08/13/98: HjC, EJ - Original proposal

08/14/98: JMN - Added header information

10/09/98: EGJ - Changed names of raw data blocks headers slightly and added

count of Npre and Npost raw data blocks 02/01/99: EGJ - Moved 2x2 bytes of Npre/Npost information into event descriptor so event descriptor length is modulo 8 bytes (useful for SCI) Defined some of internal structure of Trigger Summary Moved DSM data from TCU crate out of Raw Data block into Trigger Summary

09/28/99: HjC,ZM, JMN - removed byte limits rearranged byte counts and headers

12/06/99: ZM - cleaned up structures and moved ZDC data

12/21/99: zm - fixed length of raw data buffer, trg summary; made into html document.

1/13/00: zm - corrected to agree with trgStructures.h.

• The first 4 bytes are for "native trigger format" - NOTE - these 4 Bytes are not passed to DAQ!
  • 2 bytes total trigger event byte count
    
  • 2 bytes filler (now = 0)
    

  ---

  The following data is passed to DAQ:

  ---

• 28 byte Event Descriptor Constructed in level 1 and containing all TCU readout

  ---

  • 2 bytes byte-count Length of Event Descriptor including this header (28 B)
    
  • 1 bytes header "E" in ASCII for Event Descriptor
    
  • 1 byte version number allows up to 256 separate formats for trigger events nibble 1 is major version, nibble 2 is minor version number thus this version is 00010001 binary or ox11
    
  • 4 bytes data MS 32 bits of 64-bit Bunch Crossing Number
    
  • 4 bytes data LS 32 bits of 64-bit Bunch Crossing Number
    
  • 2 bytes data Token
    
  • 2 bytes data Action Word:
    
    
    • 4 bits TRG Cmd
      
    • 4 bits DAQ Cmd
      
    • 8 bits Detector Bitmask
      this bit packing is compiler specific
    
    
  • 2 bytes data Output from last DSM board, saved on TCU
    
  • 2 bytes data Address of raw data for this crossing in DSM buffers
    
  • 1 byte data Busy bits at start of this Bunch Crossing
    
  • 1 byte data Flag bits: bit 0 = Pileup flag, bit 1 = Priority, bit 7 = Fake Data
    
  • 2 bytes data Trigger Word
    
  • 2 bytes data Number of pre-History raw data blocks - Npre
    
  • 2 bytes data Number of post-History raw data blocks - Npost

• Trigger Summary Level 1 and level 2 results are here, along wih the data from the DSMs in the TCU crate

  ---

  • 2 bytes byte-count Length of Trigger Summary, including this header (432 B)
    
  • 2 bytes header "TS" in ASCII for Trigger Summary
    
  • 8 bytes L1 Summary descriptor
    
  • 8 bytes L2 summary descriptor
    
  • 2 bytes byte-count byte count for DSMs read out for L1 (l = 144 bytes)
    
  • 2 bytes header "L0" in ASCII
    
  • l bytes data Data from DSMs in TCU crate
    
    • 32 - 2B words of coarse pixel array
      
    • 8 - 2B words of CTB+MWC DSM
      
    • 8 - 2B words last DSM
      
    • 16 - 1B words from ZDC DSM
      
    • 16 - 2B words from the 2 bunch crossing DSMs
      
    
    
  • 2 bytes byte-count byte count for L1 results (m = 128)
    
  • 2 bytes header "L1" in ASCII
    
  • m bytes data L1 Results
    
  • 2 bytes byte-count byte count for L2 results (n = 128)
    
  • 2 bytes header "L2" in ASCII
    
  • n bytes data L2 Results
    

  NOTE: the first raw data block is always for the triggered crossing. The data for the Npre crossings comes immediately after that, and the Npost data blocks come last

• Raw Data Blocks:

  ---

  • 2 byte byte-count: Length of RAW data block including this header (408 B)
    
  • 2 byte header: "RD"
    
  • 2 byte byte-count: Length of CTB data block
    
  • 2 byte header: "CT"
    
  • x bytes data Data from DSMs in CTB crate (x = 256)
    
  • 2 byte byte-count: byte count for MWC
    
  • 2 byte header: "MW"
    
  • 4 byte filler: Filler to align data to 8-byte boundary
    
  • y bytes data Data from DSMs in MWC crate (y = 128 )
    
  • 2 byte byte-count: byte count for EMC DSMs
    
  • 2 byte header: "EM"
    
  • 4 byte filler: Filler to align data to 8-byte boundary
    ------------ below here is just to give an idea
    
  • z bytes data Data from DSMs in EMC crates (z = 0 as of 18 Nov 1999)
    

    ---

  the RAW data block is repeated here npre and npost times.