Internal Terminal Resistor And Power Supply For Terminating Resistor; Circuit For Mated Indications; Requirements For Terminating Resistor Power Supply - Fujitsu MAN3184 SERIES Specifications

(4) MATED 1/Backplane Side
The signal shall be held to a ground level when the MATED 2 connection is completed. The
MATED 1 signal shall be held to the open level when the MATED 2 connection is not completed.
1.4.3

Internal terminal resistor and power supply for terminating resistor

The TERMPWR signal of the interface connector supplies the power to the terminating resistor
circuit connected to both ends of the cable. To attach a terminating resistor to an external SCSI
device or to cut the power of SCSI device having a terminator, the terminator power must be
supplied to the TERMPWR line from any of SCSI devices of the bus. The SCSI device (such as a
host adapter) which always operates as the INIT should supply the power. The terminating resistor
power shall be supplied to the TERMPWR line through a diode to prevent a reverse current.
Table 1.10 lists the requirements for terminating the resistor power supply (Vterm).
Table 1. 10 Requirements for terminating resistor power supply
Terminator Power
Characteristics
I (A)@V
min min
V (V)@I
min min
V (V)@ all
max
conditions
MATED 2
connection
Figure 1.15 Circuit for mated indications
SE (P Cable)
0.2V dropout
regulator
0.6 0.6
2.7 4.0
5.25 5.25
C141-E123-01EN
Terminator Type
LVD
0.5
3.0
5.25
SE and LVD
type
(Multimode)
0.65
3.0
5.25
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