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PROCEDURES AND ADJUSTMENTS FOR THE CONTENT OF TRANSACTION SUPPORT AND FOR THE SUPPORT OF INCREASED ANSWERS IN A BUDGET
PROCEDURES AND ADJUSTMENTS FOR THE CONTENT OF TRANSACTION SUPPORT AND FOR THE SUPPORT OF INCREASED ANSWERS IN A BUDGET
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机译:预算中有关交易支持和增加答复的程序和调整
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摘要
A bus bridge situated between two buses includes two queues: an outbound request queue and an inbound request queue. Requests originating on the first bus which target a destination on the second bus are placed into the outbound request queue. Decoding circuitry within the bridge issues a deferred response if the request can be deferred. This deferred response is returned to the originating agent on the first bus, thereby informing the originating agent that the request will be serviced at a later time. Bus control circuitry coupled to the outbound request queue removes requests from the outbound request queue and executes them on the second bus. The bus control circuitry receives a response from the destination agent on the second bus in response to the execution of the outbound request. This response is returned to the originating agent either immediately or after passing through an inbound request queue. Both the outbound request queue and the inbound request queue have data buffers associated therewith for transferring data between the two buses. In addition, requests may originate on the second bus which target a device on the first bus (i.e., inbound requests). These inbound requests are placed in the inbound request queue and are executed on the first bus when removed from the inbound request queue.
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