GALLNO!!Per!!per.gallno@cern.ch!!CERN!!CERN Division EP 1211 GENEVE 23!! !! !!SWITZERLAND!!GENERAL INTEREST!!TRIG!!Trigger electronics!!Modules Development for the TTC system!!990430007

RD12 collaboration
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The RD12 optical timing, trigger and control (TTC) system will be used
by the LHC experiments. 
A VME interface (TTCvi) allowing to drive a TTC network has been
developped. This module allows to select different clock and trigger
sources and to transmit data and commands on the network. 
A simple receiver (TTCsr) PMC module housing a TTC receiver chip (TTCrx)
and making available the timing and trigger signals on the front pannels
and the TTC data and commands in PCI accessible FIFOs has also been
designed. It is used in the ATLAS data acquisition prototype (DAQ-1). An
upgraded version of this module will be presented.
A VME optical transmitter (TTCvx) has been designed in order to make
available a cheap and small "TTC crate" to the users for laboratory
applications.
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Several modules driving or using the RD12 optical timing, trigger
and control (TTC) system have been designed. A presentation of the 
current status and of the future developments will be done.

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