Daisy chain cascade configuration recognition technique
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United States of America Patent
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Nov 29, 2011
Grant Date -
Oct 4, 2007
app pub date -
Nov 29, 2006
filing date -
Mar 28, 2006
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Methods and systems provide recognition of a device in a daisy chain cascade configuration. Input circuitry at a device receives an input signal that indicates device configuration following a power-up, reset or other operation of the device. A pulse generator generates a pulse in response to the operation, the pulse occurring while the input signal indicates device configuration. A state latch register stores the state of the input signal in response to the received pulse, thereby storing a state indicating configuration of the respective device. Following this operation, the input circuitry may receive signals unrelated to the device configuration, thereby obviating the need for additional pin assignment.
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