Devices and methods for controlling active termination resistors in a memory system
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United States of America Patent
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-
Mar 1, 2005
Grant Date -
Sep 16, 2004
app pub date -
Feb 13, 2004
filing date -
Oct 19, 2001
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An active termination circuit is mounted in a memory circuit and includes a termination resistor which provides a termination resistance for the memory circuit, and a control circuit which receives an externally supplied active termination control signal, and which selectively switches on and off the termination resistor in response to the active termination control signal. The control circuit includes a synchronous input buffer and an asynchronous input buffer which each receive the active termination control signal, and a switching circuit which selectively outputs an output of said synchronous input buffer or an output of said asynchronous input buffer according to an operational mode of the memory circuit. The output of the switching circuit controls an on/off state of said termination resistor.
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