| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a mechanism for interrupting access to an unauthorized address from a bus master device connected to a system bus of a processor with smaller circuit size. <P>SOLUTION: According to a system bus type, an unauthorized address access interruption mechanism is inserted in an address line and a control line between a bus master device and a bus, or in a control circuit part of the bus. The unauthorized address access interruption mechanism includes a register for setting an address range permitting the access. Whether an address output to the address line is within this range is determined by a comparator. When the address is out of the range, the output of the control line is suppressed, whereby the unauthorized address access is interrupted. <P>COPYRIGHT: (C)2013,JPO&INPIT |
