Difference between revisions of "IntegrationDaq 240405"
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# Draft timing diagram: [https://moller.jlab.org/cgi-bin/DocDB/public/ShowDocument?docid=790 DocDB 790] | # Draft timing diagram: [https://moller.jlab.org/cgi-bin/DocDB/public/ShowDocument?docid=790 DocDB 790] | ||
# Michael, Bob, Brynne, and Paul should put together a list of the integrator running modes we would like to have available | # Michael, Bob, Brynne, and Paul should put together a list of the integrator running modes we would like to have available | ||
| − | #* To keep the data volume manageable, we'd like to use 32-bit words for the accumulated values we transfer when running at the ~2kHz. A 32-bit word would overflow after 16384 18-bit samples are accumulated. At the nominal 14.7MHz sampling rate, this is about 1.1us. | + | #* To keep the data volume manageable, we'd like to use 32-bit words for the accumulated values we transfer when running at the ~2kHz. A 32-bit word would overflow after 16384 18-bit samples are accumulated. At the nominal 14.7MHz sampling rate, this is an integration period of about 1.1us. |
#** To support longer integration periods, what is best choice: | #** To support longer integration periods, what is best choice: | ||
#**# Accumulate in 32-bit words, but change the setting of the effective sampling rate so that we wouldn't saturate | #**# Accumulate in 32-bit words, but change the setting of the effective sampling rate so that we wouldn't saturate | ||
Revision as of 15:13, 5 April 2024
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Meeting information
Meeting time: 1:00pm Eastern Zoom connection information is sent out by email; please reach out to Paul if you don't have the current link.
Agenda
- Activity updates
- General discussion
Open Issues to be followed up later
- Discussions with M. Pitt & J. Musson to understand the beam monitor signals we'll be getting
- Draft timing diagram: DocDB 790
- Michael, Bob, Brynne, and Paul should put together a list of the integrator running modes we would like to have available
- To keep the data volume manageable, we'd like to use 32-bit words for the accumulated values we transfer when running at the ~2kHz. A 32-bit word would overflow after 16384 18-bit samples are accumulated. At the nominal 14.7MHz sampling rate, this is an integration period of about 1.1us.
- To support longer integration periods, what is best choice:
- Accumulate in 32-bit words, but change the setting of the effective sampling rate so that we wouldn't saturate
- Apply an software-selectable bit shift to the ADC values before they are accumulated in 32-bit words
- Accumulate the sums in 64-bit words, but have an option to either transfer just the low 32-bits or transfer the full 64 bits.
- To support longer integration periods, what is best choice:
- To keep the data volume manageable, we'd like to use 32-bit words for the accumulated values we transfer when running at the ~2kHz. A 32-bit word would overflow after 16384 18-bit samples are accumulated. At the nominal 14.7MHz sampling rate, this is an integration period of about 1.1us.
Minutes
Recording at zoomgov:
Participants:
