DIO

General Purpose high speed I/O

Can be used for quasi static control signals or digital communication such as I2C or SPI

In order to activate the terminal as input or output, the drivers on the NI sbRIO9651 and on the target board have to be set accordingly.
The driver on the NI sbRIO9651 can be set in the FPGA code by setting the enable signal (true = output) with an FPGA I/O Node. The driver on the target board can be set (true = output) via a separate FPGA pin.

On the ZSOM-Mini Tagret GPIOs ENVP ENDIO and DIOLEVEL have to be set to enable the DIO funtionality.

Use the vis in the getting started example to initialize all in one go:

Although the pins are all configured as input at startup, it is best practice, to set the direction of the pins in the FPGA code.
Use the vis in the getting started example to initialize all in one go:

For some applications such as two wire interface etc. it is necessary to switch the direction of a pin at run time.
The init_io VIs in the getting started example can be used to initialize the pins accordingly.
The VI returns three FPGA I/O references to DIO_1_in , DIO_1_out and DIO_1_dir. These references can be used with FPGA I/O nodes to set and read the logic level and enable the output on the terminal.

Since the FPGA code per default runs at 40Mhz. Output frequencies > 20Mhz are not possible in the default clock domain.
You can run code inside of single cycle timed loops on faster clock rates.

One FPGA IO can only be used in one clock domain. This can be acheived in the following way: