Content addressable memory cell
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United States of America Patent
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Nov 12, 2002
Grant Date -
N/A
app pub date -
Aug 22, 2001
filing date -
Aug 22, 2001
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Abstract
Architecture, circuitry, and methods are provided for producing a content addressable memory (CAM). The CAM includes one or more CAM cells arranged in an array. Each CAM cell is symmetrical about its x- and y-axis to form rows and columns of the array. Additionally, each CAM cell can use either SRAM or DRAM storage cells implemented in either a binary or ternary arrangement. If the CAM cell is a ternary SRAM design, then the cell size is no more than 4 microns by 1-1/2 microns, assuming a 0.15 micron critical dimension. Critical dimension is noted as the smallest resolvable size for the particular process being employed. The CAM cell utilizes a selection circuitry that will disable the compare circuit during times when a compare operation is not being performed. This will ensure the compare circuit will not consume power during, for example, a read or write operation. Each CAM cell uses no more than eight conductors per cell, wherein the conductors are of minimum width and pitch arranged co-planar on a single metal layer. Another metal layer utilizes local interconnects and a pair of conductors which carry the differential bit lines and compare lines. The local interconnects do not extend across the entire cell and, therefore, are localized to only a small region of a cell to effectuate power and ground supplies to the CAM cell.
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- 15 United States
- 10 France
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Patent Owner(s)
- AVAGO TECHNOLOGIES GENERAL IP (SINGAPORE) PTE. LTD.
International Classification(s)
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Jin, Bo | Campbell, CA | 93 | 549 |
Roge, Manoj | San Jose, CA | 3 | 72 |
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Fee | Large entity fee | small entity fee | micro entity fee | due date |
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Fee | Large entity fee | small entity fee | micro entity fee |
---|---|---|---|
Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
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