| 摘要 |
PROBLEM TO BE SOLVED: To provide an instruction cache system for fetching instruction data to be read the next by a central processing unit(CPU) in advance from a program memory in a high speed instruction cache, and for reading the instruction data from the instruction cache, the instruction cache system to prevent the mishit of instruction data in the instruction cache whose capacity is small and to improve the performance of a microprocessor. SOLUTION: An instruction cache 1-2 is constituted of two faces, and while the instruction data are being fetched from one face by a central processing unit(CPU), the instruction data of the next program are transferred from a main storage program memory 1-6 to the other face, and those faces are alternately switched according to the switching of switches 1-3 and 1-4, and the instruction fetch and the transfer of the instruction data of the next program are operated in parallel. Also, the program is divided into a program pieces so as to be fit in the capacity of one face of the instruction cache 1-2, and each program pieces has program-structure in which the execution can be completed within the program piece. COPYRIGHT: (C)2005,JPO&NCIPI
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