Bonn 2010 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 48: Instrumentierung VIII

HK 48.6: Talk

Thursday, March 18, 2010, 15:15–15:30, HG VIII

Design and Implementation of the Read-Out-Controller for the GET4 chips — •Sebastian Manz and Udo Kebschull — KIP Universität Heidelberg

The ToF detector of the CBM experiment will assemble about 15000 GET4 ASICs, all clocked from the same 156.25MHz source. Those chips create a very precise timestamp from detected hits and deliver the data via a serial LVDS link to the ROC. At the moment, one ROC interfaces up to 28 GET4 chips.

For the readout of all those chips, several tasks need to be performed. One has to combine the data from different chips in one datastream, sort the data in epochs, eventually perform simple compression algorithms on the data, and finally send them over a communication interface to the DAQ-Cluster. A further challenge is to synchronize the so gathered data with the data from other detectors.

The ROC also needs to provide a control interface to the GET4 chips and to the ROC itself. Commands can be send over the communication interface to the ROC. For certain tasks it is useful or even necessary to execute multiple commands in a very short time frame. For this purpose short command lists can be send together in one packet to the ROC. For longer command lists and lists that need to be executed more often the ROC provides a programmable list of commands stored on the FPGA.

This presentation gives an overview of the design of the ROC’s GET4-readout module and present some data that has been taken in a test setup.