A description of the standalone monitoring for LVL1 trigger signals through TDAQ:

The receiver system is located in Level 1 USA15. On each side (A and C), We have two ADCs. Each ADC is a 12bit,100MHz with 8 channels (Joerger model VTR10012). Since the input clock and trigger signals are TTL, we needed to make NIM to TTL conversion. For this we are using a Quad 4 Fold AND/OR/MAJ, NIM-TTL TTL-NIM Level Translator and Fan-In Fan-Out (VME V976B from CAEN). The clock and trigger signals are brought from TTC crates located in Level 1. We used BNC cables which are routed through from Level 1 to Level 2. Using BNC-lemo adapter we connect these cables to the V976B module. The LVL1 signals are brought using the monitoring boards. The actual connections are:

  • TBB (on-detector) to USA15 (back of the receivers)
  • Signals are spied on through the backplane then multiplexed using the monitoring board.
  • From monitoring board to transformers through differential cables (these are then converted into single-ended signals - lemo output)
  • From lemo output to the ADC.

The monitoring selection is very convenient (implemented in TDAQ using the UsbController module):

  • For calibration runs which include: connectivity tests and OF-data (actual calibration data) the runtype is Trigger therefore all the monitoring processes are done automatically. The only things that need to be set is which FEC feedthrough we want to look at (HfecCrate, HfecFt) and the what is the corresponding receiver crate (myCrate).
  • For runtype physics, there is a freedom either to use default values (GetMonGuiValues = 0) or the values from the gui (GetMonGuiValues = 1). The actual default values are set for routing the channels from the receiver crate for cosmic run purposes.
  • For the cosmic run, we use exclusively the EMB receiver crates (EMBC and EMBA). And for this purpose we re-route the first four channels from each of the four cables. This gives a total of 16 channels per side, to look at in the same time.

On the gui one can select the receiver crate to monitor namely through the parameter (myCrate) which takes the following values:

  • EMB: receiver crate has myCrate = 0.
  • EMEC: receiver crate has myCrate = 1.
  • FCALHEC: receiver crate has myCrate = 2.
  • TILE: receiver crate has myCrate = 3.

-- ChaoukiB - 06 Oct 2006

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Topic revision: r3 - 2006-10-13 - ChaoukiB
 
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