求教：pci9054databook中的一句话.

When the PCI 9054 acknowledges BREQi assertion during DMA or PCI Target Write transfers, it releases the Local Bus within two Lword transfers by de-asserting LHOLD and floating the Local Bus outputs if either of the following conditions exist:
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？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？

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