Classifier CAM Accelerates Searching And Filtering

April 3, 2000
A 1-Mbit ternary/2-Mbit binary, dual-port, classification content-addressable memory (CAM) offers a 15-ns search time and a 30-ns latency. It's designed for high-speed search and filter applications in layers 2 through 4 and above for switches and...

A 1-Mbit ternary/2-Mbit binary, dual-port, classification content-addressable memory (CAM) offers a 15-ns search time and a 30-ns latency. It's designed for high-speed search and filter applications in layers 2 through 4 and above for switches and routers. It includes configurable lookup tables, letting it operate in a combination of binary and ternary modes selected by multiple banks. The binary mode has 68 bits by 32 kwords, 136 bits by 16 kwords, or 272 bits by 8 kwords. The ternary mode features 68 bits by 16 kwords, 136 bits by 8 kwords, or 272 bits by 4 kwords. In classification applications, the CAM can improve performance and quality of service. The edge router adds a priority-bit tag based on the contents of each data packet before sending it to the ISP. When the ISP router reads the received tagged packet, it allocates bandwidth for the packets based on those priority tags. Powered by 2.5- and 3.3-V supplies, the KE5BCCA1MA classification CAM costs $45. It's housed in a 324-contact BGA.

Kawasaki LSI USA Inc., 2570 N. First St., Ste. 301, San Jose, CA 95131; (408) 570-0555; fax (408) 570-0567.

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