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ACIS has significant on-board-processing with a multitude of operating modes. The duties may be listed as:
Figure 3.2 gives an overview of the data flow through ACIS. The key data processing tasks are divided between the two types of processor sections.
The next two sections describe the on-board data processing flow. Two fundamentally different processing schemes apply, depending upon whether the CCD data is collected as timed exposures, or as continuous clocking. First the timed exposures will be described, followed by the continuous data processing.
The basic division of responsibility between the Back and Front End Processors is as follows. The Back End Processors (BEP) must perform:
The Front End Processors (FEP) must perform: