Hardware memory write lock circuit
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United States of America Patent
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-
Jun 14, 1983
Grant Date -
N/A
app pub date -
Feb 21, 1980
filing date -
Feb 21, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A hardware circuit for protecting against the accidental writing in an area of memory which contains critical data. In order to access the critical data memory area during a write cycle, it is necessary first to control predetermined memory access cycles which include, for example, the writing of predetermined data at a predetermined address. After detection of such a 'fictitious' write cycle, the hardware allows the next write cycle to access the critical data memory area.
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