First there is the header for each trigger frame

• Header 0 (32-bits)
  • 31:24 = 0x01
  • 23:00 = Event Counter
• Header 1 (32-bits) (dropped in data bank builder)
  • 31:24 = 0x01
  • 23:00 = Event Counter
    
    

Then there are a variable number of MultiSamples which are the 6 samples plus location information which make up a waveform:

• MuliSample n (128 bits)
  • Word 0 (32-bits)
    • 31:16 = Sample 1
    • 15:00 = Sample 0
  • Word 1 (32-bits)
    • 31:16 = Sample 3
    • 15:00 = Sample 2
  • Word 2 (32-bits)
    • 31:16 = Sample 5
    • 15:00 = Sample 4
  • Word 3 (32-bits) 
    • 07:00 = RCE Address
    • 15:08 = FEB Address 
    • 22:16 = APV Channel (0-127)
    • 25:23 = APV # (0-4)
    • 27:26 = Hybrid Address (0-3)
    • 28 = ReadError 
    • 29 = Tail (always 0)
    • 30 = Head (always 0)
    • 31 = Filter flag
      
      

At the end of the frame is the Event Builder tail:

• Event Builder Tail - (32-bits)
  • 27: FIFO backup error (Should only see skip counts if this is 1)
  • 26: ApvBufferAddressSyncError - APV frames didn't have the same addresses
  • 23:12: SkipCount - Number of MultiSamples that got dumped due to FIFO backup
  • 11:00: Number of MultiSamples (M)