Co-processor monitoring address generated by host processor to obtain DMA parameters in the unused portion of instructions
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United States of America Patent
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Jan 16, 1996
Issued Date -
N/A
app pub date -
Jul 1, 1994
filing date -
Jun 19, 1991
priority date (Note) -
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Abstract
A co-processor works in conjunction with a primary processor which does not natively support co-processing. In a memory which provides instructions for the primary processor, parameters for use by the co-processor are embedded within the instructions. This is done by placing the parameters in fields which are unused by the primary processor. When the primary processor accesses the local memory, the addresses generated by the primary processor are monitored by the co-processor. When the co-processor detects a pre-determined combination within an address generated by the primary processor, the co-processor accesses the data sent from the local memory to the primary processor. The co-processor then extracts the parameters embedded within the unused fields of the accessed data.
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