# RVBoards-Nezha: Motherboard only
**1.**Nezha motherboard, one piece
**2.**Are there others?

# RVBoards-Nezha:Set
**1.**Nezha motherboard, one piece
**2.**Shell (acrylic board), one
**3.**Power adapter, one
**4.**Network cable, one
**5.**SD card, one
**6.**USB HUB, one

# RVBoards-Nezha: Blind Box One
**1.**Nezha motherboard, one piece
**2.**Shell (acrylic board), one
**3.**Power adapter, one
**4.**Network cable, one
**5.**SD card, one
**6.**USB HUB, one
**7.**Comes with hardware, one (may be LCD screen, microphone board, light board, T-shirt...)

# RVBoards:OpenSDK_D1
OS：Debian
Tools: gcc, make, git
Lanuage: Support c, c++, rust, python and other languages programming
For details, please see：[RVBoards](https://rvboards.org/ "RVBoards")

# Hardware:Nezha
The customized development board based on Allwinner's D1 chip is the world's first mass-produced development board that supports 64bit RISC-V instruction set and Linux system. It has rich audio and video interfaces, powerful audio and video encoding and decoding capabilities, and can be connected Various peripherals, integrated MIPI-DSI+TP interface, SD card interface, LEDC light, HDMI interface, microphone sub-board interface, 3.5mm headphone jack, Gigabit Ethernet interface, USB HOST, Type-C interface, UART Debug Interface, 40pins pin array, etc.

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![](././../../images_dir/1620299166/2.png)
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![](././../../images_dir/1620299217/3.png)
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## Specifications
**Main control:**Allwinner D1 C906 RISC-V 1GHz/0.9v
**DRAM：**DDR3 1GMB（2*512MB outside），792MHz
**Storage：**Onboard 256MB spi-nand, support USB external U disk and SD card to expand storage.
**Network：**Support Gigabit Ethernet (RTL8211F), support 2.4G WiFi and Bluetooth (XR829 wireless module), onboard antenna
**Display：**Support MIPI-DSI+TP screen interface, support HDMI output, support SPI screen
**Audio：**Microphone sub-board interface 1, 3.5mm headphone interface 1 (CTIA)
**DEBUG：**Support uart serial port debugging, support ADB USB debugging
**USB：**USB HOST 1, USB OTG 1, support USB2.0
**PIN：**40pins pin array, use PCF8574 GPIO to expand the chip to expand GPIO
**Power input：**Type-C USB 5V-2A
**Board size：**length 85mm width 56mm thickness 1.7mm
**PCB layer：**6 layers

# Hardware specification
For details, please visit[www.rvboards.org](https://rvboards.org/ "www.rvboards.org")

## Development board block diagram

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![](././../../images_dir/1620299606/4.png)
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## USB interface
There is a USB HOST and two Type-C USB ports on the board, among them:

(1)The one next to HDMI can only be used forpower supply, and the input voltage/current is 5V/2A;
The USB Type-C next to the serial line is used for data transmission, which can perform firmware burning, device information burning, ADB shell, adb push/pull and other operations, and it can also supply power. The power supply depends mainly on the PC USB port The current output can generally meet the system startup requirements, but some functions may not have enough power, such as MIPI-DSI screens, etc., which need to be plugged in 5V/2A to stabilize the power supply;
(3) USB HOST can be used to plug in U disk, USB camera, mouse, keyboard, etc., following the **standard USB 2.0 protocol**.

## Serial port

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![](././../../images_dir/1620300005/5.png)
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The UART port on the development board has 3 pins, which are **GND, RX, and TX**. The corresponding function of each plug is printed on the body of the development board.
 
The line sequence of the official CH340 serial port is: black-GND, green-RX, white-TX, and red is the power supply. There is no need to plug it here. The specific connection is as shown in the figure below.

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![](././../../images_dir/1620300534/6.png)
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Baud rate:**115200**

## Microphone daughter board cable sequence

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![](././../../images_dir/1620300677/7.png)
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## 40pin pin

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![](././../../images_dir/1620300732/8.png)
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## Display interface
The display interface can be connected to the MIPI-DSI screen and touch. The line sequence is as follows:

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![](././../../images_dir/1620300818/9.png)
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## Board physical size

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![](././../../images_dir/1620300883/10.png)
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![](././../../images_dir/1620300905/11.png)
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# D1 chip introduction, C906 RISC-V 64bit processor

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![](././../../images_dir/1620300971/12.png)
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D1 is Allwinner's first chip based on the RISC-V instruction set. It integrates the 64-bit C906 core of Ali Pingtou, supports RVV, 1GHz frequency, and supports Linux, RTOS and other systems. At the same time, it supports up to 4K H.265/H.264 decoding, a built-in HiFi4 DSP, and an external connection of up to 2GB DDR3, which can be used in many fields such as smart business display, smart home appliances, smart office, smart city, scientific research and education.

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![](././../../images_dir/1620301056/13.png)
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## Chip block diagram

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![](././../../images_dir/1620301116/14.png)
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## Specifications
### CPU

Ali Pingtou Xuantie **C906 main core**, 64bit RISC-V instruction set.

32 KB I-cache + 32 KB D-cache

### DSP

HiFi4 DSP  600MHz@0.9V
		32 KB I-cache + 32 KB D-cache
		64 KB I-ram + 64 KB D-ram

### Memory

DDR2/DDR3, up to 2 GB
		SD3.0/eMMC 5.0, SPI Nor/Nand Flash

### Video Engine

Video decoding

- H.265 up to 1080p@60fps, or 4K@30fps
		- H.264 up to 1080p@60fps, or 4K@24fps
		- MPEG-1/2/4, JPEG, VC1 up to 1080p@60fps

Video encoding

- JPEG/MJPEG up to 1080p@60fps
		- Supports input picture scaler up/down

### Video OUT

RGB LCD output interface up to 1920 x 1080@60fps
		Dual link LVDS interface up to 1920 x 1080@60fps
		4-lane MIPI DSI interface up to 1920 x 1080@60fps
		HDMI V1.4 output interface up to 4K@30fps
		CVBS OUT interface, supporting NTSC and PAL format

### Video IN

8-bit parallel CSI interface
		CVBS IN interface, supporting NTSC and PAL format

### Audio

2 DACs and 3 ADCs
		Analog audio interfaces: MICIN1P/N, MICIN2P/N, MICIN3P/N, FMINL/R, LINEINL/R, LINEOUTLP/N, LINEOUTRP/N, HPOUTL/R
		Digital audio interfaces: I2S/PCM, DMIC, OWA IN/OUT

### Connectivity

USB2.0 OTG, USB2.0 Host
		SDIO 3.0, SPI x 2, UART x 6, TWI x 4
		PWM (8-ch), GPADC (2-ch), LRADC (1-ch), TPADC (4-ch), IR TX&RX
		10/100/1000M EMAC with RMII and RGMII interfaces

### Package

LFBGA BGA13*13/0.35/0.65mm,337 PINS

### Chip process

22nm

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![](././../../images_dir/1620302363/16.png)
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![](././../../images_dir/1620302434/18.png)
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![](././../../images_dir/1620302487/20.png)
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# About us
Company Address: 101-14, 3rd Floor, Building 9, No. 55 Zique Road, Haidian District, Beijing
Company Tel: 010-62600622
Technical support WeChat ID: longwayback
Business cooperation hotline: 13510090675

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