Resources Contact Us Home
Method and apparatus for cascading content addressable memory devices

Image Number 9 for United States Patent #6148364.

A method and apparatus for cascading content addressable memory (CAM) devices is disclosed. The method and apparatus may be particularly useful when depth cascading CAM devices that operate in a flow-through mode. In the flow-through mode, a compare instruction may be simultaneously provided to each CAM device in the cascade, and the match address, data stored at the matched location, or other status information may then be output to a common output data bus by the highest priority matching CAM device in the same cycle that the instruction is provided to the CAM devices. Each CAM device may have a cascade input and a cascade output to perform the cascade function. The cascade output of a higher priority CAM device may be connected to the cascade input of the next lower priority CAM device. The higher priority CAM device may assert a cascade signal on its cascade output at a predetermined time after receiving an input signal (e.g., a clock signal). Asserting the cascade signal may indicate that the higher priority CAM device has completed the compare instruction. When the lower priority CAM device detects that the cascade signal has been asserted on its cascade input, the lower priority CAM device may sample the match flag of the higher priority CAM device to determine if the lower priority CAM device may output its data to the common output data bus.

  Recently Added Patents
Beaconing and superframe structure for millimeter wave wireless technologies
Reduced plating ignitron
Method of and apparatus for image denoising
Energy drink package
Battery cell separator
Display device and method of manufacturing the same
Imaging lens with three lens elements, and electronic apparatus having the same
  Randomly Featured Patents
Conformal two dimensional electronic scan antenna with butler matrix and lens ESA
Unit print head assembly for an ink-jet printer
Crop upper part counter rotating stripper and stalk lower part cutter with crusher
Business rules system
Magnetic field measuring apparatus and apparatus for measuring spatial resolution of magnetic field detector
Interior illumination system for vehicles, in particular, motor vehicles
Test strip incubation device
Disposable swab
Electrically erasable programmable non-volatile semiconductor memory device and method for manufacturing the same
Air pump operated test fixture and method for testing a circuit board