Apparatus for live bus insertion of add-on devices
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United States of America Patent
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Jun 25, 1996
Issued Date -
N/A
app pub date -
Jun 7, 1995
filing date -
Feb 26, 1993
priority date (Note) -
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Abstract
An apparatus for allowing an add-on device to be inserted onto an active bus and configurable within one bus cycle is provided. The apparatus includes passive circuits used with a sequential multi-length pin arrangement on an I/O module. The apparatus also decouples the source of power to the I/O module from other devices on the bus which limits the disruption of power during the insertion. The I/O module limits current drawn from a backplane containing the bus which may disrupt signals during the insertion of the add-on device. And finally, the I/O module also limits bus signal disruption during insertion by precharging signal pins, increasing the resistance between the add-on I/O module pins and the backplane and adding capacitance to the bus.
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