求教：pci9054databook中的一句话，谢谢

When the PCI 9054 acknowledges BREQi assertion during DMA or PCI Target Write tr
ansfers, it releases the Local Bus within two Lword transfers by de-asserting LH
OLD and floating the Local Bus outputs if either of the following conditions exi
st:
1.BREQi is asserted and enabled
2.Gating is enabled and the Local Bus Latency Timer
  is enabled and expires (MARBR[27, 7:0])
 
请问it releases the Local Bus within two Lword transfers 指的是什么？是什么动作
啊？
 
前面说pci9054检测到BREQi有效后，就释放局部总线，后面的条件又指的是什么？多谢

不明白的说，two Lword transfers 是否就是指两个Lword的传输时间，这个传输时间怎么确定的啊？

如何与你联系？
9054在传输完2个数据后，释放总线，

QQ:77025251

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