21 January 2003Paul Dauncey - UK Electronics1 UK Electronics Status and Issues Paul Dauncey Imperial College London

21 January 2003Paul Dauncey - UK Electronics2 UK electronics project (finally!) approved in Dec 2002 Full equipment request, but only for ECAL electronics Full manpower request for engineering effort from Rutherford Laboratory (RAL) New engineer (Adam Baird, RAL) has now joined the project RAL will also do layout and some testing Budgeted to use all money and effort by the end of Mar 2004 RAL people have experience of CMS tracker Significant knowledge of design of Front End Driver (FED) Readout board for CMS silicon tracker Architecture close to proposed CALICE board Will now use FED as a starting point for CALICE UK approval

21 January 2003Paul Dauncey - UK Electronics3 0V CMS Tracker FED Front End FPGA 12x Opto Rx PD Array 4x Prog Delay 1 Synch & Processing TTCrx VME QDR SSRAM 2 5V3.3V1.5V Dual ADC 3.3V Dual ADC 1 6 0V Front End FPGA 12x Opto Rx PD Array Synch & Processing 8 Dual ADC Dual ADC Readout & Synch Control ASIC FPGA Temp Sense Temp Sense 4x Prog Delay FPGA 1 3 4x Prog Delay FPGA 4x Prog Delay FPGA Temp Sense 3.3V 1.5V 5V -5V spare PD Boundary Scan System ACE E-Fuse Hot swap DC-DC Back End FPGA Temp Sense 12x trim dac Buffer Jumper Matrix Compact Flash VME64x Interface FPGA Test Connector SW Hot swap cycle Live extract request Config E2PRO M Vref DAQ TTS Spare 1.5V 3.3 V 5.0 V 2.5V -5.0V 2.5V Vref 1.5V Run/Halt VME Power Good LEDs extract Id E2 Prom FLT LEDs FSYNC Readout +12V LEDs +5V +3.3V FE 1 FE 8 EMU LEDs Process Transfer +2.5V LEDs +1.5V -5.0V halted LEDs Busy error TTC Over temp LEDs VME Clock Control Data Clock Control Data 8 3.3V1.5V

21 January 2003Paul Dauncey - UK Electronics4 Ideally, keep everything to the right, redo everything to the left Restricts readout board to same I/O and inter- FPGA paths as FED No major problems seen so far FED layout

21 January 2003Paul Dauncey - UK Electronics5 FED more complicated and hence expensive than previous design Keep cost within budget by increasing number of cables per board Previous design had 6 cables (= 6 VFE-PCBs) per board, new design has 16 Total number of boards for the ECAL drops from 15 to 6 Cost per board should be around £6k ~ 10k  Save on much of layout and some firmware design VME FPGA should be very close (if not identical); would like VME interrupts but not (yet) implemented Back end (BE) FPGA can reuse major parts of FED firmware Front end (FE) FPGA will need all new firmware BE FPGA much larger than needed Use spare logic for trigger handling; no need for separate board Trigger I/O and distribution via J0/J2 backplane unused pins Requires adding termination resistors for incoming LVDS, i.e. changing layout of back of board Implications of using FED

21 January 2003Paul Dauncey - UK Electronics6 Space for cable connectors, line drivers/receivers, ADCs, etc. restricted by position of FE FPGA Need to minimise the number of components here BE has 2  1MByte memories for event buffering With 16 cables, board event size = 16  6  18  2 = 3.5kBytes/event 2MBytes stores only around 500 events in each beam burst May need larger memories for CALICE; i.e. would require changing layout of back of board 9U front panel so can fit 16 high-density 68-pin SCSI connectors 38 pins needed; leaves 30 pins = 15 differential lines spare Connected directly to FE FPGA for use as LVDS Could use as I/O lines for digital HCAL readout For more details, see Implications of using FED (cont)

21 January 2003Paul Dauncey - UK Electronics7 ECAL assumed electronics schedule JFMAMJJASONDJFMAMJ Prototype 2 boards Design Layout Fabrication and assembly Testing, including VFE prototype tests Production 9 boards Redesign Layout Fabrication and assembly Testing

21 January 2003Paul Dauncey - UK Electronics8 ECAL prototype test schedule When and where will prototype tests be done? ECAL final system schedule When and where is full readout electronics system needed? What sets this date and how firm is it? Will first use be beam, cosmics, calibration tests…? HCAL schedule When will analogue and digital options be ready? Will either or both options use UK readout? Is a prototype test needed for the analogue? When and where will prototype test be done for digital? Issues – CALICE schedule and plans

21 January 2003Paul Dauncey - UK Electronics9 Voltage levels still have some uncertainties Main problem would be negatively-shifted LVDS Needed for schematics – before end February Confirm connector choice Compatibility with cable and connector needed at VFE-PCB Needed for schematics – before end February Pin allocations within connector In principle, needed for schematics – before end February If desperate, could wire cables to swap pins later – before end May Cable specification Some cables required for VFE-PCB tests Need to be manufactured – before end May Prototype board testing with “semi-final” VFE-PCB Needed before redesign – before end November Issues – VFE-PCB interface

21 January 2003Paul Dauncey - UK Electronics10 Laboratory requirements; cable safety specification, etc. Needed for cable manufacture – before end May Define number of events needed per beam spill Affects size of onboard memory required Also needs event size estimate per board from HCAL if using UK boards Needed for schematics – before end February Cable lengths Distance between VME crate and ECAL/HCAL Needed for cable manufacture – before end May Trigger logic and distribution Allocation of I/O lines with termination resistors Needed for assembly– before end May Number of pins to be allocated on backplane for trigger fanout Needed for firmware design – before end May Issues – beam test details

21 January 2003Paul Dauncey - UK Electronics11 Analogue; is VFE-PCB interface compatible? For signal levels, cables, connectors Needed for schematics – before end February Number of boards required for manufacture – before end February 2004 Digital; interface specification Sufficient number of spare connector pins? Needed for schematics – before end February Digital; allocations of pins Have to mount termination resistors on correct lines Needed for assembly – before end April Digital; firmware development for spare pins UK unlikely to have manpower required Needed for digital HCAL tests – before end November Issues – HCAL plans