Electromagnetic Calorimeter Trigger Operations

Initial Startup of the L1EMT subsystem

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The L1EMT system is located in a self contained 9U VME crate in the bottom of rack 21. The boards in the crate are:
 
• Triggered Read Out Module (ROM) slot 2,

Fast Control Distribution Module (FCDM) slot 4,
10 Trigger Processor Boards (TPB) slots 6 - 10 & 12 - 16,
Trigger Carrier Board (TCB) slot 11.

Upon initial power up of the crate all the LEDs will flash on every board. After this a few will remain on and are listed below:


• ROM - green i960 on, all others off. 
• FCDM - No LEDs on
• TCB - All LED's should be illuminated. They are all red and should be on for normal running currently. Also in the bottom group of LED's the top and bottom pairs should be on.
• TPB - Orange GEO0- 3, These describe the goemetric address of the board in the crate and are made up of a 4 bit word. The order as seen in the crate is:
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  0, 9, 1, 8, 2 --- 7, 3, 6, 4, 5
          - Block of Green LEDs, these describe status of the Xilinx FPGA's and should all be on

          - ERR3 - Red LED, This shows that the boards are unsynchronised

          - PBSEL Flashes once per second

          - VX0 & 1: Yellow LED on

          - D9 - Also shows unsynchronised nature of boards

          - All others OFF
   

Upon initial connection to a fast control partition then ERR3 & D9 will both go out. The seperate crate mask is 400 for the EMT system.

There are several modes in which the EMT system can be run though these can only be accesed when using the fcgui program provided by Dataflow and so should NOT be tried by shift personel. Only regular  datataking from the Run Control should be done.
 

Running the L1EMT System

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When running, the EMT system will give a constant error for cables due to the uncalibrated nature of the EMC and its cabling. This is to be ignored currently.

It is importent that the links to the downloadable libraries for the ROM are the correct versions. Due to the nature of development it is better that only a note is made of the links in the following dir;

ls -al /nfs/bbr-srv02/dataflow/ir-2/emt/app

When running print out this list for future reference.

Also the downloadable constants should be checked. Using the following list;

ls -al /nfs/bbr-srv02/dataflow/constants/emt/aaaalink*.*

Also print this out.

Both of these printouts should be stuck into the EMT logbook which will be kept in the control room.

The EMT is now ready to be included in the partition as usual.
 

Possible Problems

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Currently at trigger rates above that of the scintillator it is possible that the ROM & FCGM will show full, this will hang the system currently. This is know and will be made widely known to shift crew.

Spares for both the TPB's & the TCB are located in the TestStand in the dataflow lab (CLA). A proper note of observed behaviour before replacement and the serial no. of the offending board must be made as well as the serial no. of the replacement.

If there is a wish to run with non-standard configuration or any misbehaviour from the system is observed then you MUST contact David Wallom (x3761).