| 摘要 |
The present invention is a direct access bridge for translating messages between a first protocol and a second protocol via a first component interface and a second component interface. The first and second component interfaces are adapted to respectively couple to a first and second protocol bus. The first component interface is also coupled to the second component interface. The first component interface is further adapted to transmit and receive data and fundamental message information to and from a first component via the first protocol bus using the first protocol. The second component interface transmits and receives the data and the fundamental message information to and from the second protocol bus in accordance with the second protocol. Similarly, the second component interface and the first component interface transform the data and fundamental message information from the first protocol to the second protocol and vice versa between the first and second bus. The fundamental message information from the second protocol bus to the first protocol bus; and the fundamental message information is provided to a memory coupled to the second protocol bus such that the first component has direct access to the memory. For example, in one embodiment of the present invention a direct access bridge system and method enables a PCI master component to perform a direct memory access read and write of information to a memory associated with an Hitachi SH4 microprocessor using the DDT protocol.
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