10/12/2004 T0/V0 meetingP. Antonioli / INFN-Bologna TOF readout Reminder of TOF readout scheme and TOF readout modules Overview of specifications with an emphasis on requirements for groups who want to use TOF electronis

10/12/2004 T0/V0 meetingP. Antonioli / INFN-Bologna TOF readout reminder 18 TOF supermodules Crates with HPTDC Front-End cards with ASIC (NINO) 8 m Rad-tolerance issues for electronics inside crates

10/12/2004 T0/V0 meetingP. Antonioli / INFN-Bologna TOF readout reminder (2) 6U depth x 9U height

10/12/2004 T0/V0 meetingP. Antonioli / INFN-Bologna TRM reminder VME bus HPTDC Output Fifo Readout Controller VME Interface Event Manager SRAM 32 TRG 32 x 15 L2r L2a L1 INPUTS (LVDS) 684 Tdc Readout Module inside crates Tested all components during 2004 irradiation campaigns SRAM HPTDC LUT EVENT BUFFERS FLASH CC FIRMWARE HPTDC LUT Functionalities implemented by an FPGA BOOT SEL WATCHDOG

10/12/2004 T0/V0 meetingP. Antonioli / INFN-Bologna Final TRM layout To allow maintenance, easy mounting operation and matching with front end, HPTDC mounted on 24 ch piggy back

10/12/2004 T0/V0 meetingP. Antonioli / INFN-Bologna Final TRM layout (2) 5 piggyback cards per side, 1 central PCB for FPGAs and memories, central aluminium bar for heat dissipation 6U MB prototype housing 2 PB

10/12/2004 T0/V0 meetingP. Antonioli / INFN-Bologna Radiation levels reminder Radiation levels expected at ALICE/TOF: 1.2 Gy/10 years (TID) Total neutron fluence (>20 MeV): /cm 2 /10 years. Total charged hadrons (>20 MeV): /cm 2 /10 years. 89 Hz/cm 2 expected in PbPb MB events (hadrons+neutrons > 20 MeV). For ALICE/TOF careful design needed to handle SEU, Degradation for TID effects neglectable. Latchup protections needed. Some specifications modified in 2004 due to the need to implement radiation tolerant electronics.

10/12/2004 T0/V0 meetingP. Antonioli / INFN-Bologna DRM reminder Tasks: 1.Read data on VME backplane (from TRM) 2.Send data to central Alice DAQ through DDL 3.Provide interface with trigger (TTC) 4.Provide Slow Control function/access to VME 5.Actel reprogramming Work done during 2004: Developed and tested DDL interface Developed and tested TTC interface Radiation test to check various slow control solutions On-going definition of crate/TRM specifications following tender won by CAEN and impacting on DRM specs.

10/12/2004 T0/V0 meetingP. Antonioli / INFN-Bologna Final DRM scheme VME bus Readout VME interface FPGA: Actel ProAsic+ Slow control access FPGA: Actel ProAsic+ SRAM EVENT BUFFERS FLASH CC FIRMWARE BOOT SEL WATCHDOG TTCrx DDL SIU Optical link to PC (PCI bus) VME ACCESS ARM (Actel reprogramming) Eth0/ Slow Control backup

10/12/2004 T0/V0 meetingP. Antonioli / INFN-Bologna How we arrived here... DDL integration tested with DRM prototype card (Dec ’03/Jan ’04) TTC integration tested (July ’04) with DRM prototype card + TTCvi/TTCex + LTU (Sep/Oct ’04) Tests done for TRM emphasized rad-tol problems with Altera FPGAs. Need to move FPGA TRM (now Actel) reprogramming to DRM (this makes DRM/TRM specifications much more interconnected) PowerPC from Artesyn as slow control solution successfully tested in magnetic field (Dec ’03), but not encouraging test in radiation (PSI/May ’04). Looked for a different solution. Optical link tested in radiation. The use of new DDL-D-RORC cards (with two optical links each) allows to avoid master/slave scheme between the two crates, simplifying our design (decision taken March ’04, without any impact on foreseen costs) and making readout much more robust (every crate is “independent”). NOT RELEVANT FOR T0

10/12/2004 T0/V0 meetingP. Antonioli / INFN-Bologna Rad tests and FPGA... PSI May & June ’04: Altera Stratix, Flash, RAM,  C, low- drop, current limited p-switch, PowerPC LNL July ’04: HPTDC with heavy ions CRC/Louvain Nov ’04: optical link and ARM processor Assessed SEU rates for almost all components (not discussed here, see LECC2004 paper). Stratix for TRM is not a viable option. Moved to reprogrammable Flash based FPGA (Actel ProAsic Plus) [rad tests in ALICE and LHCb ok) BUT: Additional logic needed to support Actel reprogramming

10/12/2004 T0/V0 meetingP. Antonioli / INFN-Bologna Actel reprogramming Due to the technology inherently more robust (Flash vs RAM) configuration upset absent. Need of special voltages during reprogramming: +16.2, V Configuration is not simply a matter of handlong a download through a passive serial Flash, but the firmware code needs to be interpreted while downloading (RAM also needed for staging) We added 2 power supply (x crate) providing and V (we will use +/- 12 V pins). We wil use one external (to the TRM)  C and use JTAG on the backplane (MTM bus on VME64X)

10/12/2004 T0/V0 meetingP. Antonioli / INFN-Bologna Actel reprogramming (2) High integration needed Prescriptive steps to start reprogramming (power up / addressing / etc) Crate VME... Now not so standard!

10/12/2004 T0/V0 meetingP. Antonioli / INFN-Bologna Move slow control outside The “big” change is related to the choice of the slow control/configuration solution: we move outside the “intelligent” part (18 PC in control room, each connected to 4 crates). Optical PCI-VME adapters commercially available. Make it rad-tolerant implementing FPGA with Actel + use serializer/deserializer tested in radiation [successfully tested at Louvain in Nov. ’04] V2718 from CAEN

10/12/2004 T0/V0 meetingP. Antonioli / INFN-Bologna VME mastering Test carried out jointly with CAEN Modified firmware of their VME Master (V1718/V2818/A2818). FPGA initiating VME cycles when in DAQ mode (end Oct ’04) HPTDC Trigger DS DTACK CDM prototype 250 ns!

10/12/2004 T0/V0 meetingP. Antonioli / INFN-Bologna CPDM Clock and pulser distribution module - Hosted only in one crate every two - “simple” but “delicate” card - No VME interface required, latch-up protections as for TRM/DRM/LTM - tests carried out to check clock jitter of present clock distribution scheme defined clock cable and connectors - the pulser section of this card is not relevant for T0

10/12/2004 T0/V0 meetingP. Antonioli / INFN-Bologna Clock Distribution tests -Over 16 channels tested in optical fan-out jitter always well below 15 ps - Opt.rec/LVDS adaptation ok.

10/12/2004 T0/V0 meetingP. Antonioli / INFN-Bologna Clock jitter and distribuition Defined high quality clock cable and connectors for distribution from CPDM to TRM/DRM/LTM, Tripolar connectors (including shield) from Tyco (CPDM) and Fischer -Over 16 channels tested in optical fan-out jitter always well below 15 ps - Opt.rec/LVDS adaptation ok. Tyco: CPDM side Fischer: TRM side

10/12/2004 T0/V0 meetingP. Antonioli / INFN-Bologna P2 bus Through P2 main synch and trigger signals distributed to TRMs. All signals LVTTL (the most time critical ones “LVTTL differential”) DRDY and BUSY for readout. ON/FAULT signals for control.

10/12/2004 T0/V0 meetingP. Antonioli / INFN-Bologna Guidelines for TRM users Questions: - 48 channels leading edge only - 96 channels after your charge to time converter - correct? - others? About demultiplexing story: Working in VHRM, leading edge only, 4 channels/HPTDC maximum bandwidth: 5 MHz (which is different from dead- time and different from buffer occupancy). T0 needs 156 ch, but with only 4 ch/HPTDC, so T0 needs two TRMs

10/12/2004 T0/V0 meetingP. Antonioli / INFN-Bologna Input signals must be LVDS We use VHDCI connectors, with custom pin-out, 24 pairs per cable. We use Amphenol Skewclear cables. Tested up to 7 m, using NINO as LVDS driver. Please check carefully cable length and your LVDS driver. You will need at least 156/12=13 cables (you will use one signal every 2) Guidelines for TRM (2)

10/12/2004 T0/V0 meetingP. Antonioli / INFN-Bologna Guidelines for TRM (3) Data are matched on L1 and moved in memory buffers, waiting for L2a. TRM memory size (512 kB) designed for Pb/Pb TOF occupancy and 240 channels/TRM. Please check if it is ok for your need. In principle T0 doesn’t need CPDM but you need to provide to the 2 TRMs and 1 DRM, high quality LHC clock in LVDS standard, using the Fischer tripolar connector. Our suggestion: use our CPDM. You need to bring to the CPDM LHC clock with unimodal fibre (could be interesting to send it from the same optical fan-out used for TOF crates).

10/12/2004 T0/V0 meetingP. Antonioli / INFN-Bologna Guidelines for crates Please consider the following (just to use the crate as it is): - such a system needs water (but we should test if it is really necessary: just 4 cards over 12, and you can put fans around); - you need also a PC with optical link to handle the SCL - through a branch controller we power (48 V) and control LV (and ON/FAULT pins) of each card (could be managed by TOF directly but we must check cables, etc.). Communication through an OPC server (or may be TCP-IP/DIM interface to PVSS). To be checked if you can simply connect to our LV system T0 crate: DRM CPDM TRM

10/12/2004 T0/V0 meetingP. Antonioli / INFN-Bologna Guidelines for crates (2) If T0 wants to add other cards to the crate: - Do not put other VME masters inside, don’t use BR lines - Note voltages: 3.3 V only (even on 5 V pins) and +16.2/-13,5 V (normally not available) on +12/-12V pins - You need to use cardlok. No “guides” Don’t interfere with P2 bus (rows A-C strictly defined) and implement ON/FAULT signals - Please note distance of P1 from bottom is not standard + 6Ux9U format (not P3, P1 in the middle) + VME64X connectors

10/12/2004 T0/V0 meetingP. Antonioli / INFN-Bologna Conclusions Working out the TOF readout project, precise specifications now have been elaborated. Unfortunately (essentially for radiation tolerance and magnetic field issues) crates are not so standard as we originally hoped. T0 is welcome to use our readout electronics, but please be aware of specifications to be followed and the need for deployement near T0 electronics. Please be in touch with us, especially consider we don’t have spares for T0 and specific orders must be put in place (funding to be defined)!

10/12/2004 T0/V0 meetingP. Antonioli / INFN-Bologna DDL integration reminder (results already presented at CR4/March 2004) DRM prototype with DDL SIU Bandwidth of MB/s with fixed packet size of 2 – 5 kB DATE Version 4.7, Readout Version 4.6 Event rate up to 330 Hz No errors over 60 M events

10/12/2004 T0/V0 meetingP. Antonioli / INFN-Bologna TTC integration reminder TTCrm mounted on DRM prototype Trigger distribution to HPTDC cards TTCviTTCex HPTDC cards Tested decoding of L1/L2 messages Tested LTU (received at October) No problem foreseen