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Coding for sensing in Content Addressable Memories | IEEE Conference Publication | IEEE Xplore

Coding for sensing in Content Addressable Memories


Abstract:

We study binary Content Addressable Memories (CAMs) that employ a resistive element to store content. A CAM has a match line for every word stored which is sensed in orde...Show More

Abstract:

We study binary Content Addressable Memories (CAMs) that employ a resistive element to store content. A CAM has a match line for every word stored which is sensed in order to determine a match/no match condition. We show how simple, low redundancy coding techniques can dramatically improve the ability to differentiate a match from a mismatch, effectively allowing a CAM design that stores nearly twice as many bits in the same memory as a competing design that stores each bit and its complement. The theory of coding for asymmetric errors is relevant in this problem; we rely on it to prove that ⌊n/2⌋ out of n constant weight codes are optimal for sensing.
Date of Conference: 13-18 June 2010
Date Added to IEEE Xplore: 23 July 2010
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Conference Location: Austin, TX, USA

References

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