2019 Proposed Frame Formats

The following describes the proposed data format as it is handed off to the CODA ROC.

The event builder will accept a single Trigger Frame from the PCI-Express TI card and receive 7 RSSI Output Frames from the RCEs.

The event builder will format the received data as shown below when copying it into the data buffer provided by the ROC. The ROL will pre-pend this data with a 64-bit EVIO header.

The following data is formatted once for each of N triggers in a block 

• Event Bank (variable size)
  • Event EVIO Header Word 0 (32-bits)
    • 31:00 = Event bank size, excluding word 0
  • Event EVIO Header Word 1 (32-bits)
    • 31:25 = 0x00
    • 24 = Sync FLAG from trigger event word 0
    • 23:16 = Event type from trigger event word 0
    • 15:08 = Time stamp from trigger event word 2
    • 07:00 = Event number from trigger event word 1
      
      
  • Trigger Bank (6 x 32-bits)
    • Trigger EVIO Header Word 0 (32-bits)
      • 31:00 = 0x05 (trigger bank size minus word 0)
    • Trigger EVIO Header Word 1 (32-bits)
      • 31:16 = 0xE10A
      • 15:14 = 0x0
      • 13:08 = 0x01
      • 07:00 = ROC ID (different for each of two event builders)
        
        
    • Trigger Event Word 0 (32-bits)
    • Trigger Event Word 1 (32-bits)
    • Trigger Event Word 2 (32-bits)
    • Trigger Event Word 3 (32-bits)
      
      
  • Data Bank (variable size)
    • Data EVIO Header Word 0 (32-bits)
      • 31:00 = Data bank size minus word 0
    • Data EVIO Header Word 1 (32-bits)
      • 31:16 = 0x0003
      • 15:14 = 0x0
      • 13:08 = 0x01
      • 07:00 = ROC ID (different for each of two event builders)
    • MultiSample Data associated with this trigger from frames received from each of 7 RCEs  (M * 4 * 32-bits)

The above frame format will then repeat N times, once for each trigger in a block. A gather process will be required as follows:

for (x = 0; x < N (BlockSize); x++) {

    Compare trigger number for event x with each RCE event counter for event x

    Add Event EVIO Header, leave size empty for now

    Add Trigger EVIO header

    Copy 4 trigger words from trigger frame for event x

    Add Data EVIO header, leave size empty for now

   for ( y = 0; y < 7; y++ {

      Copy MultiSample Data from RCE y for event x

   }

   Fill in Data EVIO Header Size

   Fill in Event EVIO Header Size

}