Introduction

This document provides the memory map and locations of reference materials for those who wish to add additional hardware to their NetBurner device.

Processor Information

The SOMRT1061 uses the NXP i.MX RT1061 microprocessor. The reference manual and datasheet provide in-depth information on the microprocessor, including register settings, bus configuration and timing information. It is located in the <nburn_install>\docs\NXP directory of your NetBurner installation.

Definitions

Definitions for the MIMXRT1061 can be found at arch/cortex-m7/cpu/MIMXRT10xx/include/MIMXRT1061.h

Datasheet and Pins

The datasheet for the SOMRT1061 module includes information on connectors, signal names, and operational parameters. It is located on the SOMRT1061 product page under Documents and Downloads.

An Excel spreadsheet of pin assignments is also available under the same Datasheet link.

Finally, NetBurner has created an interactive Pin Configurator tool which is available online as well as in your NNDK installation under <nburn_install>\docs\NetBurner\Platform\PinConfigurator

You may also find pinconstant.h to be a useful reference.

Development Board Schematic

The DEV-SOMRT1061 development board schematic is located in the <nburn_install>\docs\NetBurner\platform\Schematics directory. This schematic can be used for design ideas in your own hardware implementation for power, RS-232, RS-485, and SD Flash card implementation.

SOMRT1061 Platform General Information

The SOMRT1061 uses the NXP i.MX RT1061 microcontroller. The reference manual and datasheet provide in-depth information on the processor, including register settings, bus configuration and timing information. The reference manual is located in the <nburn_install>\docs\NXP directory of your NetBurner installation.

i.MX RT1061 running at 528MHz (ind temp)
8MB SPI Flash (stores compressed application image)
32MB PSRAM
1MB onboard SRAM:
- 128k ITCM single cycle instruction fetch memory,
- 128K DTCM single cycle data fetch memory
- 768k general purpose fast SRAM

The 8MB of Flash uses a Flash File System and is used for all storage purposes:

Sectors are 8k
The standard NetBurner configuration, certificate and user flash operate transparently through the file system.
First sector reserved for file partition table. Note: If you need direct flash access, please contact NetBurner support.
You can add a secondary Flash File System as demonstrated in the EFFS-STD examples. Multiple partitions are supported. Please refer to the documentation and examples, such as the EFFS-STD multiple partition (multi-part) example.
Application space varies by use case, but is typically 7.5MB for the compressed application. Items that can reduce the 8MB total space include: file system overhead, certificates, configuration data, secondary file system.

External Memory Bus

Chip selects configurable anywhere in the external bus range

Boot Sequence

At power-up or reset, the application is decompressed from Flash memory to PSRAM, verified by checksum, and execution begins. If the checksum fails or the application crashes, the device will reboot to the Configuration Server to facilitate a recovery by downloading a new application.

If the application causes an issue in which continuous traps occur, or the state of the system is such the Configuration Server cannot run, a recovery hardware jumper procedure can be used to reset the device.

Note: It is always a good idea to have a serial port terminal connected to the boot/debug serial port to view status messages, or use the 'A' to abort the boot sequence command when prompted to abort application execution and boot to the Configuration Server.

UART Signals and Port Number Mapping

There can be a maximum of 7 serial port configured on the device. Note that each signal pin on the microprocessor can be configured for up to 5 different functions, so to achieve the maximum number of serial ports some peripheral functions will be unavailable.

Please refer to the Open All Serial Ports example for hardware and software port mapping: Open All UARTs. Port number mapping for software API calls is defined in SOMRT1061/include/serial_platdefs.h in the <nburn_install>\platform folder.