Active Led Out; Enable Port Bypass Signals; Motor Start Controls - Seagate CHEETAH NS 10K.2 FC ST3600002FC Product Manual

9.5.8

Active LED Out

The Active LED Out signal is driven by the drive as indicated in Table 24.
Table 24: Active LED Out conditions
Normal command activity
Spun down and no activity
Spun down and activity (command executing)
Spun up and no activity
Spun up and activity (command executing)
Spinning up or down
Format in progress
Write Same command in progress
The Active LED Out signal is designed to pull down the cathode of an LED. The anode is attached to the
proper +5 volt supply through an appropriate current limiting resistor. The LED and the current limiting resistor
are external to the drive.
9.5.9

Enable port bypass signals

The – Enable Bypass Port A (– EN BYP Port A) and – Enable Bypass Port B (– EN BYP Port B) signals control
the port bypass circuits (PBC) located external to the disk drive. The PBC allows a loop to remain functional in
the event of a drive failure or removal. When these signals are active, low, the PBC bypasses the drive on the
associated port. When an Enable Bypass signal is active, the corresponding Port Bypass LED signal in con-
nector J1 is driven low by the disk drive. A pull down resistor, 1K, located with the PBC should be used to
insure the bypass is enabled if the disk drive is not installed.
The Enable Bypass signal is active under failing conditions within the drive, on detection of the Loop Port
Bypass primitive sequence, or on removal of the drive. In the bypass state the drive continues to receive on the
inbound fibre. Enable Bypass may be deactivated by detection of a Loop Port Enable primitive sequence if the
drive has completed self-test and a hardware failure is not present.
Failure modes detected by the disk drive that will enable bypass include:
• Transmitter/receiver wrap test failure
• Loss of receive clock
• Loss of transmission clock
• Drive interface hardware error
9.5.10

Motor start controls

The drive's motor is started according to the Start_1 and Start_2 signals described in Table 25. The state of
these signals can be wired into the backplane socket or driven by logic on the backplane.
Table 25: Motor start control signals
Case Start_2
1 Low
2 High
3 Low
68
LED status
Slow blink (20% on and 80% off a 2 sec cycle)
On
On
Off
Blinks steadily (50% on and 50% off)
Toggles on/off
Togles on/off
Start_1 Motor spin function
Low Motor spins up at DC power on.
Low Motor spins up only when SCSI Start command is received.
High Motor spins up after a delay of 12 seconds times the modulo 8 value
of the numeric SEL ID of the drive from DC power on.
Cheetah NS 10K.2 FC Product Manual, Rev. B