User manual

AT91SAM9G20-EK Evaluation Board User Guide 4-1

6413C–ATARM–18-Feb-09

Section 4

Configuration

4.1 Jumpers

Note: 1. These jumpers are provided for power consumption measurement. By default, they are closed. To use

this feature, the user has to open the strap and insert an ampere meter.

Table 4-1. Jumpers Configuration

Designation Default Setting Feature

J2 Closed 3.3V Jumper

(1)

J3 Closed

Forces power on. To use the software shutdown control:

• J3 must be opened,

• 3V battery backup must be present,

• J10 jumper set in position 1-2

J6 Closed VDDPLL Jumper

(1)

Open Enables boot on the internal ROM

Closed Enables boot on the NCS0

J9 2-3

Slow Clock OSCSEL

1-2: Internal RC Oscillator

2-3: External Crystal Oscillator

J10 2-3

VDDBU Jumper select

(1)

1-2: Lithium 3V Battery

2-3: 1.0V from VDDCORE

J12 Closed VDDCORE Jumper

(1)

J15 Closed Enables Ethernet Auto MDIX control

J33 Closed Serial DataFlash chip select enable

J34 Closed NAND Flash chip select enable