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White Rabbit Trigger Distribution
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White Rabbit Trigger Distribution
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2ed5fc47
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2ed5fc47
authored
Sep 30, 2019
by
Dimitris Lampridis
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[doc] describe front-panel connections for SVEC-TDC-FD
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doc/ref_svec_tdc_fd.rst
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@@ -78,3 +78,38 @@ FMC-FD. :ref:`event_id` ``LC-O1`` corresponds to the first FMC-FD output, and so
their default behaviour. However this should be done with extreme care, as it could lead
to a race condition between the User Application and the WRTD Applications running inside
the FPGA.
The front-panel LEMO connectors of the SVEC are used as follows:
+---------------+-----------------------------------+
| **Connector** | **Function** |
+===============+===================================+
| L1 | WR 1-PPS output |
+---------------+-----------------------------------+
| L2 | Not used |
+---------------+-----------------------------------+
| L3 | WR external reference clock input |
+---------------+-----------------------------------+
| L4 | WR external 1-PPS input |
+---------------+-----------------------------------+
The front-panel LED indicators have the following meanings:
+---------------------------+----+----+----------------------------+
| **Function** | **LED** | **Function** |
+===========================+====+====+============================+
| WR link activity | 4 | 8 | WR link up |
+---------------------------+----+----+----------------------------+
| FMC-FD clock locked to WR | 3 | 7 | FMC-TDC clock locked to WR |
+---------------------------+----+----+----------------------------+
| WR locked | 2 | 6 | Not used |
+---------------------------+----+----+----------------------------+
| VME bus access | 1 | 5 | WR 1-PPS |
+---------------------------+----+----+----------------------------+
.. hint:: LED colors follow a certain convention:
* A green LED means ``OK`` or ``on``.
* A LED that is turned off means ``off`` or ``not active``.
* A red LED means ``error``.
* An orange LED signifies ``activity`` (used by LEDs 1, 4 and 5).
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