FPGA based Readout Logic of the Front-end Electronics of the ATLAS Absolute Luminosity Monitor

Readout of data from front-end electronics of the ATLAS Absolute Luminosity Monitor is controlled by programmable devices. Alfa-R is a local readout controller which reads digitized data with LHC clock and keeps them until validation of the first level trigger. Alfa-M is a global readout controller which reads validated events from 23 Alfa-R controllers, forms a data block and sends it to an acquisition system. In this article, description of logic of both controllers is presented as well as is shown how the controllers can be set up and monitored from an user level.