Translation look-aside buffer with a tag memory and method therefor
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United States of America Patent
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Jan 17, 2012
Grant Date -
Dec 9, 2010
app pub date -
Jun 9, 2009
filing date -
Jun 9, 2009
priority date (Note) -
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status (Latency Note)
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Abstract
A translation look-aside buffer (TLB) has a TAG memory for determining if a desired translated address is stored in the TLB. A TAG portion is compared to contents of the TAG memory without requiring a read of the TAG memory because the TAG memory has a storage portion that is constructed as a CAM. For each row of the CAM a match determination is made that indicates if the TAG portion is the same as contents of the particular row. A decoder decodes an index portion and provides an output for each row. On a per row basis the output of the decoder is logically combined with the hit/miss signals to determine if there is a hit for the TAG memory. If there is a hit for the TAG memory, a translated address corresponding to the index portion of the address is then output as the selected translated address.
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