| 摘要 |
<p>A computer system has a multi-tiered bus system. The multi-tiered bus system includes one or more local buses (20,25) and a central bus (10) connected to each local bus (20) by a bus interface (11). In order to maintain one global view of transaction ordering, the processors (21, 22) on each local bus (20) record bus transactions in an order on which the bus transactions appear on the central bus (10). To do this, bus transactions which are initiated on any local bus (20) are forwarded to the central bus (10) by the corresponding bus interface (11). The processors (21, 22) connected to the local bus (20) do not record bus transactions when they are initiated on the local bus (20). Every transaction which occurs on the central bus (10) is echoed back to every local bus (20) by the corresponding bus interface (11). Each processor (21, 22) records bus transactions at the time they are echoed back to the local bus (20). <IMAGE></p> |
