Figure 98. Margin Control Subpage - IBM IC35L036UWDY10 - Ultrastar 36.7 GB Hard Drive Specifications

8.8.11.3 Margin Control Subpage
Byte
7
0
1 Driver Strength
2 Driver Asymmetry
3 Driver Slew Rate
4
|
6
7
8
|
15

Figure 98. Margin Control Subpage

The margin control subpage contains parameters that set and report margin control values for usage
between the initiator and the drive on subsequent synchronous and paced transfers. MODE SENSE
command returns the current settings for the initiator.
! Driver Strength indicates the relative amount of driver source current used by the driver. The Driver
Strength field affects both the strong and weak drivers. A larger value indicates more driver source
current.
! Driver Precompensation 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.
! Driver Asymmetry 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 com-
pared to the negated signal.
! Driver Slew Rate 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.
! Vendor Specific is reserved and should be zero.
The default value of each margin control field should be 0000b.
The margin control fields indicate absolute conditions centered around their default values. The maximum
supported setting for each field is 0111b and the minimum supported setting for each field is 1000b.
6 5 4
Reserved
Vendor specific
Reserved
Ultrastar 146Z10 hard disk drive specifications
Bit
3 2
RSVD
Reserved
Driver Precompensation
Reserved
106
1 0