The conventional approach to build data acquisition systems is based on parallel bus architectures. A parallel bus in the front-end connects the detector video data digitizing modules to a communication module for further transfer to the back-end. This bus already poses serious design challenges when the number of modules varies between systems, especially if the bus clock frequency is high. In addition, the bus busy time may determine the maximum sample rate for large systems because during bus transfer conversion accuracy may be affected by coupling digital artifacts into the analog chain. For system setup and communication an additional structure is needed, which adds complexity to the system. On the New
General detector Controller (NGC) the parallel buses are replaced with high speed point to point serial links carrying data and communication transfers.
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