The ATLAS read out data flow control module and the TTC VME interface production status
P. Gällnö · CERN Document Server (European Organization for Nuclear Research) · 2001
The ATLAS detector data flow from the Front End to the Read Out Drivers (ROD) has to be controlled in order to avoid that the ROD data buffers get filled up and hence data getting lost.This is achieved using a throttling mechanism for slowing down the Central Trigger Processor (CTP) Level One Accept rate.The information about the state of the data buffers from hundreds of ROD modules are gathered in daisy-chained fan-in ROD-BUSY modules to produce a single Busy signal to the CTP.The features and the design of the ROD-BUSY module will be described in this paper.The RD-12 TTC system VMEbus interface, TTCvi, will be produced by an external electronics manufacturer and will then be made available to the users via the CERN EP/ESS group.The status of this project is given.