Fujitsu MAT3300FC User Manual

1-18 

C141-C008 

(3)  Active LED out 

The signal indicates that the drive starts and is active. 

Two alternative indication pattern is defined in SFF-8045 Specification Rev 4.2. 

One is “hot plug implementation” for the drives in hot plugged environments. 

The other is “legacy implementation” where the compatibility with previous SCSI 
indication system is required. 

The drive supports hot plug implementation described below. 

a)  The Active LED out signal does not light if the drive is not connected. 

b)  The Active LED out signal blinks for approximately 0.5 sec. intervals when 

the drive is spinning.  It turns to light when the drive is ready. 

c)  The Active LED out signal blinks for approximately 0.5 sec. intervals when 

the drive is spin-down.  It is turned off when the drive is not ready. 

d)  The Active LED out signal is turned off when the SCSI command is received 

by the drive and during processing.  And it changed to blink when the 
command processing is completed. 

e)  The Active LED out signal blinks for approximately 1.0 sec. intervals during 

being processed Format Command. 

(4) Start_1/Mated, Start_2/Mated 

These signals controls the method to start the drive’s motor as described Table 
1.11. 

Also the signals are used to indicate to the drive that the drive has been mated to a 
backplane. 

Case Start_2/ 

Mated 

Start_1/ 

Mated 

Function 

1 open open 

Drive is not mated to a backplane.  The drive’s motor does NOT 
spin up. 

2 open ground 

Drive is mated to a backplane.  The drive’s motor spins up when 
the drive receives SCSI start command after a mating deskew 
time has passed. 

3 ground 

open 

Drive is mated to a backplane.  The drive’s motor spins up after 
a delay after a mating deskew time has passed. 

4 ground 

ground 

Drive is mated to a backplane.  The drive’s motor spins up 
immediately after a mating deskew time has passed.