关键词: MCU, 预取加速, Flash控制器

Abstract: A fetching-accelerating flash controller,was designed in this paper for the sake of solving fetching speed problems of a low-cost and low-power MCU.Based on the mechanisms of fetching and cache,a method combining bitwise-expanding and promoted-fetching techniques was adopted.This Flash controller accomplished the conversion between Flash interface and AHB protocols,while improving the system performance and fetching efficiency.Furthermore,an explicit protection mechanism was proposed to protect the use code.What'smore,an SoCsimulation experiment platform was established to confirm the correctness of the design.The simulation results show that the fetching performance was improved 16.3%at most.Finally,the design hasbeen confirmed in an example wafer.

Key words: MCU, fetching-accelerating, Flash controller