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51. 发明授权

US6105080A Host adapter DMA controller with automated host reply capability 失效
标题翻译：主机适配器DMA控制器，具有自动主机回复功能
公开(公告)号：US6105080A
公开(公告)日：2000-08-15
申请号：US681
申请日：1997-12-30
申请人： Keith W. Holt , Bret S. Weber
发明人： Keith W. Holt , Bret S. Weber
IPC分类号： G06F13/28
CPC分类号： G06F13/28
摘要： A DMA controller operable within a host adapter which automatically transmits replies to an attached host system to thereby reduce overhead processing in the I/O processor of the host adapter. The DMA controller is preferably operable to perform DMA transfers in accordance with one or more scatter/gather lists descriptive of the desired data transfer. A flag bit associated with and/or contained in entries of the scatter/gather list signifies the need to transmit a reply message to the host system. The requisite reply message is transmitted to the host system by the DMA controller following the DMA transfer of the block defined by the scatter/gather list entry containing the indicator. The reply message content is determined in accordance with information associated with and/or contained in the subsequent entry of the scatter/gather list. The subsequent scatter/gather list entry includes a reference to the reply message content and a reference to the destination location to which the reply is transmitted. In the preferred embodiment, the host adapter is operable in accordance with the industry standard I2O specifications. A reply message is transmitted to the I2O compatible host system interface via I2O defined outbound queues and context structures defined in the subsequent scatter/gather list. In addition, the reply message may be either static and predefined or dynamically generated by the DMA controller. Further, the destination for the reply message may be either statically encoded in the scatter/gather list entry or may be dynamically obtained from the context structures by the DMA controller.
摘要翻译：可在主机适配器内操作的DMA控制器，其自动发送对所附主机系统的响应，从而减少主机适配器的I / O处理器中的开销处理。 DMA控制器优选地可操作以根据描述所需数据传输的一个或多个分散/收集列表执行DMA传输。与分散/收集列表的条目相关联和/或包含的标志位表示需要向主机系统发送回复消息。在由包含指示符的分散/收集列表条目定义的块的DMA传输之后，DMA控制器将必要的应答消息发送到主机系统。答复消息内容根据与散列/收集列表的后续条目相关联和/或包含在其中的信息来确定。随后的分散/收集列表条目包括对回复消息内容的引用以及对发送回应的目的地位置的引用。在优选实施例中，主机适配器可根据工业标准I2O规范进行操作。答复消息通过I2O定义的出站队列和后续分散/收集列表中定义的上下文结构传输到I2O兼容的主机系统接口。另外，应答消息可以是静态的，也可以由DMA控制器预先定义或动态生成。此外，答复消息的目的地可以在分散/收集列表条目中静态地编码，或者可以由DMA控制器从上下文结构动态地获得。

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