1. Slink TX Slink merger Teststand setup Slink merger firmware and testing Firmware features - DAQ RAMs for saving out input and output data - Possible to disable any one of the Slink inputs - New Slink format (more information on Sakari’s slides) Test software features - Testing parameters are easy and fast to change by using steering file - Disabling of Slink inputs - Constant or variable data size - Random data pattern or ramp pattern - Selectable test pattern update interval (to get higher readout rate) - Creates and loads test patterns to transmitters (according to parameters) - Predicts input and output data, and compares the data to data in DAQ RAMs - Slink merger output can be confirmed by using 2 nd Slink merger to receive it Test results - 50M events OK @ 1.1kHz L1A rate Myron mode Variable event size (4-80 words) Two inputs disabled Pattern updated every 10 th event - 500k events OK Disabled inputs one by one - 2M events OK @ 1,6kHz L1A rate All inputs enabled -1M events OK Big event size (110 words) Steering file

2. Slink format Merger header 2 Merger trailer Input 1 header 1 Input 1 trailer Input 2 header 1 Input 2 trailer Input 3 header 1 Input 3 trailer Input 4 header 1 Input 4 trailer Slink input 1 data Slink input 2 data Slink input 3 data Slink input 4 data Format version Data source Region ID Reserved Bunch count Buffer # 842828 Data LatencyData size 16 Data sizeError flags 16 - Bunch counter value in the first header - Second header word - Data size in the second header word - Space for latency (not implemented yet) Input 1 header 2 End of fragment Input 2 header 2 Slink merger output End of fragment Input 3 header 2 End of fragment Input 4 header 2 End of fragment 0xE0F00000 Merger header 1

3. Reces merger header 1 Reces merger trailer Reces 1 header 1 Reces 1 trailer Reces 2 header 1 Reces 2 trailer Reces 3 header 1 Reces 3 trailer Reces 4 header 1 Reces 4 trailer Reces Pulsar 1 data Reces Pulsar 2 data Reces Pulsar 3 data Reces Pulsar 4 data Reces 1 header 2 End of fragment Reces 2 header 2 Reces merger output End of fragment Reces 3 header 2 End of fragment Reces 4 header 2 End of fragment Reces merger Merger header 2 Merger trailer Input 1 header 1 Input 1 trailer Input 2 header 1 Input 2 trailer Input 3 header 1 Input 3 trailer Input 4 header 1 Input 4 trailer Slink input 1 data Slink input 2 data Slink input 3 data Slink input 4 data Input 1 header 2 End of fragment Input 2 header 2 Slink merger output End of fragment Input 3 header 2 End of fragment Input 4 header 2 End of fragment Reces merger header 1 Merger header 1 Reces 1 Reces 2 Reces 3 Reces 4 Reces merger Slink merger