ATLAS Level 1 Calorimeter Trigger

(KIP, University of Heidelberg)



Note: the G-LINK will be replaced by LVDS links

The Read Out Driver Module of the Level 1 Calorimeter Trigger is the interface between the front-end system and the level-2 buffers (ROB). It collects data from level-1 accepted events over a pipeline bus and sends them via an S-LINK interface to a Read Out Buffer.

The pipeline bus was designed to match all important aspects of the S-LINK hardware. Both interfaces employ a FIFO concept with a 32-bit bus. They are clocked with the same clock frequency of 33 MHz or 66 MHz.

The data is already received on the ROD in a sequential order. The ROD adds an event header and trailer to the data set and stores it in a FIFO memory until it can be transmitted with the S-LINK to the level-2 buffer.

In total eight to sixteen S-LINKs will be needed.


14 March 1998 Schematics of the Trigger ROD module will be ready by April and will be sent to CERN for a mini design review
13 August 1998 Master node module PCB being designed. S-LINK adapter board will be designed later
30 November 1998 Erik van der Bij reviewed PCB layout and schematics of the Master node module
November 1999 Master node module working and presented at LEB99
17 March 2000 Ordered one parallel electrical link
31 May 2000 On 14 June a design review will be held of the PPrASIC



CERN - High Speed Interconnect - S-LINK
Erik van der Bij - 7 August 2001