| 摘要 |
The bus system includes a plurality of masters, a plurality of slaves, and a multilayer switch. The bus system further includes an access control register to which access control information is set by a predetermined secure master. The multilayer switch includes switch master portions and switch slave portions. When a master accesses a slave, a switch master portion corresponding to a master different from the secure master determines whether the access is made to an access control area based on address information of an access destination and access control information stored in the access control register. If the switch master portion determines that the access is made to the access control area, it inhibits the access.
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