10.3.1 Atmel AVR XMEGA OCD Specific Issues

For the ATxmegaA1 family, only revision G or later is supported

PDI might not work at certain frequencies if there is much undershoot on the PDI clock signal. On some target board configurations the PDI clock has shown a fair amount of undershoot. This undershoot might result in the Atmel JTAGICE3 not being able to communicate with the target. To get around this problem the PDI clock frequency should be lowered. This can be done on the Interface settings tab in the programming dialog or on the Tool tab in the project Properties of a debug project. If a higher PDI clock frequency is required some kind of termination must be added to the PDI clock line. For example adding a small capacitor (in the order of 100pF) on the target board between the PDI clock and V_CC has proven to be effective. Adding a series resistor is not effective unless it is added to the JTAGICE3 main board.