Modification and use of configuration memory used during operation of a serial bus
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United States of America Patent
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-
Nov 4, 2003
Grant Date -
N/A
app pub date -
Nov 16, 1999
filing date -
Mar 25, 1999
priority date (Note) -
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status (Latency Note)
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Abstract
Information stored in configuration memory of a first device coupled to a communication bus is exposed to other devices allowing the other devices to ascertain the functionality of the first device. A device driver corresponding to the device can, through an interface, cause a bus driver to alter the contents of the configuration memory thereby changing what information is exposed to other devices. When another device 'enumerates' the now-altered configuration memory, the other device will learn of the new functionality and proceed in a normal fashion by loading those drivers necessary to use the newly-added functionality. Conversely, when a device and its corresponding device driver is removed, configuration memory is updated accordingly. The present invention may be beneficially applied to systems adhering to the IEEE 1394 Serial Bus standard.
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