Command_Structure:

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   Command data structure for external commands supplied to DFF system.

   Since version 7.
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   Form:
   cmd = Command_Structure( n );
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   ------
   Inputs
   ------
   n            (1)    Number of command structures to generate

   -------
   Outputs
   -------
   cmd          (.)    Command data structure with fields:
                          - timeTag
                          - scID
                          - module
                          - command
                          - data

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