System and method for enabling continued use of trim values within an implantable medical device following a parity error

A method for use with an implantable medical device equipped to use trim values, the method comprising:

• storing a first set of trim values within a random access memory (RAM) of the device;
• storing a second, different set of trim values within a read-only memory (ROM) of the device;
• performing device functions using the trim values stored within RAM;
• and
• detecting an error indicative of possible corruption of RAM and, in response, loading the trim values from ROM into RAM to enable continued operation of the device using trim values despite the error, wherein detecting an error indicative of possible corruption of RAM includes detecting a software reset and then determining whether the software reset was due to a parity error in RAM.

A method for use with an implantable medical device having memory equipped to store trim values, the method comprising:

• storing optimized trim values at trim value memory locations within random access memory (RAM) prior to operation of the device;
• storing nominal trim values in read-only memory (ROM) prior to operation of the device;
• upon activation of the device, loading the optimized trim values into separate RAM locations devoted to storing loaded trim values;
• performing device functions using the loaded trim values under the control of device software;
• detecting a software reset during operation of the device;
• determining, in response, whether a parity error occurred in RAM;
• if a parity error occurred, then loading the nominal trim values from ROM into the separate RAM locations devoted to storing loaded trim values to enable continued operation of the device using the nominal trim values despite the parity error;
• and
• if a parity error did not occur, then reloading the optimized trim values from RAM into the separate RAM locations devoted to storing loaded trim values to enable continued operation of the device using optimized trim values.

A system for use with an implantable medical device equipped to utilize trim values, the system comprising:

• random access memory (RAM) operative to store a first set of trim values;
• read-only memory (ROM) operative to store a second set of trim values;
• and
• a trim value reset controller operative to detect an error indicative of possible corruption of RAM and, in response, loading the trim values from ROM into RAM to enable continued operation of the device using the ROM trim values despite the error, wherein the trim value reset controller is operative to detect an error indicative of possible corruption of RAM by detecting a software reset and then determining whether the software reset was due to a parity error in RAM.

A system for use with an implantable medical device equipped to utilize trim values, the system comprising:

• means for storing a first set of trim values within a random access memory (RAM) of the device;
• means for storing a second set of trim values within a read-only memory (ROM) of the device;
• and
• means for detecting an error indicative of possible corruption of RAM by detecting a software reset;
• means for determining whether the software reset was due to a parity error in RAM and,
• means for loading the trim values from ROM into RAM to enable continued operation of the device using the ROM trim values despite the error.