Difference between revisions of "FADC Data Format February 10, 2015"
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== Useful Links == | == Useful Links == | ||
* [[CDC_algo|Timing algorithm - updated to include latest revisions]] | * [[CDC_algo|Timing algorithm - updated to include latest revisions]] | ||
− | * [ | + | * [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=2274 fADC125 Data Format Specification Document] |
* [[:File:FADC125_dataformat_250_modes.docx|Data format for 250 modes on fADC125 from Cody, Aug 15 2014]] | * [[:File:FADC125_dataformat_250_modes.docx|Data format for 250 modes on fADC125 from Cody, Aug 15 2014]] | ||
* [[:File:FADC250_modes_2.docx|FA250 modes 2 from Ed and Hai, Feb 18 2014]] | * [[:File:FADC250_modes_2.docx|FA250 modes 2 from Ed and Hai, Feb 18 2014]] |
Latest revision as of 17:05, 24 February 2017
Location and Time
Room: CC L207
Time: 2pm.
Remote Connection
(if problems, call phone in conference room: 757-269-6460 might not be the correct number)
- To join via Polycom room system go to the IP Address: 199.48.152.152 (bjn.vc) and enter the meeting ID: 589693655.
- To join via a Web Browser, go to the page [1] https://bluejeans.com/589693655.
- To join via phone, use one of the following numbers and the Conference ID: 589693655
- US or Canada: +1 408 740 7256 or
- US or Canada: +1 888 240 2560
More information on connecting to bluejeans is here
Specific instructions for connecting via polycom:
- Turn polycom on if necessary
- With the polycom, place a call at 199.48.152.152
- Press # to enable the polycom keypad, then enter the meeting id: 589693655 and #
- You may have to unmute the microphone: #*4
- Turn the computer on if needed
Agenda
- Previous meeting (Feb 3, 2015)
- Status of FADC125 Firmware
Useful Links
- Timing algorithm - updated to include latest revisions
- fADC125 Data Format Specification Document
- Data format for 250 modes on fADC125 from Cody, Aug 15 2014
- FA250 modes 2 from Ed and Hai, Feb 18 2014
- FIRMWARE for FADC250 Ver2 ADC FPGA, Sept 2014?
- FDC_pulse_data_format
- CDC readout needs Garfield calcs
- CDC_run_985 CDC_run_970
Minutes
Present: Naomi (CMU), Cody, Beni, Sergey (JLab)
- Cody has been testing the firmware with a pulser to find the minimum time between triggers with which the 250-modified firmware can be used successfully. He has been testing this with trigger pulse at constant rate and increasing that rate and monitoring for errors. The problems occur in multiblock mode (this is with more than 1 event per block) when two triggers occur too close together and the second trigger arrives before the fadc is ready to be read out; it gives a block error but its buffer is not emptied and after the next trigger it reads out the old data in the buffer; from then on the data are out of sync with the data read out from the other modules, and the whole block has to be discarded.
- He has found that in mode 8, with 200 samples, the firmware is good at rates up to 5kHz, and with mode 7, 200 samples, it is good for rates up to 34 kHz. This was with NSA=2, NSB=15. Next he will try NSA=5, NSB=60.
- David has ported the new firmware timing algorithm into the analysis library. Naomi will try it out.
- Naomi suggested giving the new firmware's time module a time limit - we know the max number of clock cycles that it should use, if it takes more than this then something is wrong. She has not found any example pulses which would cause this.
- We talked about the error conditions returned by the time module, including some rare conditions caused by faulty fADCs.