This paper first analyzes the inside drive of support in hardware for Java virtual machmne in embedded Java systems,and the basic requirement and design principles,then it introduces 5 kinds of designs and their primary technology features,and analyzes their chief motivations,advantages and disadvantages,and the possible fields in which they can be applied. Based on all these,the paper presents our Java chip JC401 in which JIT compiler is used,and examines its technology details. At last ,the paper makes a simple analysis and summary on all these designs.
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