AXEL ULite SOM/AXEL ULite Evaluation Kit/pdf

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Getting started[edit | edit source]

Kit Identification Codes[edit | edit source]

The development kits (DESK, XELK, XUELK, BELK, etc.) are identified by a couple of codes:

  1. P/N Part Number identification code
  2. S/N Serial Number identification code

These codes are printed on a label sticked to the box containing the kit.

For example, the following picture shows such a label of an Axel Ultra XELK (XELK-H-S) with Serial Number 0CFA

Label of Axel Ultra XELK (XELK-H-S)

These codes are required to complete the registration process of the kit.



Unboxing[edit | edit source]

Once you've received the kit, please open the box and check the kit contents with the packing list included in the box, using the table on this chapter as a reference.

The hardware components (SOM, carrier boards and display) are pre-assembled, as shown in the picture below:


AXEL Lite-EVK-kit-unboxing.png

Kit Contents[edit | edit source]

The following table list the kit components:

Component Description
SDV04-UL-C1R.jpg
SDV04 with AXEL ULite SOM
AXEL Lite-EVK-kit-display.png
Ampire AM-800480SETMQW
7” 800x480 LCD display
LVDS interface
AXEL Lite-EVK-kit-quick-start-guide.png
Quick Start Guide
AXEL Lite-EVK-kit-power-supply.png
AC/DC Single Output Wall Mount adapter
Output: +12V – 2.0 A
AXEL Lite-EVK-kit-serial-cable.png
DB9 Male Serial port adapter
AXEL Lite-EVK-kit-sdcard.png
MicroSDHC card with SD adapter and USB adapter

microSD Layout[edit | edit source]

The microSD provided with the kit is used to store:

  • a bootable partition (mmcblk0p1, vfat) containing:
    • binary images (u-boot and kernel images)
    • documentation
    • DVDK virtual machine image
  • root file system partition (mmcblk0p2, ext3)


Connections[edit | edit source]

This section describes how to quick start the Evaluation Kit. The picture below shows the AXEL ULite SOM inserted into the Evaluation Kit:

SDV04-UL-C1R.jpg

The system is programmed to automatically boot Linux at power up, loading the bootloader, the kernel and device tree image and the root file system from the SD card memory.

To connect to the system:

  • connect the 12Vcc power supply to J16 on the board
  • connect the DB9 adapter bracket to the J8 connector on the SBCX and connect the DB9 connector to the PC COM port through a NULL-modem cable (not provided)
    • start your favorite terminal emulator software on PC (eg: PuTTY, Minicom, ...); communication parameters are 115200,N,8,1
  • (optional) connect the ethernet cable from your LAN hub/switch to the J16 RJ45 connector
    • start SSH, using the following parameters:

First boot[edit | edit source]

Once power has been applied, U-Boot bootloader will be executed and the debug messages will be printed on the serial console. U-Boot automatically runs the autoboot macro, that loads the kernel/dtb and launches it with the options for mounting the root file system from the SD card.

At the end of the boot process, a demo application is launched and you can interact with the system using the touchscreen. The Linux shell is available on the serial console. Moreover, both telnet and ssh services are available to connect to the system through the network.

Serial console[edit | edit source]

A simple Windows serial and SSH/telnet client and terminal can be downloaded from here.

The following picture shows the serial setup for connecting to the EVK:


PuTTY connection using Serial Port


once selected the COM[x] serial port, click the Open button which starts the terminal. Once powered, the EVK shows the U-boot debug messages printed on the serial console.

Connecting through SSH[edit | edit source]

Once the ethernet port has been configured, the following picture shows the SSH connection to the EVK (in the following example, a 192.168.1.1. IP address is used):


PuTTY connection using SSH


once selected the IP address, click the Open button which starts the terminal. Once connected, the EVK shows the linux kernel prompt login for inserting the login:


PuTTY SSH login


Then use the root login username without password:


PuTTY SSH connected


Boot Configurations[edit | edit source]

AXEL ULite Evaluation Board is built upon i.MX6UL processor.

The following sections detail boot configuration options, which differ depending on the SoM.

Available options[edit | edit source]

Boot modes can be selected by J18 switches which acts directly on J2.20 BOOT_MODE0 configuration pin.

J18.1 switch is mapped to BOOT_MODE0 pin allowing different boot modes.

Boot options order code Jumper mounted Jumper not mounted
Boot from NOR NOR SD
Boot from NAND NAND SD

Inserting a jumper on the left position header, the internal storage device is selected as a primary boot device: i.e. NOR SPI or NAND flash.

Boot option


Reset Button[edit | edit source]

AXEL ULite Evaluation Board has a pushbutton directly connected to the PMIC_PWRON signal which drives a SOM hardware reset.

S1 is the hardware reset button.

Reset button

General Information[edit | edit source]

Product Highlights[edit | edit source]

The AXEL ULite Evaluation Kit platform presented here provides a compact solution for using the AXEL ULite SOM for evaluation purposes.

The following table summarizes the main hardware and software features available with the AXEL ULite Evaluation Kit :

Hardware[edit | edit source]

Subsystem Characteristics
SOM AXEL ULite based on NXP i.MX6UL
USB Host and device
Serial Ports RS232 interface
Ethernet 10/100Mbps
Display LVDS interface with 18bit RGB
Touchscreen (optional) capacitive
Audio (optional) Stereo OUT and MIC in (on 2x2.54mm connector)
GPIOs 5 digital input and 5 digital output (on 2x6x2.54mm connector)
RTC battery connector for external battery
PSU 12 to 24V DC
Mechanical Dimensions 87x155mm

Software[edit | edit source]

Subsystem Options
Operating System Linux
Distribution Yocto, Debian, Buildroot
Graphical Framework Qt
Applications IoT runtime


Block diagram[edit | edit source]

The following picture shows a simplified block diagram of the AXEL ULite SOM Evaluation kit.

Main functional subsystems and interfaces are depicted.

AXEL ULite Evaluation kit Block diagram


The heart of the Evaluation Kit is the AXEL ULite SOM module: please refer to the following Product Highlights page for the Evaluation Kit product highlights information.

Here below a summary for the main characteristics of the Kit.

Features Summary[edit | edit source]

Feature Specifications
Supported SOM AXEL ULite (NXP i.MX6UL SOM)
Serial Ports 1x UART RS232 on RJ-45 connector
1x UART RS232 on pin strip (debug port)
Connectivity 1x Fast Ethernet on RJ45 connector
Display 1x LVDS
Storage 1x microSD slot
USB 1x USB 2.0 Host port
1x USB OTG port
Audio (optional) TLV320AIC310 codec
Miscellaneous Capactive I2C touch controller (optional)
GPIOs
JTAG
RTC battery (external)

Electrical, Mechanical and Environmental Specifications[edit | edit source]

Electrical / Mechanicals Specifications
Supply voltage + [12 - 24] V
Dimensions 155 mm x 87 mm
Weight 106 g
Operating Temperature 0..70 °C



Interfaces and Connectors[edit | edit source]

Power Supply interface[edit | edit source]

Description[edit | edit source]

Power is provided through the J16 connector. Power voltage range is +[12-24 V].

J16 is a two pins 2x3.5mm 691321100002 Wurth connector.

Power Supply connector

Signals[edit | edit source]

The following table describes the interface signals:

Pin# Pin function Pin Notes
J16.1 DGND Ground
J16.2 VIN +[12-24 V]

Power LED[edit | edit source]

DL3 is a green LED (placed near J16) shows the status of the power input. This LED is ON when a valid power supply is present.



CPU connector interface[edit | edit source]

Description[edit | edit source]

J1 is the 204-pins SODIMM mating connector for the AXEL ULite SOM.


CPU connector


For a detailed description of the SOM pinout, please refer to the AXEL ULite SOM Hardware Manual.



JTAG interface[edit | edit source]

Description[edit | edit source]

The JTAG interface available on the Evaluation Kit at the connector JD1. By default, the connector is not populated.

JD1 is a 10x2.54mm header connector for the JTAG signals used for debug purposes togheter with a JTAG debugger.


JTAG connector

Signals[edit | edit source]

The following table describes the interface signals:

Pin# Pin name Function Notes
JD1.1 DGND - -
JD1.2 JTAG_TCK - -
JD1.3 JTAG_TMS - -
JD1.4 JTAG_TDO - -
JD1.5 JTAG_TDI - -
JD1.6 JTAG_nTRST - optionally connected (mount option)
JD1.7 CPU_PORn - optionally connected (mount option)
JD1.8 N.C. - -
JD1.9 N.C. - -
JD1.10 JTAG_VREF - 3V3 (SOM_PGOOD driven signal)


Ethernet interface[edit | edit source]

Description[edit | edit source]

J10 is a standard RJ45 connectors connected to the SOM integrated ethernet controller and PHY.


Ethernet connector

Signals[edit | edit source]

The following table describes the interface signals:

Pin# SOM Pin# Pin name Pin function Pin Notes
J10.1 J1.19 ETH0_TXRX0_P Transmit and receive pair 0 data +
J10.2 J1.21 ETH0_TXRX0_M Transmit and receive pair 0 data -
J10.3 J1.23 ETH0_TXRX1_P Transmit and receive pair 1 data +
J10.6 J1.25 ETH0_TXRX1_M Transmit and receive pair 1 data -
- J1.13 3V3_ETH_LED1 Eth link/activity led single led for link and activity

Device mapping[edit | edit source]

The network interface mapped at eth0 device in Linux.

Device usage[edit | edit source]

The peripheral is used the standard kernel interface and network protocol stack.



Console interface[edit | edit source]

Description[edit | edit source]

The Console interface available on the Evaluation Kit at the connector J8.

J8 is a 10 pin (5x2x2.54mm) header connector for the RS232 two-wires UART3 port, used for debug purposes (bootloader and operating system serial console).


Console connector

Signals[edit | edit source]

The following table describes the interface signals:

Pin# SOM Pin# Pin name Pin function Pin Notes
1,2,4,6,7,8,10 - N.A. N.C. Not connected
J8.3 J1.189 RS232_RX Receive line
J8.3 J1.187 RS232_TX Transmit line
J8.9 - DGND Ground

Device mapping[edit | edit source]

UART3 is mapped to /dev/ttymxc0 device in Linux. The peripheral is used as the default serial console, both for the bootloader and the kernel.

Device usage[edit | edit source]

To connect to the debug serial port:

  1. connect the DB9 adapter bracket to the J8 connector on the EVK board
  2. connect a serial cable between DB9 connector and PC COM port through a NULL-modem cable (not provided)
  3. start your favorite terminal emulator software on PC (eg: PuTTY); communication parameters are: 115200,N,8,1


UARTs interface[edit | edit source]

Description[edit | edit source]

An RS-232 interface is available on the AXEL ULite Evaluation Kit and mapped to the J7 is a RJ-45 standard connector.


RS232 connector


Signals[edit | edit source]

The following tables describes the interface signals

Pin# SOM Pin# Pin name Pin function Pin Notes
J7.2 J1.193 RS232 RX Receive data
J7.3 J1.191 RS232 TX Transmit Data
J7.5 - DGND Ground


Device mapping[edit | edit source]

UART3 is mapped to /dev/ttymxc2 device in Linux



micro SD interface[edit | edit source]

Description[edit | edit source]

The micro SD interface available on the Evaluation Kit at the connector J13.

J13 is a Micro-SD card header. This interface is connected to the USDHC1 controller of the i.MX6UL CPU.

micro SD connector

Signals[edit | edit source]

The following table describes the interface signals:

Pin# SOM Pin# Pin name Pin function Pin Notes
J13.1 J1.79 SD_DATA2 Data 2
J13.2 J1.81 SD_DATA3 Data 3
J13.3 J1.83 SD_CMD CMD
J13.4 - 3V3 +3.3 V
J13.5 J1.85 SD_CLK Clock
J13.6, J13.12 - DGND Ground
J13.7 J1.75 SD_DATA0 Data 0
J13.8 J1.77 SD_DATA1 Data 1
J13.9, J13.10, J13.11 - SD_SHIELD Shield
J13.13 J1.177 UART1_nRTS Card detect

Device mapping[edit | edit source]

The microSD card is mapped to /dev/mmcblk0. The available partitions are available as /dev/mmcblk0p1, /dev/mmcblk0p2, etc.

Device usage[edit | edit source]

The device can be mounted/accessed as a standard block device in Linux.



USB ports interface[edit | edit source]

Description[edit | edit source]

The AXEL ULite Evaluation Kit provides two USB ports, one Host and one Host/OTG optional ports:

  • J11 is a standard USB Host 2.0 Type A connector
USB Host connector


  • J22 is a micro-AB type receptacle for an optional USB Host/OTG connection: this interface can be mounted on request and provide an Host or an OTG USB additional port:


USB Host/OTG (optional) connector

Signals[edit | edit source]

The following table describes the interface signals


USB Host[edit | edit source]

Pin# SOM Pin# Pin name Pin function Pin Notes
J11.1 J1.188 USB_HOST_VBUS VBUS
J11.2 J1.202 USB_HOST_DN USB Host Data -
J11.3 J1.200 USB_HOST_DP USB Host Data +
J11.4 - DGND Ground

USB Host/OTG[edit | edit source]

Pin# SOM Pin# Pin name Pin function Pin Notes
J22.6, J22.7, J22.8 - USB_OTG_SH Shield
J22.1 J10.186 USB_OTG_VBUS VBUS
J22.2 J10.196 USB_OTG_DN USB OTG Data -
J22.3 J10.198 USB_OTG_DP USB OTG Data +
J22.4 J10.101 USB_OTG_ID USB OTG ID
J22.5 - GND Ground

Device mapping[edit | edit source]

The USB Host ports can be used under Linux for connecting USB peripheral devices: the related peripheral driver has to be integrated into the Linux kernel.



LVDS interface[edit | edit source]

Description[edit | edit source]

The LVDS interface available on the Evaluation Kit at the connector J20. J20 is a Hirose (cod. DF13A-20DP-1.25V) double row 1.25mm pitch miniature crimping connector

The AXEL ULite Evaluation Kit provides a 18-bit LVDS interface.


LVDS connector

Signals[edit | edit source]

The LVDS is generated, starting from the RGB i.MX6UL SOC, with a RGB-to-LVDS DS90C385A LVDS transmitter. For the RGB pin mapping, please refer to the AXEL_ULite RGB interface description.


The following tables describes the interface signals:

Pin# Pin name Pin function
1, 2 3.3V_LCD 3.3 V LCD PSU
3, 4, 7, 10,

13, 16, 19

- Ground
5 LVDS_TX0_N LVDS Data 0 -
6 LVDS_TX0_P LVDS Data 0 +
8 LVDS_TX1_N LVDS Data 1 -
9 LVDS_TX1_P LVDS Data 1 +
11 LVDS_TX2_N LVDS Data 2 -
12 LVDS_TX2_P LVDS Data 2 +
14 LVDS_CLK_N LVDS Clock -
15 LVDS_CLK_P LVDS Clock +
17 PWM backlight PWM control
18 5V backlight 5V PSU
19 GPIO 3V3 or GND (mount option, default = GND)
20 BL_EN backlight enable

Device mapping[edit | edit source]

  • LVDS is mapped to /dev/fb0 device in Linux


Touchscreen interface[edit | edit source]

Description[edit | edit source]

The Touchscreen interface is available on the AXEL ULite Evaluation Kit at the optional J5 connector.

J5 is a Molex 53398-0671 6 pin connector for connecting a I2C touchscreen controller device.


Touchscreen connector

Signals[edit | edit source]

The following table describes the interface signals:


Pin# SOM Pin# Pin name Function Notes
J5.1 - 5V or 3V3 depending on internal connection -
J5.2 J1.44 SDA I2C SDA -
J5.3 J1.42 SCL I2C SCL -
J5.4 J1.89 INT Interrupt -
J5.5 J1.128 RES Reset -
J5.6 - DGND Ground -

Device mapping[edit | edit source]

The device is typically mapped to /dev/touchscreen0 device in Linux.

Device usage[edit | edit source]

The touch controller is attached to the generic Linux input event interface (evdev).



Audio interface[edit | edit source]

Description[edit | edit source]

The optional audio interface is available on the AXEL ULite Evaluation Kit at the connector J14.

J14 is a Molex 53375-0610 header connector. The audio codec is a TLV320AIC3100 device connected to the I²S interface.

Audio connector

Signals[edit | edit source]

The following table describes the interface signals:

Pin# Codec Pin# Pin name Pin function Pin Notes
J14.1 27 HSOL Left channel Headphone/line output -
J14.2 30 HSOR Right channel Headphone/line output -
J14.3 22 SPKP Speaker + output -
J14.4 23 SPKM Speaker - output -
J14.5 11 MIC IN Microphone input -
J14.6 12 MIC BIAS Microphone bias -

Device mapping[edit | edit source]

The Audio interface is mapped to card0 ALSA device in Linux. The ALSA peripheral #0: sfczg-audio-tlv320aic3100 can be accessed via alsa-utils with hardware address 0.

Device usage[edit | edit source]

For example, it is possible to play a file using aplay -D hw:0,0 device access.




RTC interface[edit | edit source]

Description[edit | edit source]

The AXEL ULite Evaluation Kit may uses the RTC device provided by i.MX6UL's native RTC

An external lithium battery (like Panasonic ML-2020/G1AN rechargeable battery) can be optionally connected to the AXEL ULite Evaluation Kit J4 connector.

J4 is a Molex 53398-0271 PicoBlade connector


RTC connector

Signals[edit | edit source]

The following table describes the interface signals:

Pin# SOM Pin# Pin name Pin function Pin Notes
J4.1 J1.14 PMIC_LICELL RTC / VDD SNVS pin coin cell battery network has to be properly configured for lithium battery recharge current

Device mapping[edit | edit source]

RTC is mapped to /dev/rtc0 device in Linux.

Device usage[edit | edit source]

The peripheral can be accessed through the date and hwclock linux commands.



GPIOs interface[edit | edit source]

i.MX6UL can handle external pins in many different ways and most of them can be configured as GPIOs. When a pin is set as a GPIO, it is possible to read its value, change its direction or change output value directly from the shell.

Description[edit | edit source]

The GPIOs interface available on the Evaluation Kit at the connector JP1. JP1 is a 2x6x2.54mm header pinstrip connector.

GPIOs connector

Signals[edit | edit source]

The following table describes the interface signals:

Pin# SOM Pin# Pin name Pin function Pin Notes
1 - 3.3V - -
2 - DGND Ground -
3 J1.93 GPIO_IN_0 GPIO2_IO09
4 J1.107 GPIO_OUT_0 GPIO2_IO12
5 J1.95 GPIO_IN_1 GPIO2_IO08
6 J1.38 GPIO_OUT_1 GPIO1_IO00
7 J1.97 GPIO_IN_2 GPIO2_IO11
8 J1.78 GPIO_OUT_2 GPIO4_IO24
9 J1.99 GPIO_IN_3 GPIO2_IO10
10 J1.80 GPIO_OUT_3 GPIO4_IO22
11 J1.105 GPIO_IN_4 GPIO2_IO13
12 J1.179 GPIO_OUT_4 GPIO1_IO23

Device mapping[edit | edit source]

GPIOs can be used directly on Linux kernel device driver or can be configured on the device tree.

Device usage[edit | edit source]

See the GPIOs page on the DESK-MX6UL-L Software Manual.


Electrical and Mechanical Documents[edit | edit source]

AXEL ULite Evaluation Kit is based on an Industrial product: for more information, please contact Sales department

Layout[edit | edit source]



Mechanical specifications[edit | edit source]

This page describes the mechanical characteristics of the AXEL ULite Evaluation Kit board.

Board layout[edit | edit source]

Assembly view: top
Assembly view: bottom

Dimensions[edit | edit source]

SDV04-mechanicals.png

Mechanical data[edit | edit source]

Dimension Value
Width 155 mm
Depth 87 mm
Max component's height (top) 16 mm
Max component's height (bottom) 1.9mm
PCB height 1.69 mm