| 摘要 |
PROBLEM TO BE SOLVED: To provide a priority control system by which complicated priority order control can be made without impairing real-time performance in a common bus mediation device of a control device in which real-time performance is required. SOLUTION: The priority order control system 13 which controls the priority order of access to a bus slave device 12 from a plurality of bus master devices 110-112 connected to at least one bus slave device 12 via a common bus 10, is provided with a first priority order control means 20 which simply speed up priority order control processing, a second priority order control means which controls complicated priorities, and gate means 220-222 which perform ON/OFF control the requests for access to the first priority order control means 20 based on the output result of the second priority order control means 21. Complicated priority order control can be made by the priority order control means 21 in parallel, while implementing priority order control of a low latency by the priority order control means 20. COPYRIGHT: (C)2003,JPO
|
