Region protection unit, instruction set and method for protecting a memory region
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United States of America Patent
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Nov 29, 2011
Grant Date -
Sep 2, 2010
app pub date -
Jan 16, 2007
filing date -
Jan 17, 2006
priority date (Note) -
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Abstract
A memory region protection unit is disclosed that comprises a first register for storing a memory region address, a second register for storing the memory region size, an arithmetic function block for executing an arithmetic function on a memory address provided to the region protection unit and the address value in the first register. The unit further has a comparator for comparing the output of the arithmetic function block with the size value in the second register, the comparator being coupled to an output for signalling the validity of the memory address on the bus The region protection unit has a controller configured to retrieve the memory region address and the memory region size from instructions issued to the region protection unit for associating the unit with said region, and to dissociate the unit from its memory region in response to a further instruction.
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