| 摘要 |
PURPOSE:To increase processing performance by eliminating the time of an ineffective scan by selecting a circuit group with the highest priority level among respective groups during a circuit scan by dividing circuits, differing in communication rate, into groups and by previously storing the top priority processing circuit number for requests for processing. CONSTITUTION:Circuit coordinating circuits 21 of circuits differing in communication rate are divided into the 1st-(n)-th groups; and storage 10 for a table is provided previously with areas for the 1st group the (n)-th group and in each area, an in-group circuit number, priority level specifying information, in-group circuit number effective specifying information, and final-group specifying information are inputted from signal line 16 and stored. During a scan, a request-for-processing signal from each group is applied to address register 11 for the table via request-for- processing signal line 18 and on the basis of its address, access to storage 10 is attained to select the in-group top-priority circuit in every group by utilizing buffer register 14 for comparison. Further, the top-priority circuits in respective groups are compared mutually to select single circuit 21 with the highest priority level, thereby increasing the processing performance. |
