Trigger match problems
Contents
Missing trailer word [temporarily fixed][edit | edit source]
Sometimes, a packet is missing the trailer word (identifier: MSB = '111'), which is replaced by a word with all zeros (64-bit zeros) that is interpreted as a data word (TIGER 0, Channel 0, TAC 0, Tcoarse = 0, Ecoarse = 0, Tfine = 0, Efine = 0). This issue seems to affect all the GEMROCs (but not at the same time) and is quite rare (1/250 subRuns), but when occurs the affected subRun has approximately half of the packets with this problem.
Indeed, we discovered that the packets with the missing trailer word are always the ones with the LOCAL L1 COUNT[2:0] > 3. This means that packets from 0 to 3 are OK and then packets from 4 to 7 are missing the trailer word and this is repeated for all the data-stream coming from that GEMROC for that acquisition subRun.
On the contrary, the LOCAL L1 COUNT in the header word is always OK and is used to match packets of different GEMROCs.
An example, with the decoded text version, is reported here:
File:SubRUN 449 GEMROC 6 TM.datout.txt
In the old version of "Decode.py" the trailer word was used to flag the end of the packet and then fill the tree with the hits registered in that packet. This implies that the hits of a packet without the trailer word were stored together with the hits of a subsequent packet with the correct the trailer word. This resulted in, on one hand, one trigger (related to the packet without the trailer word) having no hits and, on the other hand, the next trigger (related to the packet with the proper trailer word) having both its correct hits but also the hits of the previous packet.
A temporary fix has been implemented in "Decode.py" to address this mismatch and restore the correct hits-trigger assignment.
Patch description[edit | edit source]
Instead of using the trailer word to flag the end of each packet we now use the UDP word, which seems to be always correctly present.
Packets mismatch [temporarily fixed][edit | edit source]
TIGER 4-5-6-7 (3rd and 4th FEB for each GEMROC) suffer from packets mismatch: at certain point during acquisition data coming from these TIGER is sent in the next packet w.r.t. data coming from TIGER 0-1-2-3; this offset is present until the acquisition is reset and a new run or subrun is started. A temporary fix has been implemented in "Decode.py" to address this mismatch and restore the correct packets content.
Patch description[edit | edit source]
The program checks if the difference of the hit tcoarse with respect to the L1 timestamp is within the interval [1300-1570] or lower than -64240 or larger than -63960 (to take into account counters roll-over) clock cycles. If the hit is within the interval, it is accepted. If not, the L1 count is set to previous value and the difference with respect to the precedent L1 timestamp. Then the check is performed again.
Moreover, a correction for the roll-over is applied, by adding 2^16 to the difference previously calculated if it is negative.
Several runs have been checked after the application of this patch and data seems to be always stored with the correct time reference (l1ts_min_tcoarse).
Hits with all zeros[edit | edit source]
These data are discarded because they all have delta_coarse = 0.
1100010000000000000000000000000100010110100000011111110110110000 HEADER : STATUS BIT[2:0]: 1: LOCAL L1 COUNT: 00000056 HitCount: 81 LOCAL L1 TIMESTAMP: FDB0; Diff w.r.t. previous L1_TS: 396.543750 us 0000111111110001111110000010000100000011101100100101100101011000 DATA : TIGER: 1 L1_TS - TIGERCOARSE_TS: 1423 LAST TIGER FRAME NUM[2:0]: 7 TIGER DATA: ChID [base10]: 60 tacID: 1 Tcoarse: F821 Ecoarse: 03B Tfine: 0150 Efine: 344 0000000000000000000000000000000000000000000000000000000000000000 DATA : TIGER: 0 L1_TS - TIGERCOARSE_TS: 64944 LAST TIGER FRAME NUM[2:0]: 0 TIGER DATA: ChID [base10]: 0 tacID: 0 Tcoarse: 0000 Ecoarse: 000 Tfine: 0000 Efine: 0 0000000000000000000000000000000000000000000000000000000000000000 DATA : TIGER: 0 L1_TS - TIGERCOARSE_TS: 64944 LAST TIGER FRAME NUM[2:0]: 0 TIGER DATA: ChID [base10]: 0 tacID: 0 Tcoarse: 0000 Ecoarse: 000 Tfine: 0000 Efine: 0 0000000000000000000000000000000000000000000000000000000000000000 DATA : TIGER: 0 L1_TS - TIGERCOARSE_TS: 64944 LAST TIGER FRAME NUM[2:0]: 0 TIGER DATA: ChID [base10]: 0 tacID: 0 Tcoarse: 0000 Ecoarse: 000 Tfine: 0000 Efine: 0 0000000000000000000000000000000000000000000000000000000000000000 DATA : TIGER: 0 L1_TS - TIGERCOARSE_TS: 64944 LAST TIGER FRAME NUM[2:0]: 0 TIGER DATA: ChID [base10]: 0 tacID: 0 Tcoarse: 0000 Ecoarse: 000 Tfine: 0000 Efine: 0 0000000000000000000000000000000000000000000000000000000000000000 DATA : TIGER: 0 L1_TS - TIGERCOARSE_TS: 64944 LAST TIGER FRAME NUM[2:0]: 0 TIGER DATA: ChID [base10]: 0 tacID: 0 Tcoarse: 0000 Ecoarse: 000 Tfine: 0000 Efine: 0 0000000000000000000000000000000000000000000000000000000000000000 DATA : TIGER: 0 L1_TS - TIGERCOARSE_TS: 64944 LAST TIGER FRAME NUM[2:0]: 0 TIGER DATA: ChID [base10]: 0 tacID: 0 Tcoarse: 0000 Ecoarse: 000 Tfine: 0000 Efine: 0 0000000000000000000000000000000000000000000000000000000000000000 DATA : TIGER: 0 L1_TS - TIGERCOARSE_TS: 64944 LAST TIGER FRAME NUM[2:0]: 0 TIGER DATA: ChID [base10]: 0 tacID: 0 Tcoarse: 0000 Ecoarse: 000 Tfine: 0000 Efine: 0 0000000000000000000000000000000000000000000000000000000000000000 DATA : TIGER: 0 L1_TS - TIGERCOARSE_TS: 64944 LAST TIGER FRAME NUM[2:0]: 0 TIGER DATA: ChID [base10]: 0 tacID: 0 Tcoarse: 0000 Ecoarse: 000 Tfine: 0000 Efine: 0 0000000000000000000000000000000000000000000000000000000000000000 DATA : TIGER: 0 L1_TS - TIGERCOARSE_TS: 64944 LAST TIGER FRAME NUM[2:0]: 0 TIGER DATA: ChID [base10]: 0 tacID: 0 Tcoarse: 0000 Ecoarse: 000 Tfine: 0000 Efine: 0 0000000000000000000000000000000000000000000000000000000000000000 DATA : TIGER: 0 L1_TS - TIGERCOARSE_TS: 64944 LAST TIGER FRAME NUM[2:0]: 0 TIGER DATA: ChID [base10]: 0 tacID: 0 Tcoarse: 0000 Ecoarse: 000 Tfine: 0000 Efine: 0 0000000000000000000000000000000000000000000000000000000000000000 DATA : TIGER: 0 L1_TS - TIGERCOARSE_TS: 64944 LAST TIGER FRAME NUM[2:0]: 0 TIGER DATA: ChID [base10]: 0 tacID: 0 Tcoarse: 0000 Ecoarse: 000 Tfine: 0000 Efine: 0 0000000000000000000000000000000000000000000000000000000000000000 DATA : TIGER: 0 L1_TS - TIGERCOARSE_TS: 64944 LAST TIGER FRAME NUM[2:0]: 0 TIGER DATA: ChID [base10]: 0 tacID: 0 Tcoarse: 0000 Ecoarse: 000 Tfine: 0000 Efine: 0 0000000000000000000000000000000000000000000000000000000000000000 DATA : TIGER: 0 L1_TS - TIGERCOARSE_TS: 64944 LAST TIGER FRAME NUM[2:0]: 0 TIGER DATA: ChID [base10]: 0 tacID: 0 Tcoarse: 0000 Ecoarse: 000 Tfine: 0000 Efine: 0 0000000000000000000000000000000000000000000000000000000000000000 DATA : TIGER: 0 L1_TS - TIGERCOARSE_TS: 64944 LAST TIGER FRAME NUM[2:0]: 0 TIGER DATA: ChID [base10]: 0 tacID: 0 Tcoarse: 0000 Ecoarse: 000 Tfine: 0000 Efine: 0 0000000000000000000000000000000000000000000000000000000000000000 DATA : TIGER: 0 L1_TS - TIGERCOARSE_TS: 64944 LAST TIGER FRAME NUM[2:0]: 0 TIGER DATA: ChID [base10]: 0 tacID: 0 Tcoarse: 0000 Ecoarse: 000 Tfine: 0000 Efine: 0 0000000000000000000000000000000000000000000000000000000000000000 DATA : TIGER: 0 L1_TS - TIGERCOARSE_TS: 64944 LAST TIGER FRAME NUM[2:0]: 0 TIGER DATA: ChID [base10]: 0 tacID: 0 Tcoarse: 0000 Ecoarse: 000 Tfine: 0000 Efine: 0 0000000000000000000000000000000000000000000000000000000000000000 DATA : TIGER: 0 L1_TS - TIGERCOARSE_TS: 64944 LAST TIGER FRAME NUM[2:0]: 0 TIGER DATA: ChID [base10]: 0 tacID: 0 Tcoarse: 0000 Ecoarse: 000 Tfine: 0000 Efine: 0 0000000000000000000000000000000000000000000000000000000000000000 DATA : TIGER: 0 L1_TS - TIGERCOARSE_TS: 64944 LAST TIGER FRAME NUM[2:0]: 0 TIGER DATA: ChID [base10]: 0 tacID: 0 Tcoarse: 0000 Ecoarse: 000 Tfine: 0000 Efine: 0 0000000000000000000000000000000000000000000000000000000000000000 DATA : TIGER: 0 L1_TS - TIGERCOARSE_TS: 64944 LAST TIGER FRAME NUM[2:0]: 0 TIGER DATA: ChID [base10]: 0 tacID: 0 Tcoarse: 0000 Ecoarse: 000 Tfine: 0000 Efine: 0 0000000000000000000000000000000000000000000000000000000000000000 DATA : TIGER: 0 L1_TS - TIGERCOARSE_TS: 64944 LAST TIGER FRAME NUM[2:0]: 0 TIGER DATA: ChID [base10]: 0 tacID: 0 Tcoarse: 0000 Ecoarse: 000 Tfine: 0000 Efine: 0 0000000000000000000000000000000000000000000000000000000000000000 DATA : TIGER: 0 L1_TS - TIGERCOARSE_TS: 64944 LAST TIGER FRAME NUM[2:0]: 0 TIGER DATA: ChID [base10]: 0 tacID: 0 Tcoarse: 0000 Ecoarse: 000 Tfine: 0000 Efine: 0 0000000000000000000000000000000000000000000000000000000000000000 DATA : TIGER: 0 L1_TS - TIGERCOARSE_TS: 64944 LAST TIGER FRAME NUM[2:0]: 0 TIGER DATA: ChID [base10]: 0 tacID: 0 Tcoarse: 0000 Ecoarse: 000 Tfine: 0000 Efine: 0 0000000000000000000000000000000000000000000000000000000000000000 DATA : TIGER: 0 L1_TS - TIGERCOARSE_TS: 64944 LAST TIGER FRAME NUM[2:0]: 0 TIGER DATA: ChID [base10]: 0 tacID: 0 Tcoarse: 0000 Ecoarse: 000 Tfine: 0000 Efine: 0 0000000000000000000000000000000000000000000000000000000000000000 DATA : TIGER: 0 L1_TS - TIGERCOARSE_TS: 64944 LAST TIGER FRAME NUM[2:0]: 0 TIGER DATA: ChID [base10]: 0 tacID: 0 Tcoarse: 0000 Ecoarse: 000 Tfine: 0000 Efine: 0 0000000000000000000000000000000000000000000000000000000000000000 DATA : TIGER: 0 L1_TS - TIGERCOARSE_TS: 64944 LAST TIGER FRAME NUM[2:0]: 0 TIGER DATA: ChID [base10]: 0 tacID: 0 Tcoarse: 0000 Ecoarse: 000 Tfine: 0000 Efine: 0 0000000000000000000000000000000000000000000000000000000000000000 DATA : TIGER: 0 L1_TS - TIGERCOARSE_TS: 64944 LAST TIGER FRAME NUM[2:0]: 0 TIGER DATA: ChID [base10]: 0 tacID: 0 Tcoarse: 0000 Ecoarse: 000 Tfine: 0000 Efine: 0 0000000000000000000000000000000000000000000000000000000000000000 DATA : TIGER: 0 L1_TS - TIGERCOARSE_TS: 64944 LAST TIGER FRAME NUM[2:0]: 0 TIGER DATA: ChID [base10]: 0 tacID: 0 Tcoarse: 0000 Ecoarse: 000 Tfine: 0000 Efine: 0 0000000000000000000000000000000000000000000000000000000000000000 DATA : TIGER: 0 L1_TS - TIGERCOARSE_TS: 64944 LAST TIGER FRAME NUM[2:0]: 0 TIGER DATA: ChID [base10]: 0 tacID: 0 Tcoarse: 0000 Ecoarse: 000 Tfine: 0000 Efine: 0 0000000000000000000000000000000000000000000000000000000000000000 DATA : TIGER: 0 L1_TS - TIGERCOARSE_TS: 64944 LAST TIGER FRAME NUM[2:0]: 0 TIGER DATA: ChID [base10]: 0 tacID: 0 Tcoarse: 0000 Ecoarse: 000 Tfine: 0000 Efine: 0 0000000000000000000000000000000000000000000000000000000000000000 DATA : TIGER: 0 L1_TS - TIGERCOARSE_TS: 64944 LAST TIGER FRAME NUM[2:0]: 0 TIGER DATA: ChID [base10]: 0 tacID: 0 Tcoarse: 0000 Ecoarse: 000 Tfine: 0000 Efine: 0 0000000000000000000000000000000000000000000000000000000000000000 DATA : TIGER: 0 L1_TS - TIGERCOARSE_TS: 64944 LAST TIGER FRAME NUM[2:0]: 0 TIGER DATA: ChID [base10]: 0 tacID: 0 Tcoarse: 0000 Ecoarse: 000 Tfine: 0000 Efine: 0 0000000000000000000000000000000000000000000000000000000000000000 DATA : TIGER: 0 L1_TS - TIGERCOARSE_TS: 64944 LAST TIGER FRAME NUM[2:0]: 0 TIGER DATA: ChID [base10]: 0 tacID: 0 Tcoarse: 0000 Ecoarse: 000 Tfine: 0000 Efine: 0 0000000000000000000000000000000000000000000000000000000000000000 DATA : TIGER: 0 L1_TS - TIGERCOARSE_TS: 64944 LAST TIGER FRAME NUM[2:0]: 0 TIGER DATA: ChID [base10]: 0 tacID: 0 Tcoarse: 0000 Ecoarse: 000 Tfine: 0000 Efine: 0 0000000000000000000000000000000000000000000000000000000000000000 DATA : TIGER: 0 L1_TS - TIGERCOARSE_TS: 64944 LAST TIGER FRAME NUM[2:0]: 0 TIGER DATA: ChID [base10]: 0 tacID: 0 Tcoarse: 0000 Ecoarse: 000 Tfine: 0000 Efine: 0 0000000000000000000000000000000000000000000000000000000000000000 DATA : TIGER: 0 L1_TS - TIGERCOARSE_TS: 64944 LAST TIGER FRAME NUM[2:0]: 0 TIGER DATA: ChID [base10]: 0 tacID: 0 Tcoarse: 0000 Ecoarse: 000 Tfine: 0000 Efine: 0 0000000000000000000000000000000000000000000000000000000000000000 DATA : TIGER: 0 L1_TS - TIGERCOARSE_TS: 64944 LAST TIGER FRAME NUM[2:0]: 0 TIGER DATA: ChID [base10]: 0 tacID: 0 Tcoarse: 0000 Ecoarse: 000 Tfine: 0000 Efine: 0 0000000000000000000000000000000000000000000000000000000000000000 DATA : TIGER: 0 L1_TS - TIGERCOARSE_TS: 64944 LAST TIGER FRAME NUM[2:0]: 0 TIGER DATA: ChID [base10]: 0 tacID: 0 Tcoarse: 0000 Ecoarse: 000 Tfine: 0000 Efine: 0 0000000000000000000000000000000000000000000000000000000000000000 DATA : TIGER: 0 L1_TS - TIGERCOARSE_TS: 64944 LAST TIGER FRAME NUM[2:0]: 0 TIGER DATA: ChID [base10]: 0 tacID: 0 Tcoarse: 0000 Ecoarse: 000 Tfine: 0000 Efine: 0 0000000000000000000000000000000000000000000000000000000000000000 DATA : TIGER: 0 L1_TS - TIGERCOARSE_TS: 64944 LAST TIGER FRAME NUM[2:0]: 0 TIGER DATA: ChID [base10]: 0 tacID: 0 Tcoarse: 0000 Ecoarse: 000 Tfine: 0000 Efine: 0 0000000000000000000000000000000000000000000000000000000000000000 DATA : TIGER: 0 L1_TS - TIGERCOARSE_TS: 64944 LAST TIGER FRAME NUM[2:0]: 0 TIGER DATA: ChID [base10]: 0 tacID: 0 Tcoarse: 0000 Ecoarse: 000 Tfine: 0000 Efine: 0 1110000011010011000110000000110000111101000000000000000000000000 TRAILER: LOCAL L1 FRAMENUM [23:0]: 0698C0: GEMROC_ID: 0C TIGER_ID: 7 LOCAL L1 COUNT[2:0]: 5 LAST COUNT WORD FROM TIGER:CH_ID[5:0]: 00 LAST COUNT WORD FROM TIGER: DATA[17:0]: 00000 0100110011000000000000000000000010100000000000000000000001010110 UDP_SEQNO: GEMROC_ID: 0C UDP_SEQNO_U48: 000000000056 STATUS BIT[5:3]:6
