What Does Static Mode Refer to in the 6602 Manual?

Updated Jun 13, 2018

Reported In

Hardware

  • PXI-6602
  • PCI-6602
  • Counter/Timer Device
  • Digital I/O Device

Issue Details

The catalog specifications for the 660x family calls the Data Transfer type for the 6602's Digital I/O section static. What does static mean here?

Solution

Static I/O is also commonly referred to as Unstrobed I/O or Immediate I/O. Static is another word for programmed I/O without buffers. Every digital read or write the board performs must be initiated by a software command. Upon receiving a software command, one or more digital lines or ports immediately inputs or outputs a pattern. Static I/O does not require status and control signals. However, because no hardware timing is employed, transfer speeds are completely software and computer dependent. As a result, static I/O is normally used for low-speed applications.

Additional Information

The opposite of Static I/O, is Nonstatic or Strobed operations. These methods allow multiple operation to occur with one software call. Examples include interrupt or DMA driven inputs and outputs that require less programmatic interaction and use less CPU overhead, but are not available on this board. Strobed operations can be found on a number of National Instruments digital I/O boards.

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