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 EF20B24072603A
1 E821B141716139
2 E422AE426E6236
3 E223AD436D6335
4 E124AC446C6434
5 E025AB456B6533
6 DC26AA466A6632
7 DA27A947696731