Nvidia Tegra 250 Reference manual

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January 2010
NVIDIA Tegra 250 Developer Kit
Hardware Introduction and Setup
Ver ion 100113.01

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Contents
INTRODUCTION 3
GETTING STARTED: OVERVIEW 4
UNBOXING 5
HOST PC CONFIGURATION 9
CONNECTING THE DEVKIT HW 9
“FLASHING” INSTALLING) OPERATING SYSTEM IMAGES ONTO THE DEVKIT 12
USING YOUR BOOTED DEVKIT 18
CONNECTING THE MINI SATELLITE BOARD 19

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Introduction
This manual describes the basic, initial setup of an NVIDIA Tegra 250 developer kit devkit),
and is designed to assist a new user in understanding the hardware, selecting an operating
system to install to the devkit, and connect and configure the hardware to boot that operating
system. Very little operating system-specific information will be found in this manual, as each
operating system supported by the Tegra 250 devkit includes its own support pack with
software and documentation. This manual covers the details that tend to cross over all
supported operating systems.
What is “The Devkit”?
The NVIDIA Tegra 250-based devkit is a compact, Smartbook-motherboard form factor
computer-on-a-board with the following specifications:
-Dual ARM Cortex A9 CPU @1GHz
-1GB of RAM
-High-performance, shader-based 3D acceleration
-HD video encode and decode
-512MB of Flash memory
-Onboard wired Ethernet
-WiFi
-Bluetooth
-Analog stereo audio in/out
-USB keyboard/mouse/storage support
-HDMI/DVI-D and VGA/CRT display support
-Onboard SD HC) slot

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Getting Started: Overview
There are a few basic steps required to begin developing for the devkit:
Unboxing:
1) Unpack the devkit components
2) Familiarize yourself with the components
Host PC Configuration:
1) Select your desired devkit operating system
2) Download the support pack for that operating system from the NVIDIA Tegra
developers website
3) Read the documentation provided with that support pack and install it to the
appropriate host PC
4) Download and install any host PC support SW as required by the platform support
pack’s documentation
Connecting the Devkit HW:
1) Locate/procure the required hardware accessories for the devkit somewhat dependent
upon the selected devkit operating system image)
2) Select the desired video output based on your available display devices and the
operating system image
Installing the Operating Syste to the Devkit:
1) Follow the operating system image installation instructions provided with the support
pack
2) Boot the devkit

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Unbo ing
Devkit Contents and Hardware Requirements
As shipped, your devkit should contain the following items:
•Devkit main board rectangular circuit board containing the Tegra chip and connectors
for networking, USB peripherals, storage and display devices)
•15V power adapter USA 120V mains power connection)
•Adjustable, folding, threaded WiFi antenna
•Expansion board smaller, square circuit board containing a serial port, LEDs and a few
buttons)
Also required to use the devkit, but not supplied developer must provide these):
•Host PC with USB ports. The exact OS that this host PC must be running may differ
depending upon the devkit OS to be used, but is most frequently Microsoft Windows.
•USB mini NOT micro, as with previous Tegra devkits) to USB cable for device setup
and connectivity)
•External display supporting VGA 15-pin D-Sub), HDMI or DVI via HDMI-to-DVI
adapter)
•SD card or USB-based “thumb drive” for additional storage
•USB mouse
•USB keyboard
Strongly recommended to use the devkit, but not supplied developer should provide these):
•Powered USB hub

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Getting Familiar with the Devkit
Main Board
The following diagram shows a Tegra 250 devkit main board with power connected. Important
connectors are annotated:
The annotated items include:
•15V Power jack. Supplies the main power to the devkit the devkit as shipped to
developers does not directly support battery power)
•VGA (CRT) jack. Support for 15-pin D-Sub analog display output
•HDMI jack. Support for digital display output
•WiFi antenna jack. Connection point for supplied or 3
rd
-party) WiFi antenna
•Tegra 250 chip. The heart and soul of the Tegra 250 devkit
“ACOK”
configuration switch
Power
LEDs
Tegra chip
WiFi Antenna
jack
15V power
jack
HDMI
jack
Expansion board
connectors
Reset
button
Recovery
button
Power
button
USB-A
jack
VGA
CRT) jack
Microphone
jack
Headphone
jack
SD Card
slot
Ethernet
jack
Dual USB-
A jacks
USB mini
jack

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•USB-A jacks (3). Support for common peripherals use of a powered USB hub is
strongly recommended)
•Expansion board connectors. “Header” connections for an expansion board supplied)
that adds status LEDs, copies of the power, reset and recovery buttons, and a serial port.
•“ACOK” configuration switch. A configuration micro-switch that is used to adjust the
power behavior of the devkit. In the left BATT) position, the AC adapter simulates a
battery, and the soft power button functions normally. In the right NORM) position,
applying power causes the device to turn on, without pressing the power button. The
left BATT) position is preferred for developers.
•Power button. Pressing this switch will toggle the power to the device on and off
•Recovery (flashing) button. Used to place the devkit in a special mode that leaves it
ready to receive a new operating system image via USB “recovery” mode)
•Reset button. Soft reset
•Microphone jack. Stereo microphone input as a 1/8” phone jack
•Headphone jack. Stereo headphone output as a 1/8” phone jack
•Ethernet jack. Wired networking if supported by the OS
•SD card slot. Supports normal and high-capacity SD card storage
•USB- ini jack. USB jack for flashing the device updating OS images) and connecting
the device to a host PC.

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Mini Satellite Board
In addition, most Tegra 250 devkits include the “mini satellite board”, which replicates the main
power, reset and recovery buttons, adds a UART serial port for low-level debugging on some
OSes, and switches and LEDs for common “smartbook” features like lid close, wifi on/off, etc.
An appendix at the end of this document provides connection instructions. The board is
pictured below:
•UART serial port. Standard serial port for use with some OS images for low-level
logging and debugging
•Power, reset, recovery buttons. Replicated from the main board so that all controls may
be found on the satellite board. Useful if the main board is somehow packaged
•Si ulated lid switch. On some OS images, setting this switch causes the device to sleep
•Dual ribbon cables. Connection to the main board
•Wifi, BT, etc status LEDs. Provides activity status of major peripherals
•WiFi switch. Enables/disables WiFi radio
Simulated lid
switch
WiFi switch
Power, reset,
recovery
buttons
Wifi, BT, etc
status LEDs
Dual ribbon
cables to
main board
UART
serial port

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Host PC Configuration
Selecting and Downloading a Platform Support Pack
Currently, there are several packs available for use with the devkit, including OS support packs
and sample application SDKs. An OS support pack must be installed or “flashed”) to the
devkit in order to boot it and use it. The set of supported packs include:
•An Android Éclair OS support pack. This includes scripts to install the Android OS
image and associated “getting started” documentation.
•A Windows CE 6.0 OS support pack. This includes a script to install the CE 6.0
operating system image onto a recovery-mode devkit as well as Khronos headers and
libraries to allow developers to use Microsoft Visual Studio 2005 and 2008 to develop
and debug applications on Tegra using OpenGL ES, OpenMAX, OpenKODE, etc.
•An Ubuntu-based Linux OS support pack.
These and other packs may be found on the Tegra developers’ website. Developers should
select the target operating system that best matches their intended market, feature set and
development environment requirements, as each of these operating systems differ significantly
on all of these fronts. The developer website information for each OS support pack can assist in
the decision. However, OS images may be re-flashed to the devkit at will, so a single devkit can
change between operating systems in minutes.
Download the desired platform support pack for the OS you wish to use. At this point, you
should transition away from this documentation temporarily and into the documentation
supplied with the selected OS image. That documentation will, as needed, provide pointers
back to this manual when it is time to connect and “flash” the device. Ensure that all of the
selected OS image’s host PC prerequisites are satisfied by your selected host PC before
continuing.
Connecting the Devkit HW
While use-cases will differ, there are a few basic items that must be connected to the devkit to
install an operating system and boot the device. Items common to all operating systems are
included in this documentation. Additional items such as serial connections, network
connections, and storage devices may be required to install and boot some operating systems.
These will be documented along with the particular operating system. The common
requirements include:

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1) Display connection. One of the following display devices should be connected. For
best results, do not connect more than one of these options at a time unless directed to
do so by a particular operating system pack. Be sure to check the documentation for
your selected OS support pack, as some OSes may not support all of these display
connections:
a. Analog “VGA” display LCD or CRT monitor) connected via the devkit’s VGA
15-pin D-sub connector.
b. HDMI display LCD screen or compatible television) via the devkit’s HDMI port
and an HDMI cable. Note that on many OS images, using HDMI as the display
connection will route audio to the HDMI port as well, disabling the headphone
jack.
c. Digital DVI-D display connected via the devkit’s HDMI port and an HDMI-to-
DVI cable or cable-adapter pair.
2) “Recovery” (or flashing) USB connection. A USB cable must connect the USB-mini jack
on the left-rear corner of the devkit to a USB jack on the host PC. The OS that the host
PC must be running will depend on the OS being installed on the devkit, and will be
documented in the platform pack for that particular OS.
3) Power. The supplied 15V power supply should be connected to the power jack on the
rear edge of the devkit main board. Depending on the setting of the “ACOK” switch
described previously, applying power to the board may cause it to switch on
automatically. Earlier Tegra devkits used a 12V power supply with a similar connector:
this 12V power supply is not compatible with the Tegra 250 devkit and must not be
used.
Additional items that should be connected to the devkit for general post-install interaction with
the devkit include
1) Powered USB hub. As a mobile development kit, the devkit is not designed to provide
large amounts of power to external devices. Thus, external devices other than the most
basic mice and keyboards should be connected to a powered USB hub. This powered
hub should be connected to one of the two stacked USB jacks on the left-front edge of
the devkit main board.
2) USB keyboard and ouse: both of these should be connected to the powered USB hub.
If required, a basic USB keyboard and mouse pair can be connected to the two stacked
USB jacks, but if possible, a powered hub is recommended.
3) WiFi Antenna. The threaded end of the WiFi antenna should be firmly screwed onto
the WiFi antenna connector on the rear edge of the devkit main board.