Non-volatile memory usage
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United States of America Patent
Stats
-
Jun 11, 1991
Grant Date -
N/A
app pub date -
Aug 3, 1989
filing date -
Aug 3, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A page printer including a print engine (15) and a controller (11) which includes a non-volatile memory (16) having an EEPROM (17) and a chip RAM (18). A microprocessor (12) under program control manages the placement of data in the EEPROM (17) of the non-volatile memory (16). The EEPROM (17) and the associated chip RAM (18) are structured to have a control block (31) and a data storage portion (32-39). The control block (31) includes pointers (41-47) indicating the locations in the non-volatile memory where data is stored. If a data location becomes faulty, the value of the pointer to that location is changed so that the pointer points to a previously unused portion of the non-volatile memory.
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