Direct memory access controller and method therefor
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United States of America Patent
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Jul 16, 2002
Grant Date -
N/A
app pub date -
Oct 25, 1999
filing date -
Oct 25, 1999
priority date (Note) -
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status (Latency Note)
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Abstract
Direct memory access controller (DMAC) (54) adapted to directly execute C language style FOR tasks assigned by a processor (70), where the FOR task includes a movement of a data element from a first location to a second location in memory. The DMAC includes multiple execution units (EUs) (88, 90, 92), each to perform an arithmetic or logical operation, and a FOR task controller (80, 82, 86) to perform the data movement. The FOR task controller selects the operation to be performed by the EU. In one embodiment, the FOR task is made up of C language type FOR loops, where descriptors identify the control and body of the loop. The descriptors identify the source of operands for an EU, and the source may be changed within a FOR task. A descriptor specifies a function code for an EU and may specify multiple sets of operands for the EU.
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