Resources Contact Us Home
Fast linear tag validation unit for use in microprocessor

Image Number 8 for United States Patent #6157986.

A linearly addressed cache capable of fast linear tag validation after a context switch or a translation lookaside buffer (TLB) flush. The cache is configured to validate multiple linear address tags to improve performance in systems which experience frequent context switches or TLB flushes. The cache comprises: a data array configured to store a plurality of cache lines, a linear tag array, a physical tag array, and a TLB. Each array is configured to receive a portion of a requested address. Each linear tag stored in the linear tag array corresponds to one cache line stored within the data array. Each physical tag stored in the physical tag array also corresponds to one cache line stored within the data array. The TLB is configured to store linear to physical address translations, while the linear tag array is configured to store status information for each linear tag. The status information comprises a linear tag valid bit and an enable compare bit. The linear tag array is configured as a content addressable memory and is configured to perform a parallel comparison of a first portion of the requested address with each of the plurality of stored linear tags. If one of the tags match, the linear tag array sets the corresponding valid bits if the corresponding enable compare bits are set. The linear tag array may also be configured to clear the enable compare bits in parallel.

  Recently Added Patents
Downlink scheduling in fractional frequency reuse (FFR) systems
System for programming domestic appliances and method for programming assembly-line programmable domestic appliances
Decision management system and method
Image processing apparatus, image processing method, and program to create a composite image from color image data and monochrome image data
Instantaneous single click perpetual date mechanism
Mobile device case with storage compartment
Data latch circuit and electronic device
  Randomly Featured Patents
Acoustic image localization apparatus for distributing tone color groups throughout sound field
Electric heating textile
Truck clearance anti-collision device
Dust collector
Intermediate layer material of three-layer resist system and method of forming resist pattern
Vehicle ramp
Spinning reel
Capstan drive type magnetic recording tape drive apparatus
Automatic baking apparatus and mixbag therefore