Maxtor Atlas 10K V Product Manual page 112

5.12.12.1 Margin Control Subpage (Sub Page 1 of Mode Page 19)
The Margin Control subpage (see Table 5-74) 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
Byte
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Field
Driver
Strength
Driver Pre-
compensation
Driver
Asymmetry
Driver Slew
rate
5-54 Maxtor Atlas 10K V
Table 5-74
Margin Control Subpage (01h)
7 6 5
Driver Strength
Drive's Asymmetry
Drive's Slew Rate
Table 5-75
The DRIVER STRENGTH field indicates the relative amount of driver source cur-
rently 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 asser-
tion and negation magnitudes divided by the rise or fall time. A larger value indicates
a faster slew rate.
4 3
Reserved
Driver Precompensation
Reserved
Reserved
Reserved
Vendor Specific
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Field Descriptions
Description
2 1 0
Reserved
Reserved