Configure NIOS firmware burning interface

Additional info.

When you don’t need to export JTAG pins:

• Standard Nios II and JTAG UART flow: If you are using the Nios II processor along with the JTAG UART IP (used for communication between the host and the processor), you don’t need to export physical JTAG pins.

• The JTAG interface (TCK/TDI/TDO/TMS) is already available and accessed directly through the FPGA’s built-in JTAG port, which is already on your development board.

• Toolchain like Quartus and the programmer tool automatically uses these JTAG ports without requiring you to manually export them.

Examples of when no export is needed:

• Using Nios II Debug Interface with JTAG UART in your Platform Designer.

• Working with the built-in JTAG interface for debugging and programming.

When you need to export JTAG pins:

• Custom or special JTAG interface: If you are designing a custom JTAG interface (for instance, creating your own soft JTAG in your IP), then you will need to manually export the JTAG-related pins.

• If your design requires a unique or non-standard JTAG setup (outside the typical Nios II + JTAG UART setup), this will require exporting the JTAG pins from Platform Designer.

Examples of when export is needed:

• Designing your own custom JTAG interface.

• Implementing a soft JTAG in your IP that requires dedicated pins for TDI, TDO, TMS, and TCK.