Kontron VMOD-2D - Manual (Page 34)

VMOD-2/VMOD-2D
12/15/97
Functional Description
Page 2 - 8 Man. ID 03139, Rev. Index 0200
The External Reset is limited to the VMOD-2 and it's piggybacks, and will not reset the VME-
bus unless your application software demands it to. I.e. via the polling of an output register to
detect a "reset" state.
Special note!
There can be occasions when spurious interrupts are caused with the use
of the "local" reset facility.
This can happen when a VMOD-2 IRQ is cleared by the local reset before
the VMEbus system has had a chance to clear the interrupt itself.
The two-pins (25 and 26) of the 50-way front panel connector, can be used to detect the fol-
lowing external events;
Figure 2-1: External Reset Connection — Example 1
Detect breaking of any intermediate con-
nectors between VMOD-2 and external
device. In this kind of mode their two wires are
joined to Vcc and Gnd at the furthest end.
VM OD
2
Vcc
0V or
Gnd
Breaking either of these connectors
causes a local reset to the VMOD-2
Machine
Up
p
er
pi
g
g
yb
ac
k
Lo
w
er
pi
g
g
yb
ac
k
1).