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--- sweeper_usb_daq_data_format [2017/06/09 18:04]
pereira [The Sweeper USB DAQ data format]
+++ sweeper_usb_daq_data_format [2017/06/11 17:26] (current)
pereira [The Sweeper USB DAQ data format]
@@ Line 1: / Line 1: @@
 ====== The Sweeper USB DAQ data format ======
-Two crates are read by the Sweeper DAQ software, one CAMAC and one VME. Data from each of these controllers are pushed into ring buffers (**rawccusb** for CCUSB and **rawvmusb** for VMUSB). The Sweeper Event Builder (EVB) reads  data from these ring-buffers, correlates (and "glues" them) on the basis of their time stamps, and outputs the resulting data stream on the ring buffer **sweeper**. According to the NSCLDAQ 11.x protocol, data in the ring buffer **sweeper** will be organized in ring items, each consisting of two fragments, one for each controller.
+Two crates are read by the Sweeper DAQ software, one CAMAC and one VME. Data from each of these controllers are pushed into [[http://docs.nscl.msu.edu/daq/newsite/nscldaq-11.2/c43.html|ring buffers ]] (**rawccusb** for CCUSB and **rawvmusb** for VMUSB). The Sweeper Event Builder (EVB) reads  data from these ring-buffers, correlates them on the basis of their time stamps, and outputs the resulting data stream on the ring buffer **sweeper**. According to the NSCLDAQ 11.x [[http://docs.nscl.msu.edu/daq/newsite/nscldaq-11.2/x4509.html|format]], data in the ring buffer **sweeper** will be organized in ring items, each consisting of two fragments, one for each controller.
+The structure of the data from the Sweeper EVB is schematically illustrated in the figure below:
+{{:wiki:diagram_ringitem_fromevb.png?800|Schematic representation of data format from Sweeper EVB}}
+Events from the Sweeper EVB will be encapsulated in ring items, consisting of header, a body header, and a body. The body part contains two fragments, one from each controller. Each fragment has a header, followed, again, by a ring item (with its corresponding header, body header, and body).
-This section describes the data format coming from each controller. (Please, note that this data format  is irrelevant for the user; this is so because the USB data are "pre-unpacked" by the [[Pre-unpacker|Sweeper Pre-unpacker]] software before being distributed to the user.)
+The structure from the body of each fragment is described below in some detail. Please, note that this data format  is irrelevant for the user; this is so because the USB data are "pre-unpacked" by the [[Pre-unpacker|Sweeper Pre-unpacker]] software before being distributed to the user.

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