Installation
Quantum Atlas 10K II Ultra 160/m SCSI Hard Disk Drives 3−13
Figure 3–5 Pin Locations on SCA-2 Connector
Table 3–3 SCSI ID Pin Assignments (SCA-2 Connector Versions of the Disk Drive)
3.4.2.3 Spin Up for SCA-2 Connector Versions
Atlas 10K II drives with SCA-2 SCSI connectors have three Spin Up modes:
• Option 1 Spin up occurs immediately when power is applied.
• Option 2 Drive spin up occurs after a predetermined delay following power on.
Set the delay parameters with the MODE SELECT Command,
Quantum-Unique Page (39h).The delay is equal to a user-specified
multiplier multiplied by the numerical SCSI ID of the drive. This
will give a staggered spin-up in multiple-drive installations.
• Option 3 Drive spin up is controlled by the START STOP UNIT command.
Configure the desired spin up option (Table 3-4) by setting the state of the
DELAY_SPIN (Pin 38) and STAGGER_SPIN (Pin 78) inputs on the 80-pin SCA-2
connector (Figure 3-5). The states of these signals are set by using either hard-wired
connections at the backplane or backplane logic.
Pin 40 Pin 39
Pin 80 Pin 79 HDA
Location on SCA Connector
SCSI ID ID3 - Pin 80 ID2 - Pin 40 ID1 - Pin 79 ID0 - Pin 39
00000
10001
20010
30011
40100
50101
60110
70111
81000
91001
10 1 0 1 0
11 1 0 1 1
12 1 1 0 0
13 1 1 0 1
14 1 1 1 0
15 1 1 1 1
0 = Open Circuit, +2.4 V to Vcc +0.5 V
1 = Ground, -0.5 V to +0.4 V
Pin 2 Pin 1
Pin 42 Pin 41