Memory paging method and apparatus
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United States of America Patent
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Oct 13, 1992
Grant Date -
N/A
app pub date -
Dec 5, 1988
filing date -
Dec 5, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus to operate a paged memory system which uses only a single, predetermined address per page as a memory-mapped address. When the single memory-mapped address is accessed repeatedly by an unusual sequence, a sequence detector changes the currently addressed page of memory to a new page. The unusual sequence is a normally absurd sequence of READs to a single unchanged address location. Because the unusual sequence only uses the predetermined address and not the data stored therein, the address location is usable as a normal RAM location for all other operations. Such a method and apparatus permits an expansion of the memory space in an electronic data system where there are a fixed number lines in the address bus and where the electronic data system is already using the maximum number of addresses which can be accessed by the address bus in one cycle.
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