Media: fiber optic, GLINK
Record Length: fixed

	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
1	VRB START				Header Length								#Dwords MSb				#LVDS Links
2					Header Format			Object Format					#Dwords LSb
3					Tick								Data Type
4					Turn
5					FW Minor Version								FW Major Version
6					Reserved for diagnostic data
:					Input Link Data Block (56 frames)
63					Data Type								Tick
64	VRB END				Vertical Parity

Field Definitions

note: empty cells will contain zeros

VRB START = "0101"

Header Length = 0x03

#Dwords MSb = number of data words (upper nibble) = 0

#LVDS Links = 4 = "0100"

Header Format = Header Format, "010"

Object Format = Object format, "00001"

#Dwords LSb = number of data words (lower byte) = 56 = 0x38

Tick = The accelerator bunch crossing number

Data Type = 0x0A

Turn = The accelerator turn (revolution) number

FW Minor Version = 0x00

FW Major Version = varies with firmware version

Input Link Data Block = Four FPSS L1 records links are concatenated and stored here as follows:

  "0000"+link0 frame1 bits[27:16]
  link0 frame1 bits[15:0]
  "0000"+link0 frame2 bits[27:16]
  link0 frame2 bits[15:0]
  ... 
  "0000"+link3 frame7 bits[27:16]
  link3 frame7 bits[15:0]

Vertical Parity = Vertical parity bits calculated over frames 1-63

VRB END = "1010"

Revision History

2 November 2005: created JTO
4 January 2006: added parity links