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

Image Number 11 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
Secondary battery pack including insulative mounting member into which PCM is inserted in lateral direction
Adaptive block pre-fetching method and system
Image processing device, image forming apparatus, and non-transitory computer readable recording medium
Nonvolatile semiconductor memory device and method for controlling the same
MIM capacitor and associated production method
Estimating optical characteristics of a camera component using sharpness sweep data
Transfer formulas
  Randomly Featured Patents
Catalyzed mica tapes for electrical insulation
Remote optical wave measurement sensor
Surface temperature measuring device with reversible thermochromic film
Method for replacing software modules utilizing a replacement address table
Snowboard binding with a controlled instep element
Method for extracting malodorous compounds present in a formulation containing at least one compound carrying a thiol group and deodorized compositions thus obtained
Ratio comparator for digital signals
Method of rolling light gauge hot mill band on a hot reversing mill
Solid state trip circuit with digital timer
Capacitor protection circuit for protecting storage capacitors in an electronic power supply