Hot standby method and apparatus
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Oct 14, 2008
Grant Date -
Jul 19, 2007
app pub date -
Sep 9, 2003
filing date -
Sep 10, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An apparatus provides hot standby operation with normal and standby processors, each of which includes vital inputs electrically interconnected with the vital inputs of the other processor, vital outputs, and an application routine inputting the vital inputs and outputting the vital outputs. Communication ports communicate with communication ports of the other processor. A health routine provides a health status after communication is established with the other processor. A vital relay includes an input controlled by a vital output and an output to a vital input of the other processor. A synchronization routine provides a synchronization status through the communication ports. The application routine outputs the vital outputs when the synchronization status is set. The standby processor includes a reset routine, which resets the standby processor when the health status of that processor is not provided. A vital 'OR' circuit outputs from the vital outputs of the normal and standby processors.
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