Hitachi Ultrastar 15K147 SCSI Hard Disk Drive Specification
134
17.10.11.3 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 initia-
tor.
•
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 ampli-
tudes.
•
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 compared 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.
Table 87: Margin Control Subpage
Byte
Bit
7
6
5
4
3
2
1
0
0
RSVD
1
Driver Strength
RSVD
2
Driver Asymmetry
Driver Precomenstation
3
Driver Slew Rate
RSVD
4
|
6
RSVD
7
Vendor Specific
8
|
15
RSVD
Summary of Contents for HUS151414VL3600
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