DYNAMIC IMPEDANCE CONTROL FOR INPUT/OUTPUT BUFFERS
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United States of America Patent
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N/A
Issued Date -
Sep 22, 2016
app pub date -
Mar 24, 2016
filing date -
Mar 24, 2016
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A system and method of performing off chip drive (OCD) and on-die termination (ODT) are provided. A common pull-up network composed of transistors and a common pull-down network composed of transistors are employed to implement both of these functions. In drive mode, the pull-up network is configured to produce a calibrated drive impedance when an “on” output is to be generated, and the pull-up network is configured to produce a calibrated drive impedance when an “off” output is to be generated. In termination mode, the pull-up network and the pull-down network are configured to produce a calibrated pull-up resistance and pull-down resistance respectively such that together, they form a split termination.
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