Added documentation about toggling WG and XST processing

docs/source/devices/sdp.rst

@@ -62,6 +62,8 @@ Waveform Generator
 
 The antenna input of SDP can be replaced by an internal waveform generator for debugging and testing purposes. The generator is configured per antenna per FPGA:
 
+.. note:: The Waveform Generator needs to be toggled off and on using ``FPGA_wg_enable_RW`` for new settings to become active on the station.
+
 :FPGA_wg_enable_RW: Whether the waveform generator is enabled for each input.
 
   :type: ``bool[N_fpgas][N_ants_per_fpga]``
@@ -91,5 +93,6 @@ For example, the following code inserts a wave on LBA subband 102 on FPGAs 8 - 1
   sdp.FPGA_wg_amplitude_RW = [[0.1] * 12] * 16
   sdp.FPGA_wg_frequency_RW = [[102 * 200e6/1024] * 12] * 16
 
-  # enable waveform generator
+  # toggle and enable waveform generator
+  sdp.FPGA_wg_enable_RW = [[False] * 12] * 16
   sdp.FPGA_wg_enable_RW = [[True] * 12] * 16

docs/source/devices/sst-xst.rst

@@ -8,6 +8,8 @@ The statistics are exposed in two ways, as:
 - *Attributes*, representing the most recently received values,
 - *TCP stream*, to allow the capture and recording of the statistics over any period of time.
 
+If the statistics are not received or zero, see :ref:`statistics-debugging`.
+
 See the following links for a full description of the SST and XST monitoring and control points:
 
 - https://support.astron.nl/confluence/pages/viewpage.action?spaceKey=L2M&title=L2+STAT+Decision%3A+SC+-+SDP+OPC-UA+interface
@@ -76,6 +78,25 @@ Conversely, to calculate the block index for an antenna pair ``(a,b)``, use::
   def block_nr(a: int, b: int) -> int:
       return baseline_index(a // 12, b // 12)
 
+Configuring the XSTs
+`````````````````````````````
+
+The XSTs can be configured with several settings:
+
+.. note:: The XST processing needs to be toggled off and on using ``FPGA_xst_processing_enable_RW`` for new settings to become active on the station.
+
+:FPGA_xst_processing_enable_RW: Whether XSTs are computed on each FPGA.
+
+  :type: ``bool[N_fpgas]``
+
+:FPGA_xst_integration_interval_RW: The time interval to integrate over, per FPGA, in seconds.
+
+  :type: ``float[N_fpgas]``
+
+:FPGA_xst_subband_select_RW: The subband to cross correlate, per FPGA. Note: only the entries ``[x][1]`` should be set, the rest should be zero.
+
+  :type: ``uint32[N_fpgas][8]``
+
 Subscribe to statistics streams
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