XVME-240 Manual
October, 1984
Table 2-6. Interrupt Level Options
Switches
3
2
1
0 0 0
0 0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
Level
No Level selected
Level 1
Level 2
Level 3
Level 4
Level 5
Level 6
Level 7
NOTE
Open =
Logic
"1"
Closed = Logic "0"
2.4.7
BGxIN*/BGxOUT* Daisy Chain
The Data Bus Arbitration signals BGxIN* and BGxOUT* (where "x" can be a number
O-3 to represent the three levels of arbitration) are not used by the DIO, and are
hardwired together on the module to allow the BGxIN*/BGxOUT* Daisy Chain to pass
through the backplane slot occupied by the DIO. In each slot of the VMEbus
backplane, there are four sets of jumpers shorting the signal BGxIN* to BGxOUT* (x=0
thru 3). Since these signals are already hardwired on the DIO, it is not necessary to
insert these VMEbus jumpers on the slot occupied by the DIO.
2.4.8
Interrupt Input Edge Detection Option
There are 8 interrupt input lines on the DIO module which allow externally connected
devices to generate VMEbus interrupts on any level (11-17). The user has the
option
to
control whether the board will latch the interrupt input
signals
on the low to
high
transition of the input or on the high to low transition of the
input.
The jumpers which control interrupt input edge selection are labeled J3-J10 (refer to
Figure 2-l for the location of these jumpers). The edge select jumpers correspond to
the interrupt input lines in the following fashion:
Edge Select Jumper
Interrupt Input Line
33
J4
J5
J6
J7
J8
J9
Jl0
INTO
INTl
INT2
INT3
INT4
INT5
INT6
INT7
2-9
