Media: copper, LVDS-28 bit
Record Length: variable

27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
BOR			HP	PM		STOV			#OBJ VP			#OBJ						#OBJ HP		Data Type					Rec Type
			HP	Turn																Tick
			HP	Track Object(s)
				Vertical Parity

Field Definitions

note: empty cells or cells marked 'reserved' will contain zeros

BOR = beginning of record, "111"

HP = Horizontal Parity bit

PM = Pass-and-Mark, not supported, "00"

STOV = The sextant number, range 0-5

#OBJ VP = Vertical Parity bits for the #OBJ field

#OBJ = The number of Track Objects contained in this record, range 0-24

#OBJ HP = Horizontal Parity bits for the #OBJ field

Data Type = L2STT = "001010"

Rec Type = L2 record, "000"

Turn = The accelerator turn (revolution) number

Tick = The accelerator bunch crossing number

Track Object = Up to 24 track objects are listed and sorted by PT in descending order.
Each track object is 24 bits, defined as:

  [23:20] The relative address of the CPS cluster center, range 0-15

  [19]    Duplicate track bit.  Set to indicate that the STOV is sending this track
          downstream to BOTH neighbouring STSX boards.

  [18:16] The relative address of the trigger sector where the track was found.  Since each STOV board
          sees six trigger sectors normal values for this field are 0-5. If this field is "111" the
          downstream STSX board should IGNORE the track object.  Consult the STOV/STSX TDR for details.
          
  [15]    Set to indicate that this track matched to a CPS cluster
  [14]    Loose CPS cluster association is not supported, "0"
  [13]    Track curvature
  [12:11] Track PT bin ("00" = Max, "01" = High, "10" = Medium, "11" = Low)
  [10:8]  Extended PT information
  [7]     R. Set to indicate that the track matched to a cluster outside the home sector
  [6:1]   Phi. The relative address (within a sector) of the track H layer doublet, range 1-44
  [0]     ISO. Set to indicate an isolated track

Revision History

3 November 2005: created JTO

2 December 2005: changed L2STT data type to "001010" JTO

3 January 2006: added parity links