Placing a Digital IO Module

The configurable Digital I/O Module provides an efficient and uncomplicated means by which to monitor/generate digital signals in a design. Figure 1 shows a simple example of how the device is wired into an FPGA design.

Figure 1. Using a Digital I/O module to monitor and control areas of a design.

In the example circuit above, the DIGITAL_IO device has been configured with two inputs and two outputs. The use of these signals can be summarized as follows:

• The 16-bit input signal Count is used to monitor the output from a 16-bit cascadable binary counter.

• The 8-bit output signal LedCtrl is connected to the User LEDs on the Desktop NanoBoard NB2DSK01.

• The 16-bit output signal Ctrl is directly connected to the 16-bit input signal CtrlCopy. Whatever is set on the output side will be fed back and displayed on the input side.