Hitachi ULTRASTAR 15K450 HUS154530VLF400 - Manual (Page 37)

Hitachi Ultrastar 15K450 (FC-AL) Hard Disk Drive Specification
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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.
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.
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.
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).
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)
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