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User's Manual (MUT)
Mod. V977 16 Channel I/O Register (Status A)
27/08/2004
1
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00118/01:V977X.MUTX/01
V977_REV1.DOC
21
5
1. Overview
1.1. Module description
The Mod. V977 is a 1-unit wide VME module that can work either as 16 channel general
purpose I/O Register or as Multihit Pattern Unit; the operating mode is selected via VME
and is signalled via front panel LED.
The module has 16 channels; each channel is provided with one input and one output
connector. Input signals can be indifferently NIM or TTL; an on-board switch allows to
select between NIM and TTL signals for the outputs.
2 LEDs signal the I/O status of each channel.
The module features an additional channel (TEST CHANNEL), which allows to send a
test pulse via a front panel pushbutton. The TEST output signal can be either NIM or TTL,
selected with the same on-board switch of the channels output.
Input signals can be individually masked via VME or globally via a front panel GATE
input. The channel status can be cleared either via VME or via the front panel common
CLEAR input. GATE and CLEAR signals can be indifferently NIM or TTL.
The channels global OR and /OR outputs are available as front panel signals and can be
eventually masked; OR and /OR can be either NIM or TTL, selected with the same on-
board switch of the channels output.
The module houses also a fully programmable VME RORA INTERRUPTER that
generates a VME interrupt request when the OR of a selected set of output channels has
a TRUE status.
The module uses the VME P1 and P2 connectors, then it fits into both standard and V430
VMEbus crates.
All the models have a special circuitry that allows the board to be removed from and
inserted in a powered crate without switching the crate off (Live Insertion).
