The added search flexibility comes at an additional cost over binary CAM as the internal memory cell must now encode three possible states instead of the two of binary CAM.

Cams without register-90Cams without register-34

Thus, a CAM is the hardware embodiment of what in software terms would be called an associative array.

The data word recognition unit was proposed by Dudley Allen Buck in 1955.

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Number plates must be returned when not allocated to a vehicle or the vehicle is not registered, including cancelling a vehicle registration.

A major interface definition for CAMs and other network search engines (NSEs) was specified in an interoperability agreement called the Look-Aside Interface (LA-1 and LA-1B) developed by the Network Processing Forum, which later merged with the Optical Internetworking Forum (OIF).

Numerous devices have been produced by Integrated Device Technology, Cypress Semiconductor, IBM, Broadcom and others to the LA interface agreement.Content-addressable memory is often used in computer networking devices.For example, when a network switch receives a data frame from one of its ports, it updates an internal table with the frame's source MAC address and the port it was received on.Content-addressable memory (CAM) is a special type of computer memory used in certain very-high-speed searching applications.It is also known as associative memory, associative storage, or associative array, although the last term is more often used for a programming data structure.The extra circuitry also increases power dissipation since every comparison circuit is active on every clock cycle.