Lvd Diffsens Driver Specifications; Diffsens Receiver Operating Requirements - Fujitsu MAN3184 SERIES Specifications

(2) DIFFSENS
a) DIFFSENS driver
The LVD DFFSENS driver sets a voltage level on the DIFFSENS line that uniquely defines a
LVD transmission mode. LVD terminators and multimode terminators shall provide a LVD
DIFFSENS driver according to the specifications in Table 1.8.
Value
V [V] when I =0
O O
(shorted to ground) to 5mA
I [mA]
OS
|Input current DC|( A)
Input sink current D.C. ( A) at
V =2.75V
O
b) DIFFSENS receiver
LVD SCSI devices shall incorporate a LVD DIFFSENS receiver that detects the voltage level
on the DIFFSENS line for purposes of informing the device of the transmission mode being
used by the bus. The LVD DIFFSENS receiver shall be capable of detecting SE and LVD
SCSI devices. Table 1.9 define the receiver input levels for each of the two modes.
Table 1.9
The input resistance requirement is for purposes of providing ground reference if no DIFFSENS
drivers are connected to the bus and to ensure that the DIFFSENS receivers do not load the
DIFFSENS drivers excessively and to ensure that SE mode is detected.
Devices shall not allow the signal drivers to leave the high impedance state during initial power on
until both of the following conditions are satisfied:
Table 1.8

LVD DIFFSENS driver specifications

Max. Nominal
1.4
15
10
200

DIFFSENS receiver operating requirements

V range
IN
-0.35 ~ +0.5V
+0.7 ~ +1.9V
C141-E123-01EN
Min
1.3 1.2
5 - With TERMPWR at operational levels
- -
- 20 Required to prevent the line from
floating and to ensure the HVD
DIFFSENS driver dominate the LVD
Sensed differential drive type
SE
LVD
Notes
and V =0.
O
With terminator disabled.
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