When designing a board, it is important to consider which interfaces and pins will assist with debug capability beyond configuration. For example, AMD recommends that you ensure the JTAG interface is accessible even when the interface is not the primary configuration mode. The JTAG interface allows you to check the device ID, check the device DNA information, and read key status registers for debug. You can also use the interface to enable indirect flash programming solutions during prototyping.
In addition, signals such as the INIT_B and DONE are critical for device configuration debug. The INIT_B signal has multiple functions. It indicates completion of initialization at power-up and can indicate when a CRC error is encountered. AMD recommends that you connect the INIT_B and DONE signals to light-emitting diodes (LEDs) using LED drivers and pull-ups.
For recommended pull-up values, see the configuration user guide for your device:
- 7 Series FPGAs Configuration User Guide (UG470)
- UltraScale Architecture Configuration User Guide (UG570)
To identify and check recommended board-level pin connections, see the schematic checklists: