Variable length decoding system having a mask circuit for improved cache hit accuracy

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United States of America Patent

PATENT NO 6404359
SERIAL NO

09580129

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Abstract

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In a decoding system having a cache memory, for decoding a variable length code such as a MH code, the decoding is carried out by accessing the cache memory by using a variable length code as an address. Whether the cache memory is hit or mishit is judged by discriminating whether or not the code bits of the 7 bits succeeding to the firstly appeared '1' in the actual code is coincident with the tag stored in the cache memory. This comparison is carried out by masking bits other than an effective bit length of the actual code, by utilizing the three-bit information indicating the number of remaining bits in the actual code, succeeding to the firstly appeared '1', outputted from the cache memory. Thus, the decoding system is capable of elevating the hit rate of the cache memory.

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Patent Owner(s)

Patent OwnerAddress
NEC ELECTRONICS CORPORATION1753 SHIMONUMABE NAKAHARA-KU KAWASAKI-SHI KANAGAWA

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Sakai, Katsumi Tokyo, JP 11 282

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