| 摘要 |
PURPOSE:To attain freely the alternation of an address specfication range for each peripheral device by installing a mapping table and converting a transfer address into a physical address according to the address conversion information in the table to transfer directly data. CONSTITUTION:A combining means 40 connecting the 1st and 2nd buses includes mapping tables 80 and 90 for address conversion. When a CPU10 or 20 feeds instructions of direct data transfer between peripheral control means 50-70 and memory means 30; the CPU10 or 20 writes address conversion information in the mapping table 80 or 90, and sends the number of transfered data and the start address including peripheral control means identification information and specification information which specifies the mapping table. Upon direct data transfer, the CPU10 or 20 converts a transfer address into a phsical address according to address conversion information in the mapping tables 80 and 90 to transfer to the 1st bus. This address allows direct data transfer. |
