GAB/2
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10.5.3 Measurements Provided for Diagnostic
Monitor Output
The monitor output reflects the Gradient current provided by the gradient current connector.
This output is intended for diagnostic purpose. It can be useful for debugging the hardware or
software (pulse programs). The relation is 1 Volt (monitor voltage) per 1 Amperes (gradient
current).
Logging of LVDS link
For diagnostic purpose, the GAB/2 hardware provides recording of the LVDS link data -
incoming requests for specific gradient currents are logged (aimed value and time stamp in a
raster of 10 ns). So, it can be checked if the real time gradient commands correspond exactly
with the gradient defined by the pulse program in TopSpin. This feature is accessible over the
Service Web - the logging buffer can be reset before running an experiment, and the resulting
information is displayed afterwards.
10.5.4 GAB/2 Control State Machine
Figure10.5: The GAB/2 Control State Machine
After Power Up of the BSMS, the GAB/2 Control State Machine steps through the necessary
steps for getting operational. First, the FPGA design is reloaded from the Flash, and after
correct setup of the hardware - if no error occurs - the final state Operation is reached. In this
state the GAB/2 is ready for handling the incoming requests over LVDS.
It is possible to switch off the GAB/2 or to start some specific operations (e. g. Firmware
Download or Automatic Offset Calibration) when the GAB/2 is in any state. After completion
of a specific operation, the GAB/2 is re-initialized. In the end - on successful Initialization - the
GAB/2 is ready/operational again.
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General