1. Run experience Cover FW SRB FW DAQ and monitoring
Straw readout status
PL for straw team
Run experience
Cover FW
SRB FW
DAQ and monitoring

2. Current Status Timing stability Pc-farm data
Latency shift problem understood (TTCrx chip control) and fixed
T0 shift at start run understood (?), will be fixed in new Cover fw
Speeds up straw start after power-on from few hours to less then 1 hour
Pc-farm data
MEP fixed
1->16
Data rate per burst (at nominal intensity):
Raw data ≈1.2 GB/SRB
Trigger matched data (400k triggers) ≈70 MB/SRB
Cover firmware
Currently used cover firmware v15 is not fully efficient for covers near the beam line at nominal beam intensity
Tested cover_v16 fw did not solve the problem but gave us hints
Straw Detector Status

3. Run experience - DAQ

4. TDAQ Straw Detector Status
Run experience - DAQ
Straw readout system is stable and working
No major hardware issues
Expert interventions are needed rarely (during run)
Data inefficiency at nominal beam intensity
Only covers near beam line are affected
New cover firmware tested during last days of the run (inconclusive results), to be fixed for 2016 run
2.5Gb/s links on SRB
Sensitive on chip fitting
Caused problem in the last FW
TDAQ Straw Detector Status

5. Run experience - Straw Online Software
Run control interface and configuration (DIM server)
Working very well
Planned new features: more checks after each burst – read and store hit counters, lost hit counters, etc.
Raw data monitoring and analysis
Basic useful features working and used heavily: occupancies, latency look-up, software trigger matching, …
More tools planned: study efficiency, possibilities for trigger primitives from Straw, …
Straw Detector Status

6. Run experience - Raw Data Monitor
Standard situation (28 Oct)
Closed Tax (27 Oct)
Thresholds
After power cut (25 Oct)
After cable swap (19 Oct)
Straw Detector Status

7. Run experience - Services
Overall, all services worked very well
HV distribution remarkable
Few ‘hot spots’ in noise
External noise coupled through services?
Possibly related to HV GND not floating
Other?
TTI power supply for ELMBs
Lost connection few times
Radiation problem?
DCS must introduce ‘heartbeat’
Often not sure whether system is monitored or not
Sergey to introduce it in DCS

8. Cover data flow (simplified)
One measurement in 12.5ns
FIFO
512
TDC R
TDC F
FIFO
512
LINK
40M x 8bits
(320 Mb/s)
FIFO
2048
16 straws
Note:
One measurement 24 bits, needs 3 write accesses to link
FIFO
512

9. Cover FW (now) ‘spikes’ in the beam of factor 2->3 Version 15
Link usage
3 data + 1 ‘comma’ resulting in 10MHz measurement transmission rate
Fixed data multiplexing
Always circular full scan even if straw not present
OK for all but few covers close to the beam
Average straw rate 66kHz
66kHz x 16 (straws) x 2 (r/f edge) = 2.1MHz (<10MHz)
Max straw rate 600kHz
600kHz x 10 (straws, exaggerated) x 2 (r/f edge) = 12MHz (>10MHz)
To this one should add noise, CARIOCA oscillations, etc
‘spikes’ in the beam of factor 2->3
For average rate OK (3 x 2.1MHz= 6.3MHz, less then 10MHz)
For max rate extra data must be accommodated in FIFOs
Factor 2; FIFO good to more then 2us x 512 ~ 1ms

10. Cover FW (new) New version 16 Improve TDC Improve link usage
+/- ½ clock cycle T0 shift
Improve link usage
Remove 1 clock cycle gap between data
Data transmission rate 40MHz/3 = 13.3MHz
Improve data multiplexing
Use “round-robin” instead of circular full scan
Access only buffers with data
Eliminates empty cycles
“password on everything” not done
Link problem probably due to MPOD HV not floating
Wait for tests

11. Cover FW Cover links are now stable Possible improvements if needed
Increase link speed to 480Mb/s
60MHz x 8bits writing
60MHz/3 = 20MHz measurements (from 13.3MHz)
Needs to be checked for the longest links
Add second link
Now used for parameter and monitoring
Scaling data bandwidth by 1.5 due to protocol

12. Uriah Heep – Lady In Black
SRB links ‘reloaded’
“…for in darkness I was walking, And destruction lay around me from a fight I could not win”
Uriah Heep – Lady In Black

13. SRB 2.5Gb/s link problem?

14. SRB FW 2.5Gb/s links sensitive to fitting, often timing violations
Few ALTERA IP bugs discovered and fixed
QUARTUS 15.1; finally reasonable documentation
Byte ordering pattern reversed
Preemphasis/slew_rate limited to factor 0->3 (used 4)
Check if the same link in all SRBs
Problem on PCB?

15. SRB – FE_INTF Improved in new FW version LINK 125M x 16bits (2Gb/s)
FIFO
8192
Cover link
320Mb/s
FIFO
8192
Cover link
320Mb/s
LINK
125M x 16bits
(2Gb/s)
SYNCH FIFO 8
FIFO
8192
Cover link
320Mb/s
Note:
One measurement 48 bits, needs 3 write accesses to link
Total possible rate 40MHz
Estimated need 10MHz (safety factor 4)
FIFO
8192
Cover link
320Mb/s

16. SRB – EVENT_MGR Improved in new FW version TRIGGER MATCH
FIFO
1024
FE_INTF link
2Gb/s
FIFO
1024
FE_INTF link
2Gb/s
TRIGGER MATCH
80MHz (160MHz?)
SYNCH FIFO
2048
FIFO
1024
FE_INTF link
2Gb/s
FIFO
1024
FE_INTF link
2Gb/s
Note:
FE_INTF link 3x16bits (max 40MHz, est 10MHz)
Trigger match 1x48 bits (max 80MHz)

17. SRB – EVENT_MGR 4 FE_INTF links Trigger match What is needed?
Each 40MHz data; 125MHz/3x16bits
Total rate 4x40MHz = 160MHz
Trigger match
Originally designed for 160MHz
Downscaled to 80MHz
What is needed?
Total track rate 15MHz
SRB sees max 8MHz
Number of measurements
8MHz x 2.5 (number of straws) x 2 (r/f edge) = 40MHz
80MHz seems to be sufficient
‘peaks’ equalized in buffers

18. SRB data flow All parts of SRB designed to more then expected rate
Safety factors 2->4
All data receiving and reformatting parts will be monitored for possible data loss
All SRBs checked with VME online monitoring after EOB
Any data loss should be avoided
Ethernet link good up to few 100kHz of trigger
Depends on event size
CARIOCA extra hits in high rate ?
Does it make sense to use the second link?
Routers and pc-farm?

19. DAQ and monitoring plans
Include new 2.5Gb/s link setup and check
Recheck cover FW v16
Include delay settings
Any link restart if needed should be automated
Second Ethernet link if needed
Monitoring
All cover status every burst
All SRB status every burst
Increase VME speed for raw data monitoring