Method for multiple match detection in content addressable memories
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United States of America Patent
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Mar 25, 2003
Issued Date -
N/A
app pub date -
Sep 24, 2001
filing date -
Jul 12, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for detecting n match conditions within a CAM array. The method consists of precharging a sense node and a reference node of a differential amplifier in an inactive state to a supply voltage level. The reference node voltage level is then changed to a reference voltage level between a voltage level corresponding to n match condition signals and n-1 match condition signals by turning on a reference device, The sense node voltage level is changed to a voltage level corresponding to a number of match condition signals by turning on a corresponding number of matchline devices, and the reference voltage level is compared to the voltage level corresponding to the number of match condition signals by switching the differential amplifier to an active state. An output signal corresponding to the result of the comparison is then provided from the differential amplifier. The method can further include a step of switching the differential amplifier to the inactive state when the output signal is provided.
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