DKC03.2-100-7-FW
所有数字定时连接均参考DGND。此参考是
如图4-4所示，该图显示了如何连接外部PFI0
电源和外部PFI2电源连接至两个6711/6713设备PFI引脚。
图4-4：。定时输入/输出连接
可编程功能输入连接
共有七个内部定时信号，您可以从外部
通过PFI引脚进行控制。每个信号的源是
需要外部控制时，可从任何PFI中选择软件。
这种灵活的路由方案减少了更改物理
连接至设备输入/输出连接器，以满足不同应用的需要
备用接线。
您可以单独启用六个PFI引脚以输出特定的内部
正时信号。例如，如果需要更新*信号作为输出
在输入/输出连接器上，软件可以打开
PFI5/更新*引脚。当PFI信号
配置为输出。

All digital timing connections are referenced to DGND. This reference is demonstrated in Figure 4-4, which shows how to connect an external PFI0 source and an external PFI2 source to two 6711/6713 device PFI pins. Figure 4-4. Timing I/O Connections Programmable Function Input Connections There are a total of seven internal timing signals that you can externally control from the PFI pins. The source for each of these signals is software-selectable from any of the PFIs when you want external control. This flexible routing scheme reduces the need to change the physical wiring to the device I/O connector for different applications requiring alternative wiring. You can individually enable six of the PFI pins to output a specific internal timing signal. For example, if you need the UPDATE* signal as an output on the I/O connector, software can turn on the output driver for the PFI5/UPDATE* pin. Be careful not to drive a PFI signal externally when it is configured as an output.