Difference between revisions of "FADC Data Format September 2, 2014"
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##We discussed the CDC pedestal readout range and decided to start off with a scaling factor of 1/4 which should give us a huge range of 0-1023. The scaling factor is to be a configuration parameter, but the field width is fixed. We hope that the variation in pedestal height (even in noise bursts) will lie within ADC range 0-255, so that we can later change the scaling factor to 1. This will be determined when we record pedestal data with beam on. | ##We discussed the CDC pedestal readout range and decided to start off with a scaling factor of 1/4 which should give us a huge range of 0-1023. The scaling factor is to be a configuration parameter, but the field width is fixed. We hope that the variation in pedestal height (even in noise bursts) will lie within ADC range 0-255, so that we can later change the scaling factor to 1. This will be determined when we record pedestal data with beam on. | ||
− | ##There were a few | + | ##There were a few suggestions made to make the format document clearer. |
Revision as of 15:59, 2 September 2014
Location and Time
Room: CC F326-327
Time: 2:00pm-3:00pm
Remote Connection
(if problems, call phone in conference room: 757-269-6460)
- 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: 462136260
- US or Canada: +1 408 740 7256 or
- US or Canada: +1 888 240 2560
- More information on connecting to bluejeans is available.
Agenda
- Previous meeting (Aug 19, 2014)
- Status of FADC125 Firmware
- File:NSJ draft fADC125 spec 4 4.pdf
- File:NSJ draft fADC125 spec 4 5.pdf
Quantity | field width (bits) | field maximum | scaling factor 1/n | maximum before scaling |
---|---|---|---|---|
pedestal | 8 | 255 | 4 | 1023 |
integral | 14 | 16383 | 16 | 262143 |
amplitude | 9 | 511 | 8 | 4095 |
Useful Links
- FDC_pulse_data_format
- CMU timing algorithm - details updated
- CDC readout needs Garfield calcs
- fADC125 Data Format Specification Document
- fADC125 operation and data format requirements (June 17, 2014)
- File:FADC125 dataformat 250 modes.docx
- File:FADC250 modes 2.docx
Minutes
Present: Naomi (CMU), Beni, David, Cody, Lubomir (JLab)
- FADC125 status
- Beni has tested modes 1, 2 and 3 of the FA250-ported-firmware and they work as expected, he could change the sparsification thresholds and saw them taking effect. He found that the thresholds need to be absolute; the threshold should include the pedestal height. Mode 7 (top of page 4) should include 3 words in data formats 7 + 8 + 10 (pulse time, pulse integral, pulse pedestal) and this has to be enabled in the software library. After this, all being well, Cody would like to replace the bad cards which have been identified and upload the firmware onto the rest of the crates.
- Cody has started work on merging the new algorithm into the firmware for simulation.
- Data format
- We discussed the CDC pedestal readout range and decided to start off with a scaling factor of 1/4 which should give us a huge range of 0-1023. The scaling factor is to be a configuration parameter, but the field width is fixed. We hope that the variation in pedestal height (even in noise bursts) will lie within ADC range 0-255, so that we can later change the scaling factor to 1. This will be determined when we record pedestal data with beam on.
- There were a few suggestions made to make the format document clearer.