Discussion Items Clock PC and/or VME CPU Trigger readout Clock distribution Local clock PC and/or VME CPU Trigger readout ECL Belle2link
Clock [1] Who needs what clock? COPPER system: 42.3MHz KEK has customized crystals. RocketIO (high speed link): 127MHz / 125MHz 127MHz crystal is not commercially available, which is needed if one tries to get that from local oscillator. Someone can distribute customized crystals. 5000 JPY/crystal. Switching off clocks / switching clock freq. to others. Onboard-implemented oscillator or pluggable clock card? FINESSE SCK & RCK (differential pairs).
Clock [2] Who (related to TRG) needs what clock? GDL & CDC: MN and YI will discuss. ECL: through collector board(s). FAM on the detector through collector board 6x TMM in the EH through GDL (single-ended LEMO?). TOP: through RCK or else. 9 boards need clock. KLM: same as TOP for convenience.
Clock [3] Who (related to TRG) needs what clock? All trigger sub-modules will use the clock from the single origin (or use a local oscillator during maintenance). Clock monitoring 2x pins should be implemented on the electronics board.
PC and/or VME CPU [1] # of PCs and/or VME CPUs TTD: 10 CPUs. GDL+CDC-TRG: 5 CPUs. ECL: O(1) PCs to control 52 FAMs + >= 1 PC for firmware downloading. E-KLM: 6 PCs + 9 VME crates. CDC: >= 1 PC HV/LV control: >= 1 PC per detector Isolated network from “fbdaq”. CPUs are booted up from limited # of places.
PC and/or VME CPU [2] Slow control Another isolated network from the one in the previous page.
Trigger Readout [1] TRG will be readout by B2Link? Yes. Any possibility to recycle AMT-3 FINESSE? No. Summary needed Homework to YI by the next B2GM.
Trigger Readout [2] CDC TRG / ECL TRG raw data TOP TRG raw data Readout by local monitoring system. Need not taken care by the CDAQ. TOP TRG raw data Readout by COPPERs.
Homework to MN Level-1 latency