Research Of Low Power Cache Based On The Method Of Data Amplification Delay

In modern computer architecture, CPU's speed is much faster than the memory. Cache is a classical technique for speed up the data access. It can bridge gap the between high-speed processors and low-speed main memory. It has applied in many aspects of computer technique ,but high performance Cache dissipates significant energy of CPU. The research of high performance low power Cache has significant means for the computer system, especially for the embedded system.Simplescalar simulator and watch simulator are computer architecture based simulators. Simplescalar simulator realized the pipeline and out of order function. Wattch simulator realized the computation of power and the delay of Cache. This article analysed the core code of these two simulators based on high performance and low power's point of view.When a traditional associate Cache accesses a Cache block, it must access all the ways in the row, it increases the power consumption of access. For a n-way associate Cache, the access of n-1 way is meaningless. This article based on the data sense amplify postponement Cache, brought in the valid-bit pre-decision, proposed a partial tag comparison Cache using valid-bit pre-decision (PTC-V Cache). It could decrease the useless power consumption of accessing an invalid Cache block. So it could cut down the Cache's energy dissipation and decrease the whole system's power.We ran the SPEC95 standard test program on Wattch simulator.The result showed that for the I-Cache, under the 0.13μm technology, the proposed PTC-V Cache could eliminate about 12% of the average power consumption of the original PTC Cache, in the best situation it could have 40% improved rate in power consumption. For the traditional associate Cache, our PTC-V Cache eliminated 55% of the unnecessary power consumption on average. Under the 0.35μm technology, the proposed PTC-V Cache can reduce 10% of power consumption of the PTC Cache, and this number could achieve 32% in the best. For the traditional associate Cache, PTC-V Cache could reduce 28% of the energy dissipation on average.