End Event word format

Word structure

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
HD	DS	1	1	L2B(2)		L1T(2)		EB(2)		TC1	TC2	EB(4)				PA	Event Tag(8)

L2B L2 Buffer id

L1T L1 Trigger info

PA Parity bit for this event

Notes:

The L1 Trigget info bits are a condesed summary of the L1 trigger decision. They are computed starting form the 64-bit L1 trigger word in the XTF-A board. The actual meaning of these two bits is described in the XTF documentation.
The PArity bit is computed taking the bitwise XOR of all data words in the event (23 bits/word) excluding the End Event word.
The End Event word is a packet by itself and therefore has EP=EE=1 (bits 21 and 22)
The bits 13 and 14 are new assignment for the good track counter.

1	bit 9	PE	Parity Error
2	bit 10	LS	Lost Sync
3	bit 11	FO	Fifo Overflow
4	bit 12	ID	Invalid Data
5	bit 13	TC1	Number of good tracks > 0 (was Internal Overflow)
6	bit 14	TC2	Number of good tracks > 1 (was Truncated Output)
7	bit 15	GL	G-link Lost-lock
8	bit 16	E2	Parity Error in cable to Level 2