Chapter 5
SCSI Physical Characteristics
Page 54
Filepro CFP4207 Series
Spindle Sync
The spindle rotation of up to 35 drives may be synchronized together by daisy
chaining pin 1 to pin 1 and pin 2 to pin 2 of each drive on connector J3. The
spindles are synchronized using a "floating master" concept, where the drives
will synchronize to the first drive to reach full speed. The synchronization
tolerance is 1%.
Table 5-4
Electrical Characteristics for the Spindle Sync Signal
STATE
Current
Voltage
High
0 < I
IH
< 20
µ
A
2.5 V < V
IH
< V
CC
+ 0.3 V
Low
0 < I
OH
< -48 mA
-0.1 V < V
IL
< 0.4 V
LED Out
The LED out signal is driven by the drive when the drive is performing a SCSI
operation. The LED out signal is designed to pull down the cathode of an LED.
The anode is attached to the 5 volt supply through an appropriate
current limiting resistor. The LED and the current limiting resistor are external
to the drive.
Table 5-5
Output Characteristics of the LED Driver Signal
State
Current Drive Available
Output Voltage
Drive LED Off
0 < I
OH
< 100
µ
A
Drive LED On
I
OL
< -30 mA
0 < V
OL
< 0.8 Volts
Motor Start Controls
Table 5-6
Electrical Characteristics for RMT_START and DLYD_START
State
Current
Voltage
Open
0 < I
IH
< +100
µ
A
2.4 V < V
IH
< V
CC
+ 0.5 V
Ground
0 < I
OH
< -3 mA
-0.5 V < V
IL
< 0.4 V
SCSI ID Selection
Table 5-7
Electrical Characteristics for the SCSI ID Signals SCSI ID (0) - (3)
State
Current
Voltage
Open
0 < I
IH
< +100
µ
A
2.4 V < V
IH
< V
CC
+ 0.5 V
Ground
0 < I
OH
< -3 mA
-0.5 V < V
IL
< 0.4 V
