicates the relative difference between the weak
driver and the strong driver amplitudes when precompensation is enabled. A larger
value indicates a larger difference between the weak and strong amplitudes.
The Driver Asymmetry field indicates the relative difference between the amplitudes
of asserted and negated signals launched from the driver. A larger value indicates a
relatively stronger asserted signal compared to the negated signal.
The Driver Slew Rate field indicates the relative difference between the assertion and
negation magnitudes divided by the rise or fall time. A larger value indicates a faster
slew rate.
5-54 Maxtor Atlas 10K IV
Margin Control Subpage (01h)
Table 5-76
6 5
Driver Strength
Drive's Asymmetry
Drive's Slew Rate
4 3 2
Reserved
Reserved
Driver Precompensation
Reserved
Reserved
Reserved
Reserved
Vendor Specific
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
1 0