| 摘要 |
An electronic bridging device for transferring electronic data between a first device attached to a system bus and a peripheral device attached to a peripheral bus using a bridging circuit. The DMA controller comprises a system bus interface circuit for connecting the DMA controller to the system bus, a peripheral bus interface circuit for connecting the DMA controller to the peripheral bus, a data transfer request circuit for receiving data transfer requests from devices attached to the peripheral bus, and a control logic circuit for controlling the operation of DMA data transfer operations. Immediately upon receipt of one or more data transfer requests, the bridging device performs the following operations: requests access to the system bus, concatenates all pending peripheral bus data words into a single transfer, and transfers all pending requests across the bridging circuit.
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