FASTBUS READOUT SYSTEM FOR THE CDF DAQ UPGRADE

The Data Acquisition System (DAQ) at the Collider Detector at Fermilab is currently being upgraded to handle a minimum of 100 events/sec for an aggregate bandwidth which is at least 25 Mbytes/sec. The DAQ Syste m is based on a commercial switching network which has interfaces to V ME bus. The modules that read out the front end crates (FASTBUS and RA BBIT) have to deliver the data to the VME bus based host adapters of t he switch. This paper describes a read out system that has the require d bandwidth while keeping the experiment deadtime due to the read out to a minimum.