Method and apparatus for varying instruction streams provided to a processing device using masks
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United States of America Patent
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-
Nov 16, 2004
Grant Date -
Oct 2, 2003
app pub date -
Jan 6, 2003
filing date -
Dec 17, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A circuit is provided to provide instruction streams to a processing device: embodiments of the circuit are appropriate for use with RISC CPUs, whereas other embodiments are useable with other processing devices, such as small processing devices used in a field programmable array. The circuit receives an external instruction stream which provides a first set of instruction values, and has a memory which contains a second set of instruction values. Two or more outputs provide instruction streams to the processing device. The circuit has a control input in the form of a mask which causes a selection means to allocate bits from the first and second sets of instruction values to different instruction streams to the processing device.
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