1. HOLA and FTK_IM tests in SR1

2. Duo-HOLA in Pixel & SCT RODs New HOLA works as a drop-in replacement for the original HOLA in both Pixel and SCT RODs It took us a couple of days to get their software infrastructure working in SR1 ◦ A lot of problems running partitions ◦ Solved with help from the experts Small issue with dimensions: ◦ HOLA front mounting panel has a hole through which the optical transceiver sticks out ◦ But our HOLA has two such transceivers! 2

3. Single-output HOLA panel in a ROD-BOC motherboard 3 The mounting panel provides enough space for only one transceiver

4. Duo-HOLA was installed without a mounting panel → YIKES! 4 With slight pressure, our HOLA touches the grounded rim of ROD-BOC card. As a result, strong current burns a protective resistor on the ROD-BOC.

5. HOLA + FTK_IM setup 5 Duo-HOLA ROD ROBIN I ROBIN 2 ROS (PC) DAQ link EDRO board FTK_IM FTK link FTK_IM replicates the data it receives from HOLA and sends it to a 2 nd ROBIN. A PC reads out and validates data from both ROBINs. We control the speed of each readout to selectively exercise XOFF Attenuator XOFF (DAQ) XOFF (FTK) Pattern generator XOFF

6. XOFF from FTK Pixel: FTK can hold the data (XOFF) for an arbitrarily long period of time. ◦ This is just a feature of their SR1 testbench ◦ Once XOFF removed, data flow continues SCT: at ~100 Hz even rate (maximum for their SR1 testbench), FTK can hold data for up to 10 seconds ◦ Beyond that, ROS times out, and the corresponding ROD is completely taken out of data taking. ◦ Need to be careful! 6

7. Fear of spurious XOFFs During FTK commissioning, FTK fiber may be plugged/unplugged at will Random noise on the FTK fiber may induce spurious XOFFs on HOLA side XOFF status is sampled at 100 MHz ◦ Significant probability to get it randomly At 100 KHz event rate, spurious XOFFs may introduce enough downtime to take down the ROD (see previous slide) 7

8. Possible solutions 1. Initially, load a version of HOLA firmware without FTK XOFF ◦ Replace firmware later (eg, technical stop) 2. Replace one HOLA LED with a jumper that enables/disables FTK XOFF 3. Have a programmable register in HOLA that enables/disables FTK XOFF ◦ HOLA starts up without FTK XOFF ◦ At any time, FTK XOFF can be enabled by sending a special set of programming signals through S-LINK return lines from FTK_IM ◦ Already implemented and tested We like solution #3. But should we also add a jumper (#2) – just to be on a safe side? 8

9. Thanks Big thanks to Pixel and SCT experts (too many to list here) Jinlong organized everything and provided invaluable help along the way Alberto, Francesco, Marco, Andrea 9