<p><font face="Verdana">ieee 1394火线
接口标准协议</font><br/></p>
<p><font face="Verdana">The 1394 Open Host Controller Inte
RFace (Open HCI) is an implementa
tion of the link layer protocol of the 1394 Serial<br/>Bus, with additional features to support the t
ransaction and bus management layers. The 1394 Open HCI also includes<br/>DMA engines for high-performance data transfer and a host bus interface.<br/>IEEE 1394 (and the 1394 Open HCI) supports two types of data transfer: asynchronous and isochronous. Asynchronous<br/>data transfer puts the emphasis on guaranteed delivery of data, with less emphasis on guaranteed timing. Isochronous data<br/>transfer is the opposite, with the emphasis on the guaranteed timing of the data, and less emphasis on delivery.</font></p><br/>
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