| 摘要 |
PROBLEM TO BE SOLVED: To provide a bus division system that enables bus division for maintaining high speed operating performance in circuit operation in a high function and high performance large-scale LSI and in a circuit board of electronic equipment, with simplicity and quickness and even after the manufacture of the LSI and circuit board. SOLUTION: Bus units DB and DB1A to DB1B interconnect a CPU 7 and first to fifth peripheral circuit blocks 11 to 15. The bus units DB and DB1A to DB6B comprise switch circuits 1 to 6. A switch control part 8 controls the switch circuits 1 to 6 to select the shortest routes R1 to R5 out of bus routes in two clockwise and counterclockwise directions. The establishing operation of the high-speed shortest routes R1 to R5 can save optimization by repeated logic designs and layout designs to offer simplicity, quickness, and flexible accommodation to a specification change and the like.
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