| 摘要 |
PROBLEM TO BE SOLVED: To provide a system bus controller capable of effectively utilizing a system bus as much as possible and efficiently transferring data. SOLUTION: The system bus controller includes; the system bus being a path of data transferred from a bus master; a bus condition monitor part for monitoring a busy or idle state of the system bus; a bus assignment part for assigning a bus width permitted for transfer to the bus master on the basis of the busy or idle state of the system bus monitored by the bus condition monitor part, in response to a transfer request from the bus master; and a bus width varying part for varying a bus width for data transfer of the bus master in accordance with the assigned bus width. Since the bus width for data transfer is varied in accordance with the bus width permitted for use, the transfer request is not made to wait. COPYRIGHT: (C)2007,JPO&INPIT
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