Instruction cache configured to provide instructions to a microprocessor having a clock cycle time less than a cache access time of said instruction cache
申请公布号:US5752259(A)
申请号:US19960621960
申请日期:1996.03.26
申请公布日期:1998.05.12
发明人:TRAN, THANG M.
分类号:G06F9/38;G06F12/08;(IPC1-7):G06F12/00
主分类号:G06F9/38
摘要:An apparatus including a banked instruction cache and a branch prediction unit is provided. The banked instruction cache allows multiple instruction fetch addresses (comprising consecutive instruction blocks from the predicted instruction stream being executed by the microprocessor) to be fetched concurrently. The instruction cache provides an instruction block corresponding to one of the multiple fetch addresses to the instruction processing pipeline of the microprocessor during each consecutive clock cycle, while additional instruction fetch addresses from the predicted instruction stream are fetched. Preferably, the instruction cache includes at least a number of banks equal to the number of clock cycles consumed by an instruction cache access. In this manner, instructions may be provided during each consecutive clock cycle even though instruction cache access time is greater than the clock cycle time of the microprocessor. Because consecutive instruction blocks from the instruction stream are fetched concurrently, the branch prediction unit stores a prediction for a non-consecutive instruction block with each instruction block. For example, for an instruction cache having a cache access time which is twice the clock cycle time, a prediction for the second consecutive instruction block following a particular instruction block within the predicted instruction stream is stored. When a pair of consecutive instruction blocks are fetched, predictions for a second pair of consecutive instruction blocks within the instruction stream subsequent to the pair of consecutive instruction blocks are formed from the branch prediction information stored with respect to the pair of consecutive instruction blocks.
PROCESS AND APPARATUS FOR HEAT-TREATING SMALL-DIAMETER METAL BAR
MEASURING GOLF CLUB, METHOD FOR DETERMINING SUITABLE GOLF CLUB, AND GOLF CLUB
COMMUNICATION GAME SYSTEM, RECORDING MEDIUM, AND PROGRAM
WIRING BOARD WITH BUILT-IN CAPACITOR
NON-VOLATILE SEMICONDUCTOR MEMORY DEVICE
INSULATING FILM PEELING APPARATUS FOR STRAIGHT ANGLE WIRE
JOINT CONNECTOR AND JOINT CONNECTOR COMBINED UNIT
MODULAR SYSTEM CUSTOMIZED BY SYSTEM BACKPLANE
VEHICLE-MOUNTED FLYWHEEL BATTERY
PLATE-LIKE FORMED BODY MADE OF CARBON FIBER-REINFORCED COMPOSITE MATERIAL
SIDE LOBE SUPPRESSION METHOD FOR ADAPTIVE ANTENNA
TIRE DISTORTION STATUS DETECTION METHOD, DISTORTION STATUS DETECTION DEVICE, AND TIRE THEREOF