Real-time data processing in the muon system of the D0 detector

This paper presents a real-time application of the 16-bit fixed point Digit al Signal Processors (DSPs), in the Muon System of the DO detector located at the Fermilab Tevatron, presently the world's highest-energy hadron colli der. As part of the Upgrade for a run beginning in the year 2000, the syste m is required to process data at an input event rate of 10 KHz without incu rring significant deadtime in readout. The ADSP21csp01 processor has high I/O bandwidth, single cycle instruction execution and fast task switching support to provide efficient multisignal processing. The processor's internal memory consists of 4K words of Program Memory and 4K words of Data Memory. In addition there is an external memor y of 32K words for general event buffering and 16K words of Dual Port Memor y for input data queuing. This DSP fulfills the requirement of the Muon sub detector systems for data readout. All error handling, buffering, formattin g and transferring of the data to the various trigger levels of the data ac quisition system is done in software. The algorithms developed for the syst em complete these tasks in about 20 mu s per event.