Hitachi HUS154530VLF400 User Manual
Hitachi Ultrastar 15K450 (FC-AL) Hard Disk Drive Specification
21
7.1.5 Start Mated Controls
The Start_X Mated signals are TTL inputs to the drive and have 10K ohm pull-up resistors.
As per the SFF-8045 specification, the 'Start_x Mated' function is implemented as in the following table. Please refer to SFF-
8045 for a more complete definition.
8045 for a more complete definition.
Table 13: Start/Mated Controls
7.1.6 SEL_n and Enclosure Service Signals
These signals have different definitions depending on the state of -Parallel ESI and the level of enclosure service supported by
the backplane.
the backplane.
7.1.6.1 SEL_n and Enclosure Service Signals
-Parallel ESI is a TTL open-drain output from the drive. It is used to establish the definition of the SEL_n signals. When -Par-
allel ESI is de-asserted (high), the backplane shall preset SEL_ID information on these signals (within 1usec). When -Parallel
ESI is asserted (low), the backplane (if supported) will present enclosure service information on these signals (within 1usec).
The drive will then go through a 'discovery' phase to determine the level of enclosure services that the backplane supports (i.e.
none, SFF-8045, or SFF-8067) and behave accordingly.
allel ESI is de-asserted (high), the backplane shall preset SEL_ID information on these signals (within 1usec). When -Parallel
ESI is asserted (low), the backplane (if supported) will present enclosure service information on these signals (within 1usec).
The drive will then go through a 'discovery' phase to determine the level of enclosure services that the backplane supports (i.e.
none, SFF-8045, or SFF-8067) and behave accordingly.
7.1.6.2 SEL_ID Function
The SEL_n (TTL compatible) inputs (defined when -Parallel ESI is de-asserted) provide a binary value of loop identifier to the
drive. These 7 signals define 128 possible values and are directly translated into an 8 bit hard AL_PA via the table below. Only
AL_PA's with neutral disparity are valid values. The drive will attempt to acquire this hard AL_PA for its own during the
LIHA phase of the loop initialization process (LIP).
drive. These 7 signals define 128 possible values and are directly translated into an 8 bit hard AL_PA via the table below. Only
AL_PA's with neutral disparity are valid values. The drive will attempt to acquire this hard AL_PA for its own during the
LIHA phase of the loop initialization process (LIP).
Table 14: SEL_ID/AL_PA
Start_2 Mated
Start_1 Mated
Spin Function
Open
Open
Drive is not mated. No spin-up will occur.
Open
Gnd
The motor will spin up with the SCSI Unit Start Cmd
Gnd
Open
The motor will spin up after a delay of 6 times the modulo 8 of
Sel_ID (in seconds)
Sel_ID (in seconds)
Gnd
Gnd
The motor will spin up after drive initialization
SEL_ID
AL_PA
SEL_ID
AL_PA
SEL_ID
AL_PA
SEL_ID
AL_PA
0
EF
20
B2
40
72
60
3A
1
E8
21
B1
41
71
61
39
2
E4
22
AE
42
6E
62
36
3
E2
23
AD
43
6D
63
35
4
E1
24
AC
44
6C
64
34
5
E0
25
AB
45
6B
65
33
6
DC
26
AA
46
6A
66
32
7
DA
27
A9
47
69
67
31