ACTL-TIME: Report on recent activities. Arnim Balzer for the ACTL-TIME sub-work package ACTL-TIME Camera Call, SeeVogh July 1, 2016

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1 ACTL-TIME: Report on recent activities Arnim Balzer for the ACTL-TIME sub-work package ACTL-TIME Camera Call, SeeVogh July 1, 2016

2 Reminder: Mailing Lists Created two temporary mailing lists until official CTA mailing lists are available Please let me know if your address has changed until the official mailing lists are created No automatic synchronisation with CTA user database Arnim Balzer - ACTL-TIME Activities - 2

3 UCTS developments in APC See Kashiwa for previous news ACTL-TIME Camera Group Activities (pres. A. Balzer, slides 2-10 for APC activities) UCTS based on SPEC card (reminder) Sending time stamps in packets of 20 (bunches) at 200 khz with zero event loss (rate at Mbps) No loss, even with ~factor 10 above CTA maximum rates This even with the triggers being at 100kHz with an echo of each trigger 200 ns later (so the 200kHz total) No loss, even with a short spacing between (though the SPI event-type will not have time to pass) Even while the White Rabbit Switch also has two other SPECs connected, with events at 30kHz using previous code, so loading the switch by 14.88Mbps each No loss, even with the switch occupied at 6% of its 1 Gbps (i.e., more than with 13 LSTs running at 30kHz attached) IP automatic address search (by bootp) Arnim Balzer - ACTL-TIME Activities - 3

4 UCTS developments in APC New: Bunch Sending of packets of 20 time-stamps as above 16 bytes per event Bunch tailer, including Bunch#,+ MSBs of PPS, Event# 12bytes per bunch tailer 8, 20, 14 bytes for UDP, IP, Ethernet headers -> 32bytes overhead average of 18.7 bytes per event, including overhead, on the lower-throughput 1 Gbsp WR fibre Time-out of 1 ms since 1st event in bunch, to send bunch if not filled Sending by UDP to CDTS-Server (/Library) which receives and translates to the CDTS message format (including re-integrating MSBs) In progress Proto CDTS-Server for use in NectarCam testbench (Saclay), developed in CPPM while awaiting GRAPPA final version Will be tested at APC, adapted for above format, then sent to Saclay (August) Arnim Balzer - ACTL-TIME Activities - 4

5 News from TiCkS TiCkS card «Timing and Clock Stamping» Redesign of SPEC board to fit in CTA Form Factor (60x164x27 mm) Keeping FMC for now, with RJ45 connectors on FMC-DIO as before Allows flexibility for other uses than CTA Easy redesign to remove FMC and place RJ45s on main board Delays due to SPARTAN-6 lead-time, company holidays, admin problems for sending / receiving, etc. etc but just 1.5 months later than planned for debugged version. Proto TiCkS received in June, now debugged and working! Cost ~1k for first edition series cost will be much less Arnim Balzer - ACTL-TIME Activities - 5

6 News from TiCkS Next, 2 new versions with bugs (connectors, Flash) corrected: 1 version with FMC connector put WR Open Hardware and Open Firmware 1 version with integrated CTA connectors (2xRJ45) still Open Hardware and Open Firmware Integration of more precise Firmware TDC from DTPI-Orsay being tested (R. Sellem / D. Hurteau developed «under contract») though ~300 not required for CTA (would be firmware for CTA use only) We can provide our APC/IRFU SPEC card FPGA software for any tests needed by other cameras Offer to test with SPEC or with TiCkS card is open to other cameras (some delays replying due to work described above) Arnim Balzer - ACTL-TIME Activities - 6

7 FlashCam UCTS Tests Tests with GRAPPA UCTS board and FlashCam beginning of June or: Benchmarking the GRAPPA UCTS using FlashCam ;-) Successfully tested hardware interface FlashCam can use UCTS PPS and clock signal 38 ps RMS of clock on FlashCam frontends Setup => free-running WR Switch -> UCTS -> RJ45 LEMO Converter -> FlashCam Master Board FlashCam can be externally triggered via UCTS UCTS can timestamp FlashCam readout trigger signals TDC of UCTS unfortunately still had some problems Introduced large jitter of several ns Jitter problem is no fixed, but still bug during readout of timestamps Arnim Balzer - ACTL-TIME Activities - 7

8 FlashCam UCTS Tests UCTS TDC readout was broken, e.g. very large jitter UCTS input trigger signal was too short (< 4ns), had to be stretched so cut off at small deltats expected Arnim Balzer - ACTL-TIME Activities - 8

9 GRAPPA UCTS TDC Tests 125 ps granularity of TDC implementation 125 MHz TDC clock plus 64 TDC bins Checked jitter between two UCTS: Connected via two 5km fibres two WR Switch in GrandMaster mode Uncalibrated setup, e.g. no White Rabbit Calibration applied Free-running 500 Hz pulse generator as input signal Arnim Balzer - ACTL-TIME Activities - 9

10 CDTS Network Bridge Draft Received no comments so far Deadline was this call Okay for everyone? Failure/Overload of one intermediate switch can t propagate to other intermediate switches Arnim Balzer - ACTL-TIME Activities - 10

11 CDTS Trigger Message Content Draft Received comments from NectarCam Deadline was this call Okay for everyone else? Won t collect various trigger types Not our problem Arnim Balzer - ACTL-TIME Activities - 11

12 UCTS Counter Reset Issue: No LVDS signal directly foreseen for reset Two options: Pure software version PPS counters might be off by 1 Use external trigger signal in last step Guaranteed that all counters are in sync See circulated document for details Please give feedback until the next call Arnim Balzer - ACTL-TIME Activities - 12