Media: fiber optic, GLINK
Record Length: variable, depends on the number of reported tracks
| 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | ||||||||
| VRB START | Header Length | #Objects | |||||||||||||||||||||||||
| Header Format | Object Format | Object Length | |||||||||||||||||||||||||
| Tick | Data Type | ||||||||||||||||||||||||||
| Turn | |||||||||||||||||||||||||||
| FW Minor Version | FW Major Version | ||||||||||||||||||||||||||
| Status Bits | |||||||||||||||||||||||||||
| Track Object(s) | |||||||||||||||||||||||||||
| Data Type | Tick | ||||||||||||||||||||||||||
| Vertical Parity | |||||||||||||||||||||||||||
| Pad Frame(s) | |||||||||||||||||||||||||||
| VRB END | |||||||||||||||||||||||||||
note: empty cells will contain zeros
VRB START = "0101"
Header Length = 0x03
#Objects = the number of Track Objects, range 0-48
Header Format = Header Format, "001"
Object Format = Object format, "00001"
Tick = The accelerator bunch crossing number
Data Type = varies with quadrant: CTQD0 = 0xAF, CTQD1 = 0xB0, CTQD2 = 0xB1, CTQD3 = 0xB2
Turn = The accelerator turn (revolution) number
FW Minor Version = 0x00
FW Major Version = varies with the firmware version
Status Bits = Reserved for diagnostic data
Track Objects are 32 bits long, which requires two frames in this record.
Bits [31:16] go into the first frame and bits [15:0] go into the second frame. The 32 bits are defined as:
[31]: Track curvature bit
[30:29]: Track PT bin ("00" = Max, "01" = High, "10" = Medium, "11" = Low)
[28:26]: Extended PT information
[25]: Set to indicate a tight CPS cluster match
[24]: Loose CPS cluster match, unsupported and forced to "0"
[23:21]: reserved, "000"
[20]: 'R' bit. Set to indicate that the track matched to a CPS cluster outside the home sector
[19:16]: The relative position of the cluster center within the home sector, range 0-15
[15:10]: Track phi value, range 1-44
[9]: Set to indicate an isolated track
[8:7]: "00"
[6:0]: Trigger sector number, range 0-79
Vertical Parity = not supported, 0x0000
Pad Frame(s) = Pad frames are inserted in order to make the total record length a multiple of 8 frames.
This requirement is imposed by the VRB hardware.
VRB END = "1010"
2 November 2005: created JTO
3 January 2006: added parity links