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
Method and apparatus for complementing an instrument panel by utilizing augmented reality
Liquid crystal display wherein the data lines covered by each pixel electrode are supplied with data signals of opposite polarities
Vaccine composition against Streptococcus pyogenes
Method for fabricating a nitrided silicon-oxide gate dielectric
Nucleic acids for cloning and expressing multiprotein complexes
Method and system for testing indirect bandgap semiconductor devices using luminescence imaging
Projection-type video-image display apparatus
  Randomly Featured Patents
Channel estimation for time division duplex communication systems
Sheet feeding apparatus, sheet feeding method and control program
Fully implantable cochlear implant system
Data transfer protection in a multi-tasking modeling environment having a protection mechanism selected by user via user interface
Distributed virtual machine architecture
Wrist watch
Composition and method for slowly dissolving siliceous material
Sheet supply apparatus
Gallium nitride-based light emitting device having ESD protection capacity and method for manufacturing the same
Image forming apparatus having photoconductor drum and fuser independently operable in timing