Эта строчка находится тут:
AVR Studio 4.18 Service Pack 1
Atmel AVR Tools ->AVR Dragon User Guide->On-Chip Debugging->Physical Interfaces->PDI Physical
Цитата
PDI Physical
The Program and Debug Interface (PDI) is an Atmel proprietary interface for external programming and on-chip debugging of a device. PDI Physical is a 2-pin interface providing a bi-directional half-duplex synchronous communication with the target device.
When designing an application PCB which includes an AVR with the PDI interface, the pinout shown in Figure 4.4, “PDI header pinout” should be used. The 6-pin adapter provided with the AVR Dragon kit can then be used to connect the AVR Dragon probe to the application PCB.
И встречается еще в трех местах - можете поискать (Search) ее по хелпу
Как я понял, подключение такое
JTAG PDI
Rst -> CLK
TDI -> DATA
GND -> GND
VTG -> VTG
Сообщение отредактировал BSVi - Dec 14 2009, 17:26