| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To attain an efficient operation following a bus clock from a clock generation output control means of a host system without requiring a mechanism for generating a special clock for an operation. <P>SOLUTION: An IO processing device 10 is connected with the host system 30 via a bus 20. The IO processing device 10 includes an IO processor 12 which is started by a starting request signal and operates by a clock generated by the bus clock BCLK and a bus clock control signal output control part 141. A clock generation output control part 31 of the host system 30 notifies the control part 141 of invalidation notice when the bus 20 is not used exceeding fixed time at a valid output state where an output operation of the bus clock BCLK is valid. The control part 141 requests continuation of the valid output state to a control part 31 within the fixed time if starting is requested by the starting request signal or the IO processor 12 is under operation when the invalidation notice is detected. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
