Apparatus and method for utilizing an auxiliary data memory unit in a data processing system having separate program and data memory units
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United States of America Patent
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May 24, 1988
Grant Date -
N/A
app pub date -
Aug 9, 1985
filing date -
Mar 23, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In a data processing system in which the program memory unit and the internal data memory unit are separately addressed, and which special instructions for transferring data between these two units are available, apparatus and method are described for increasing the memory available for the internal data memory unit. The increased storage space takes the form of an auxiliary data memory unit that is activated when the special instruction for the transfer of data signal groups between the program memory unit and the data memory unit are evoked. Apparatus is provided for identifying the presence of the special instructions, and this identification generates the signals for inactivating the program memory unit and for activating the auxiliary data unit for the purposes of transfer of data signal groups between the internal data unit and the auxiliary data memory unit.
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