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SVT Trigger Database Related Issues Xin Wu

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possible two different pattern recognition algorithms for low and high ... Hit Finders: PEDRAM, CRAM. 12 Hit Buffers : ... CRAM: look-up table for cluster ... – PowerPoint PPT presentation

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Title: SVT Trigger Database Related Issues Xin Wu


1
SVT Trigger Database Related IssuesXin Wu
  • SVT provides a list of tracks to the L2
    processors
  • normally no user selectable parameters/cuts
  • possible two different pattern recognition
    algorithms for low and high L1 rate triggers
  • but algorithm related parameters need to be
    loaded
  • most of the parameters are stable
  • Database requirements
  • FPGA programs small and stable ( MBytes)
  • on board storage Flash RAM, EPROM
  • off board storage hardware database?
  • version number of program in use trigger
    database?
  • Algorithm related hardware memories, parameters
    ? next pages

2
Algorithm Related Hardware Memories and
Parameters
  • Affect trigger performance (efficiency and fake
    rate)
  • some need to be modified when beam conditions
    change
  • no experience yet, to be seen!
  • should be accessible also by offline (Trigsim)
  • Therefore belong to the Trigger Database (actual
    files or pointers)
  • Hardware memories on SVT boards
  • 36 Hit Finders PEDRAM, CRAM
  • 12 Hit Buffers SSMAP, AMMAP
  • 12 AM Sequencers (12) SSMAP, ?Seq_RAM
  • 24 AM Boards AM_patterns
  • 12 Track Fitters SS_MAP, MAKE_ADDR, P0RAM,
    COERAM, CHI2_RAM

3
Hit Finder Hardware Memories and Parameters
  • PED_RAM pedestals and thresholds
  • ALTERA chip internal SRAM
  • channel pedestal 7-bit, 1K?10 streams/board ?
    360 KB total
  • chip threshold and cluster charge cut 3Byte/chip
    ? 8.4 KB total
  • max of clusters 1 Byte/stream ? 360 Bytes
    total
  • of chips 1 Byte/stream ? 360 Bytes total
  • CRAM look-up table for cluster finding
  • Static RAM
  • 6 bits, 32K ?10 streams, same for all boards ?
    320 KB total
  • Stream number to barrel/layer map
  • ALTERA chip internal SRAM
  • 6 bits, 10 Byte/board ? 360 Bytes total

4
HB/AMS/AMB Hardware Memories and Parameters
  • SSMAP (hb) hit to super-strip look-up table
  • DRAM
  • 15-bit, 128K/board ? 3 MB total
  • AMMAP (hb) road to Super-Strip list look-up
    table
  • DRAM
  • 16-bit, 1 M/board ? 24 MB total
  • SSMAP (ams) same as SSMAP of hb
  • ?Seq_RAM (ams) microsequencer RAM
  • DRAM
  • 24-bit, 128k/board, same for all boards ? 512 KB
    total
  • maxRoad and empty layer register (ams)
  • 12-bit register ? 2 B total
  • AM_patterns (amb) AM patterns
  • AM chips 128 chips/board, 128 patterns/chip
  • 12-bit, 6 /pattern ? 192 KB/board ? 4.5 MB total

5
Track Fitter Hardware Memories and Parameters
  • SS_MAP edge positions of super-strips in a road
  • DRAM
  • 24-bit, 32K/board ? 1.125 MB total
  • MAKE_ADDR map to appropriate fitting parameters
  • DRAM
  • 13-bit, 16K/board ? 384 KB total
  • P0RAM(intercept memory) track parameters at the
    edge position
  • Flash Ram
  • 14-bit, 6M/board ? 144 MB total
  • COERAM (coefficient memory) coefficients of
    multiplication
  • ALTERA chip internal SRAM
  • 67-bit, 900/board ? 95 KB total
  • CHI2_RAM (?2 memory) look-up table to calculate
    the square of ?
  • ALTERA chip internal SRAM
  • 10-bit, 64/board, same for all boards ? 128 Bytes
    total

6
Track Fitter Hardware Memories and Parameters
(Cont.)
  • Shift control registers control shifting
    distance after multiplications
  • 15-bit, 6/board, same for all boards ? 12 Bytes
    total
  • ? cuts registers cut on fitted ?1, ?2, ?3
  • 17-bit, 1/board, same for all boards ? 3 Byte
    total

7
Summary
  • Need large disk space to store hardware memory
    files
  • P0RAM (144 MB), AMMAP(24MB), AM_pattern(4.5MB),
    SSMAP(3MB) ? 200MB
  • No frequent change necessary, if beam stable!
  • but version numbers should be recorded for each
    run for offline use
  • Amount of down loading at run start-up is less
  • Hit Finder and Track Fitter have Flash RAMs and
    Static RAMs
  • need to down load
  • AMMAP(24MB), AM_pattern(4.5MB), SSMAP(3MB), ... ?
    40MB
  • The details of the SVT database related issues
    will be discussed at a workshop in Pisa next week
    ? WE WILL BE BACK!
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