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White Rabbit Trigger Distribution
Commit 2ed5fc47 authored by Dimitris Lampridis's avatar 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 ...@@ -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 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 to a race condition between the User Application and the WRTD Applications running inside
the FPGA. 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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