Shulou(Shulou.com)06/03 Report--

1. Overview of i.MX8M development board

NXP's i.MX8M family of application processors are based on Arm ®Cortex ®- A53 and Cortex-M4 cores with industry-leading audio, voice and video processing capabilities for a wide range of applications from consumer home audio to industrial building automation and mobile computers.

As a design company officially cooperated by NXP, Mill Electronics has launched a development platform MYD-JX8MX series development board based on NXP's i.MX8M series chips to meet the board requirements of this kind of high-performance products. The development board adopts the form of core board and backplane, and provides peripheral interfaces such as HDMI,LVDS (or MIPI), dual camera input (CSI), 4G module expansion (with SIM card holder), WIFI Bluetooth module, multi-channel USB, multi-serial port and so on. At the same time, Mill provided the complete software package and supporting documentation for Linux. The following is to share the details of i.MX8M series development boards:

I.MX8M processor has the following characteristics: 

Multicore processing: Quad Arm Cortex-A53; Cortex-M4FGPU: OpenGL/ES 3.1,3.0, Vulkan, OpenCL 1.2 dual independent display interfaces: MIPI-DSI (4 channels); HDMI 2.0a video playback: 4Kp60 high dynamic range (H.265, VP9), 4Kp30 (H.264), 1080p60 (MPEG2, MPEG4p2, VC1, VP8, RV9, AVS/AVS+, h.263 and DiVX) and MJPEG-8x8  Audio: 6x I2S/SAI (20 + channels, 32 bits per channel @ 384 KHz) SPDIF Tx/Rx; DSD512  dual camera interface: MIPI-CSI (each 4 channels)  external memory interface: LPDDR4, DDR4, DDR3L; Quad SPI  with XIP dual USB 3.0 C  with PHY provides dual PCIe in L1 sub-state, with fast wake-up function from low power mode  has Gigabit Ethernet controller  operating system: Linux OS, Android, FreeRTOS  temperature: consumer electronics (0 °C to 95 °C Tj) Industrial control (- 40 °C to 105 °C Tj)  package: FCBGA,0.65 mm spacing

2.1 introduction of i.MX8M development board

MYD-JX8MX is based on the high-performance NXP i.MX8M series processor design. Including Ethernet, USB3.0, WIFI, and other rich peripheral resources. MYD-JX8MX consists of two PCB pieces:

MYC-JX8MX: standard core board, including processor, DDR,eMMC and Ethernet PHY.  MYB-JX8MX: extended function board, including Ethernet, HDMI, camera interface, USB3.0 interface, audio interface, SD card, 4G module, WIFI, Bluetooth and other functions.

2.2i.MX8M system block diagram

Core board system block diagram and function identification diagram

Development board system block diagram and function identification diagram

2.3 function list of i.MX8M development board

2.3.1 function list of core board

The MYC-JX8MX core board adopts the form of Goldfinger interface, which integrates the main chip, power management chip, EMMC, LPDDR4, gigabit network PHY and other resources. The board adopts 10-layer PCB design to ensure the stability and performance of the system.

I.MX8M series core board function list

Sequence functional parameters 1CPU  i.MX8M processor, 4 cores, 1.3GHz MIMX8MQ6CVAHZAB  later optional other chips 2DDR  1GB LPDDR4,2GB LPDDR4,3GB LPDDR optional 3eMMC  4GB 1GB LPDDR4,2GB LPDDR4,3GB LPDDR 8GB EMMC option 4QSPI Flash  256Mb capacity, W25Q256JVEIQ5 power management  5V input, Roma PMIC,BD71837MWV6 Ethernet PHY  10Compact 100pm 1000m PMIC,BD71837MWV6 AR80357 expansion seat  uses 314pin, Goldfinger connector

2.3.2 backplane product picture and function list

The backplane MYB-JX8MX integrates rich peripheral resources, gives full play to the product performance of i.MX8M, and provides dedicated peripherals for current mainstream product applications. The main feature resources are as follows:

1. Rich audio and video interfaces

(1) two-way video output: 

One channel is HDMI output, which supports 4K resolution HD output . The other main chip MIPI-DSI interface directly leads out. At the same time, the MIPI-DSI is transferred to LVDS circuit in the circuit, and the customer chooses one of the two to use according to the screen situation.

(2) Multi-channel video input:  2-way MIPI-CSI video input interface  expands 4-way USB interface, which can be connected with USB camera as needed.

(3) Audio input and output: 

Using WM8904 audio chip to provide high quality audio input and output function

2. Multiple communication interfaces

(1) support MINI PCIE 4G LTE module extension: the  program supports moving away from EC20 4G module by default, and can use the GPS function in the module.

(2) using PCIE WIFI Bluetooth module: 

Use 8274B-PR PCI-e WIFI Bluetooth module to provide high-speed, high-quality wireless network links.

(3) Gigabit network communication 3. Multiple storage and device expansion

(1) support NVME M.2 SSD extension 

Onboard NVME M.2 SSD expansion module to support high-capacity and high-speed SSD hard disk expansion

(2) using USB TYPE C interface to provide USB 3.0high-speed interface  provides five USB interfaces extended by USB 3.0( one of which is in the pin row and the other four are led by the USB TYPE A pedestal) to facilitate the expansion of USB equipment and improve the performance of USB peripherals.

(3) provide 2 serial ports and lead to SPI interface, so it is convenient to use SPI to expand more serial ports.

I.MX8M series feature list

Serial number function module parameter description 1 power input 12V/3A power input 24G module move away from EC20 7 module, use Micro SIM card holder 3WIFI & BTPCIe Bluetooth & WIFI two-in-one module, FN-LINK,8274B-PR.4 Ethernet RJ45 interface, 10pm 1000 Ethernet 5HDMI standard HDMI interface, support 4K playback 6 audio output and input interface 1 way 3.5MM stereo input, 1 way audio output interface Audio decoding chip WM89047USB Host5 USB 2.0 Host interface, using USB 3.0hub USB5807 expansion, of which 4 use standard USB type A, one lead to 8USB Type C standard USB 3.0 type C interface 9Micro SD card interface Micro SD card interface, 4 bit10 camera interface two ways MIPI-CSI interface, using FPC seat 11M.2 interface to support PCIe X112 debugging serial port debugging serial port The 13LVDS/DSI interface of 3pin XH seat provides LVDS interface / MIPI-DSI interface by default, and one of the two 14RTC adopts external RTC15 startup configuration 4bit sliding switch 16 expansion interface adopts 2.0MM row pin 17 key 1Resetjor 1Onhand offset 1reason User18LED2UserMagne1LTE

3.i.MX8M software resources

3.1 Software description

The MYD-JX8MX series development board provides a complete list of software development resources and documentation. Among them are

Linux:

UBoot version: 2017.03-imx_v2017.03_4.9.88_2.0.0_ga 

Linux version: imx_4.9.88_2.0.0_ga 

Android:

Android 8.1.0_1.3.0

3.2 i.MX8M series software feature list

Serial number function / interface function and implementation 1 serial port / 3pin pin can send and receive data 2 Ethernet supports 10M/100M/1000M communication rate, ping network equipment 3Wifi/BT Wifi supports station mode, can be connected to hot spot 44G module EC20 can dial, obtain ip, ping can play video through external network 5Hdmi, sound normal 6 audio interface can be used to record and play sound 7Usb host can be used to connect USB peripherals Can normally use 8Usb type C to burn mirror 9Micro SD identification SD card 10MIPI-CSI imaging normal 11M.2 external mount SSD, device normal 12DSI MIPI-DSI display 13 external RTC clock display normal 14 button User reset power button normal 15LED1x power 1x Lte 2x user

3.3 list of software resources

3.3.1 list of Linux software resources

Category name description information source code bootstrap first-level boot launcher YESLinux kernel Image based on the official imx_4.9.88_2.0.0_ga version YES device driver PMICBD71873PMIC device driver YES device driver YES device driver USB OTGUSB OTG driver YES device driver I2CI2C bus device driver SPISPI device driver YES device driver YES device driver MMCMMC/eMMC/ TF card storage driver YES Device driver HDMI Hdmi display driver YES device driver YES device driver PWMPWM control YES device driver RTC real-time clock driver YES device driver IO driver YES device driver Touch capacitive touch YES device driver AudioWM8904 driver YES driver YES device driver WiFi & BTQCA6174 driver NO device driver YES device driver LTE module only supports moving away EC20 Use USB driver YES device driver M.2NVME driver YES file system Yotctorootfs build file system with Qt 5.9.File system based on Yocto Yotctorootfs build terminal-type general file system YES application GPIO KEY key press routine YES application GPIO LED indicator routine YES application NETTCP/IPSokect Cgamard S routine YES application RTC real-time clock routine YES routine YES application AudioAudio example Program YES application LCD display routine YES application Camera multi-camera display routine YES compilation tool chain Cross compilerYocto GCC 7.3.0HardfloatBINARY

3.3.2 Android Software Resource list

(please refer to the official product manual)

4.i.MX8M electrical parameters

Project parameters: working temperature commercial grade: 0mm + 70 ℃ commercial grade; wide temperature class:-30 ℃ 80 ℃ wide temperature class Ambient humidity  20% 90%, non-condensing mechanical dimensions  core board: 50mm82mm  backplane: 180 mm 110 mmPCB specification  core board: 10 layers, gold deposition process production, independent grounding signal layer, lead-free  base plate: 6 layers, gold deposition process production, independent grounding signal layer, lead-free power supply  core board: 5V  development board: 12V

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