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OEM FUNCTIONAL SPECIFICATION ULTRASTAR XP (DFHC) SSA MODELS 1.12/2.25 GB - 1.0" HIGH
5.3 SSA Link Cable
The SSA link cable must meet the specifications described in the Electrical Specifications section of Serial
Storage Architecture SSA-PH (Transport Layer), X3T10.1/94-015 rev 01.
5.4 SSA Link Electrical Characteristics
The drive SSA link line driver, line receiver, and line receiver termination are fully compliant with the specifi-
cations described in the Electrical Specifications section of Serial Storage Architecture SSA-PH (Transport
Layer), X3T10.1/94-015 rev 01.
5.5 Option Pins and Indicators
Ultrastar XP SSA drives contain option pins and/or indicators used to sense and report fault conditions, and
to enable certain features of the drive. The electrical characteristics and requirements of these pins are fully
compliant with the specifications described in the Electrical Specification section of Serial Storage Architec-
ture SSA-PH (Transport Layer), X3T10.1/989D rev 01. The existence and definition of these pins are model
dependent. Refer to Figure 14 on page 56 and Figure 18 on page 62 for locations of pins and LEDs on
the front of the drive. Refer to Table 11 on page 64 and Table 12 on page 65 for locations of pins on the
rear of the drive.
5.5.1 - Manufacturing Test Mode (Option Port Pin 1)
A low active input pin, that when active (pulled below .8V) makes pins 2, 3, 4, 6, 8 ,9 and 10 available to
be redefined. Pins 5 and 7 must remain Ground and +5V respectively. One possible purpose for this pin is
to allow a manufacturing tester to redefine the option pins to whatever functions it desires, while allowing
the shipped product to return to the standard definitions in the customers environment. All models (CxC
and CxB) reserve this pin but it is not connected to any internal logic.
5.5.2 - Auto Start Pin (Option Port Pin 2)
A low active input pin, that when active (pulled below 0.8 V) on CxC model causes the drive motor to spin
up and become ready for media access operations after power is applied without the need to receive a
Start/Stop Unit command. When inactive (pulled above 2.0 V), the drive motor shall not spin up until after
the receipt of a Start/Stop Unit command. The signal is to be sampled by the device at power on, or hard
reset or soft reset conditions. Refer to the "Option Pins" section of the Ultrastar XP (DFHC) SSA Models
Interface Specification for a detailed functional description of operations associated with this pin.
This pin is not accessible on CxB models.
5.5.3 - Sync Pin (Option Port Pin 3)
The Sync input/output pin on CxC model can be used for synchronizing among devices. The synchroniza-
tion is achieved by having one device uses this pin as output to transmit one sync character once per its
spindle revolution. The other node may use this pin as an input and synchronize their spindle revolution
position to match the Sync signal. The SSA network provide Sync character over SSA link, but this option
pin allows synchronization across multiple SSA networks, or allow tighter latency of the Sync pulse. Refer to
Figure 21 on page 70 for examples of Synchronization connection.
Source filename=ELECTRICIBM CorporationPage 66 of 87