Dynamic receiver clamp that is enabled during periods in which overshoot is likely
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United States of America Patent
Stats
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Jul 19, 2005
Grant Date -
Apr 7, 2005
app pub date -
Oct 1, 2003
filing date -
Oct 1, 2003
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A dynamic clamp 200 selectively clamps overshoot on a signal line 100 when overshoot is likely, while not clamping the received signal at times when overshoot is not likely encountered. A Driver Disable signal 102 disables the output of an output driver 110 so that it presents a high impedance to the signal line 100. An activation element 310 asserts a Clamp Enable signal 311, for example, in response to a transition of the received signal that occurs, for example, during a period in which a corresponding Driver Disable signal 102 is asserted. A deactivation element 320 asserts a Clamp Disable signal 321, for example, a predetermined deactivation delay period after the Clamp Enable signal 311 is asserted. A clamping portion 330 selectively clamps the received signal 100 beginning with the assertion of the Clamp Enable signal and ending with the assertion of the Clamp Disable signal.
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