承接上回,笔者将继续介绍传统PCI接口的技术。PCI接口上的数据发送,依据来去方向的差异,有读出(Read)与写入(Write)的分别。无论是读出也好、写入也好,两者皆有其对应时间序列的关系图。写入周期先从写入周期(Write Cycle)来说起。请参阅图1,图标中一对箭号标示代表驱动该信号管理者的切换。在第一个管理者停止信号的驱动,到下一个别的管理者要驱动该信号之间,至少要等待一个时钟脉 To undertake the last time, I will continue to introduce the traditional PCI interface technology. PCI interface on the data sent, depending on the direction of the difference between read (Read) and Write (Write) respectively. Either read or write, Ye Hao, both have their corresponding time series diagram. The write cycle starts with the Write Cycle. Please refer to FIG. 1, a pair of arrow marks in the icons represent the switches that drive the signal manager. Wait for at least one clock pulse between the first manager stopping the signal and the next manager going to drive the signal