This paper

by analyzing the traditional master switch method based on the AHB bus architecture

putting forward three new master switch methods

and also giving the key circuit design of there method and making a comparison of the simulation results. For further more

in order to provide a comprehensive basis for readers selecting a appropriate method to the master switch in different conditions

the paper also gives out the simulation results of the four methods

and make an analysis of there results

and compares the advantages and disadvantages of there methods.