27/09/2002
V560 User Manual
12
The operations of the V560 VME INTERRUPTER are fully software programmable; via VME it is
possible:
•
to enable /disable the VME interrupt generation;
•
to set the VME interrupt level;
•
to program the VME interrupt vector (STATUS/ID).
Moreover for each section it is possible to enable/disable the scales interrupt generation (see § 4.9).
If the VME INTERRUPTER is enabled, it generates a VME interrupt whenever the most significant bit
of an enabled scale becomes true:
•
If the section is configured with two independent 32-bit scales, it generates an interrupt when
the 32th of one of the two channels becomes true.
•
If the section is configured with one 64-bit scale, it generates an interrupt when the 64th bit of
the scale becomes true (i.e., the 32th bit of the even channel).
3.3. FRONT PANEL SIGNALS
Some operations can be performed by three external NIM signals (indicated on the front panel
connectors with "VETO", "CLEAR", "TEST"):
•
VETO: (INHIBIT) an input signal sent through this connector disables the counting.
•
CLEAR: (FAST CLEAR) an input signal present on this connector resets all the channels
(it is possible to perform the same operation by pressing the "MAN CLR" push-button
located on the front panel).
•
TEST: if the module is configured with 16 independent channels, a pulse sent through this
connector increases all the channels.
These inputs are high impedance and each one is provided with two bridge connectors for daisy
chaining.
Note that the high impedance makes these inputs sensitive to noise, so the chain has to be
terminated on 50
Ω
on the last module; the same is needed also if one module only is used, whose
inputs have thus to be properly matched.