The Enable Machine is a systolic 2nd level trigger processor for the transition radiation detector (TRD) of ATLAS/LHC. The task of the processor is to find the best candidate for a lepton track in a high background of pions according to the EAST benchmark [2] in less than 10 5s. As described earlier [1, 2] the Enable Machine finds all reasonable tracks by histogramming the coincidence of the mask templates and the RoI for each track. A prototype has been developed and tested within the EAST/RD-11 collaboration at CERN. It operates at 50 MHz and finds up to 400 arbitrary tracks in less than 10 5s. It is assembled of an interface board and one or more histogrammer boards which makes the Enable Machine easily scalable. The histogrammer units are systolic arrays consisting of a matrix of 36 field- programmable gate arrays (Xilinx XC3190). Through this it is possible to optimize the trigger algorithm, to adapt it to a changed detector setup, and it allows even the implementation of completly new algorithms. For the beam tests in autumn 1993 at CERN the overall functionality within the detector environment could be shown. We were able to link successfully the Enable prototype to the detector raw data stream as well as to the data acquisition system. For the next beam period in 1994 we will focus on efficiency measurements and tests with maximal detector data rate.
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