Pin-header X1 has 96 contacts in 2.54 mm (0,1 inch) grid pitch. It can be used to assemble DIN 41612 standard (IEC/EN 60603-2) connectors. The grid is organized in three rows (row a, b and c) with 32 contacts each. The pin assignment of this connector is described in Appendix D, PortuxG20 Pin Assignment.

In the default state no connector is assembled at all on the PortuxG20 to allow flexible use of the pins for the customer. The AT91SAM9G20's USARTs are organized in four ten-way connectors which can be assembled alternatively. They are named IF0, IF1, IF4 and IF5 and correspond to the AT91SAM9G20's USART0, 1,4 and 5 respectively. Samples for both connectors are contained in the Starterkit.

All levels of USARTs on X1 are low-level TTL (3.3V). In the following pin assignments, pins driven by the hardware IP of the AT91SAM9G20 are coloured. If further signals are needed they must be programmed individually by the user.

RJ45 jack for 10/100 MBit/s ethernet.

Mini spring-clamp connection for 5V regulated DC-IN.

	Warning
	Do not connect voltages above the specified 5V to the board. Overvoltage can result in damages beyond repair.

Pin-header X4 is an alternative assembling for the DSUB serial connector X6. Levels are RS232.

Four wire Micro SD-Card slot.

Pin-header X6 is a DSUB-connector in RS232 levels. It corresponds to USART2 of the AT91SAM9G20. On the original signals DSR and DTR is the AT91SAM9G20's debug serial port (DBGU). An adapter is needed (DBGU-Adapter) to connect to the DBGU. The adapter is part of the Starterkit contents. Schematics to build one can be found in Appendix E, Schematics DBGU Adaptor. With Jumper 6 (not assembled by default) RI can be powered by VCC 3.3V.

Full speed USB device port.

16-way connector in 2.54 mm pitch grid. It allows access to the JTAG-Unit of the AT91SAM9G20. J16, J15 and J13 are not assembled.

Two full speed USB host ports.

Battery holder for CR 2032 battery for RTC backup.

GND test pins