RV1126B Evaluation Board Hardware Specification

1. Function Overview

1.1 Product Overview

RV1126B-Nano-TB is an AIoT motherboard for the AIoT field. The core board is based on the Rockchip RV1126B processor design. It integrates four Cortex-A53 cores and an independent NEON coprocessor, supports 4K@30fps H.264/H.265 decoding, and also supports 4K@30fps H.264/H.265 encoding. It introduces a new-generation, fully hardware-based ISP (image signal processor) with up to 12 megapixels, providing various algorithm accelerators such as HDR, 3A, LSC, 3DNR, 2DNR, sharpening, dehazing, fisheye correction, gamma correction, and feature point detection. At the same time, as a supplement to the traditional ISP, it also introduces an AI-ISP with up to 8 megapixels, providing excellent spatial noise reduction performance and powerful image enhancement. The built-in NPU delivers up to 3 TOPS of computing power and supports mixed INT4/INT8/INT16/FP16 operations. A complete Linux development package is provided for customer secondary development.

1.2 Product Images

Figure 1 Front View of the Product

Figure 2 Rear View of the Product

1.3 Product Features

Table 1 Product Features

Name	RV1126B Nano-TB	RV1126B Nano-TBI
Processor	RV1126B	RV1126BJ
Core	4×ARM Cortex-A53@1.6GHz	4×ARM Cortex-A53@1.6GHz
NPU	Supports INT4/INT8/INT16/FP16 mixed operations, computing power up to 3 TOPS	Supports INT4/INT8/INT16/FP16 mixed operations, computing power up to 3 TOPS
VPU	4K@30fps H.264/H.265 Decoder 4K@30fps H.264/H.265 Encoder	4K@30fps H.264/H.265 Decoder 4K@30fps H.264/H.265 Encoder
ISP	12M ISP+8M AI-ISP	12M ISP+8M AI-ISP
OS	Debian12/Ubuntu22.04	Debian12/Ubuntu22.04
Memory	1/2GB DDR4	1/2GB DDR4
eMMC Storage	64GB EMMC	8/16GB EMMC
MIPI DSI	1-channel 4-Lane MIPI DSI, 1.5Gbps/lane	1-channel 4-Lane MIPI DSI, 1.5Gbps/lane
MIPI CSI	2 channels, each supporting 4 lanes, 2.5Gbps/Lane	2 channels, each supporting 4 lanes, 2.5Gbps/Lane
TF Card	1-channel TF card interface	1-channel TF card interface
USB 3.0 Host	2-channel USB3.0 TYPE-A interface	2-channel USB3.0 TYPE-A interface
USB 2.0 Host	1-channel USB2.0 TYPE-A interface	1-channel USB2.0 TYPE-A interface
Type-C	1-channel firmware download interface	1-channel firmware download interface
Ethernet	2-channel Gigabit Ethernet	2-channel Gigabit Ethernet
WiFi	1-channel WiFi6	1-channel WiFi6
Bluetooth	1-channel Bluetooth 5.2	1-channel Bluetooth 5.2
NearLink (SparkLink)	1-channel NearLink communication SLE1.0	1-channel NearLink communication SLE1.0
Microphone	1-channel microphone input	1-channel microphone input
Speaker	1-channel 3W/4Ω speaker	1-channel 3W/4Ω speaker
UART	2 channels, 3.3V	2 channels, 3.3V
CAN	1 channel, 3.3V	1 channel, 3.3V
I2C	1 channel	1 channel
PWM	2 channels	2 channels
SPI	2 channels	2 channels
SAI	1 channel	1 channel
GPIO	3 channels	3 channels
Debug Serial Port	1 channel	1 channel
Indicator LED	1 power indicator	1 power indicator
Button	1 reset button, 1 LOAD button, 1 PWRON power button	1 reset button, 1 LOAD button, 1 PWRON power button
Watchdog	Supports external hardware watchdog	Supports external hardware watchdog
Supply Voltage	DC 12V voltage input	DC 12V voltage input
Mechanical Dimensions	120mm (length) *90mm (width)	120mm (length) *90mm (width)
Environmental Test	-20℃ ~ +85℃	-40℃ ~ +85℃

2. Resource Introduction

2.1 Processor RV1126B

The Rockchip RV1126B processor integrates four Cortex-A53 cores and an independent NEON coprocessor. It supports 4K@30fps H.264/H.265 decoding and also supports 4K@30fps H.264/H.265 encoding. It includes built-in RGA 2D graphics acceleration. The built-in NPU supports INT4/INT8/INT16/FP16 mixed operations, with computing power up to 3 TOPS. Network models based on frameworks such as TensorFlow, MXNet, PyTorch, and Caffe can be easily converted.

2.2 Display Interface

The RV1126B motherboard integrates one MIPI DSI 4-Lane output interface.

2.2.1 MIPI DSI

The motherboard integrates one MIPI DSI interface, supports D-PHY V2.0, and provides a maximum transmission speed of 1.5Gbps/Lane. It supports up to 1920x1080@60Hz and RGB (up to 24 bits) format. The physical interface is a 40-pin, 0.5mm-pitch horizontal FPC connector, as shown in Table 3. The reference designator of MIPI DSI is J5.

Table 3 MIPI DSI Display Interface Pin Overview

Pin No.	Signal Name	Function	Pin No.	Signal Name	Function
1	VCC5V	5V power supply	2	VCC5V	5V power supply
3	GND	System ground	4	VDD_3V3	3.3V power supply
5	VDD_3V3	3.3V power supply	6	NC	NC
7	NC	NC	8	NC	NC
9	NC	NC	10	NC	NC
11	NC	NC	12	GND	System ground
13	RST_TOUCH	Touchscreen reset signal	14	INT_TOUCH	Touchscreen interrupt signal
15	I2C_SCL	I2C clock signal	16	I2C_SDA	I2C data signal
17	PWM_LCD	Backlight brightness control signal	18	RST_LCD	Display reset signal
19	GND	System ground	20	NC	NC
21	NC	NC	22	NC	NC
23	NC	NC	24	GND	System ground
25	MIPI_DSI_D0N	Display signal channel 0 negative	26	MIPI_DSI_D0P	Display signal channel 0 positive
27	GND	System ground	28	MIPI_DSI_D1N	Display signal channel 1 negative
29	MIPI_DSI_D1P	Display signal channel 1 positive	30	GND	System ground
31	MIPI_DSI_D2N	Display signal channel 2 negative	32	MIPI_DSI_D2P	Display signal channel 2 positive
33	GND	System ground	34	MIPI_DSI_CLKN	Display clock signal negative
35	MIPI_DSI_CLKP	Display clock signal positive	36	GND	System ground
37	MIPI_DSI_D3N	Display signal channel 3 negative	38	MIPI_DSI_D3P	Display signal channel 3 positive
39	GND	System ground	40	GND	System ground

2.3 Image Input Interface

The motherboard image input interface includes two MIPI CSI channels, enabling two HD video signal inputs. The processor includes powerful 4K@30fps H.264 and H.265 encoders, enabling HD video encoding processing.

2.3.1 MIPI CSI

The motherboard integrates two MIPI CSI interfaces and supports D-PHY V1.2. Each interface has 4 lanes, with a maximum transmission speed of 2.5Gbps/Lane. The physical interface is a 40-pin, 0.5mm-pitch horizontal FPC connector. The signal definitions of the two interfaces are the same, as shown in Table 4. The two MIPI CSI interfaces are identified on the motherboard by the silkscreens “MIPI CSI0” (reference designator J3) and “MIPI CSI1” (reference designator J4).

Table 4 MIPI CSI Interface Description

Pin No.	Signal Name	Function	Pin No.	Signal Name	Function
1	NC	Not connected	2	VCC_2V8	Not connected
3	NC	Not connected	4	NC	Not connected
5	I2C_SCL	I2C clock pin	6	I2C_SDA	I2C data pin
7	GND	Digital ground	8	NC	Not connected
9	GND	Digital ground	10	NC	Not connected
11	NC	Not connected	12	GND	Digital ground
13	MIPI_CSI_RX_D2P	Data differential 2+	14	MIPI_CSI_RX_D2N	Data differential 2-
15	GND	Digital ground	16	MIPI_CSI_RX_D3P	Data differential 3+
17	MIPI_CSI_RX_D3N	Data differential 3-	18	GND	Digital ground
19	VCC_1V8	1.8V power output	20	NC	Not connected
21	NC	Not connected	22	NC	Not connected
23	VCC_1V2	1.2V power output	24	MIPI_CSI_PWDN	Enable pin
25	MIPI_CSI_RST	Reset pin	26	GND	Digital ground
27	MIPI_CSI_CLK	Main clock	28	GND	Digital ground
29	MIPI_CSI_RX_CLKP	Clock differential +	30	MIPI_CSI_RX_CLKN	Clock differential -
31	GND	Digital ground	32	MIPI_CSI_RX_D0P	Data differential 0+
33	MIPI_CSI_RX_D0N	Data differential 0-	34	GND	Digital ground
35	MIPI_CSI_RX_D1P	Data differential 1+	36	MIPI_CSI_RX_D1N	Data differential 1-
37	GND	Digital ground	38	NC	Not connected
39	NC	Not connected	40	NC	Not connected

2.4 TF Card Slot

The motherboard integrates one TF card interface, allowing a TF card to be inserted for data storage. The reference designator is J8. It supports SDIO3.0, and the signal interface voltage is dynamically adjustable, supporting 1.8V and 3.3V. The TF card can be used as the system boot disk, and booting from the TF card is supported.

2.5 USB

The motherboard has two USB3.0 interfaces, one USB2.0 interface, and one TYPE-C interface (firmware download interface).

2.5.1 USB3.0 Interface

The motherboard has two USB3.0 TYPE-A interfaces, expanded from one USB3.0 HUB chip. The interface also includes USB 2.0 signals and is a full-function USB 3.0 interface. The physical interface is a vertical TYPE-A port, with reference designators J12 and J13.

2.5.2 USB2.0 Interface

The motherboard has one USB2.0 TYPE-A interface and supports HS/FS/LS modes. Because this interface shares one set of USB signals with the TYPE-C interface, only one of this interface and the TYPE-C interface can be selected for use at a time. The physical interface of this USB2.0 port is a TYPE-A port, with reference designator USB3.

2.5.3 TYPE-C Interface

The motherboard has one USB2.0 TYPE-C interface, which functions as the system firmware download interface. The reference designator is USB1.

2.6 Ethernet

The motherboard integrates two Gigabit Ethernet interfaces and supports automatic recognition of 10/100/1000 Mbps data transfer rates. The physical interface is an RJ45 port. The reference designator for LAN0 is J7, and the reference designator for LAN1 is J6.

2.7 WiFi, Bluetooth, and NearLink

The motherboard integrates a DB37 tri-mode wireless communication module. It supports the IEEE 802.11b/g/n/ax@2.4G, BLE5.2, and SLE1.0 standard communication protocols and supports the SDIO 2.0 interface. This module supports 802.11n 20MHz/40MHz bandwidth and 802.11ax 20MHz bandwidth, providing a physical-layer speed of up to 150Mbps and longer coverage distance. The module has one antenna interface, with an IPX socket as the physical terminal. The reference designator is U21. The WiFi and Bluetooth features are shown in Table 6.

Table 6 WiFi and Bluetooth Characteristics Description

Name	Characteristics	Description
2.4GHz WiFi	WiFi Standard	IEEE 802.11b/g/n & Wi-Fi compliant
	Frequency Range	2.400 GHz ~ 2.4835 GHz (2.4GHz ISM Band)
	Number of Channels	2.4GHz: Ch1 ~ Ch13
	Modulation Mode	802.11b : DQPSK, DBPSK, CCK 802.11 g/n : OFDM /64-QAM, 16-QAM, QPSK, BPSK 802.11ax : OFDM /256-QAM, 64-QAM, 16-QAM, QPSK, BPSK
Bluetooth	Bluetooth Standard	BLE5.2
	Frequency Range	2400 MHz ~ 2483.5 MHz(2.4GHz ISM Band)
	Number of Channels	LE: Ch0~Ch39
	Modulation Mode	GFSK
NearLink (SparkLink)	NearLink Standard	SLE1.0
	Operating Frequency	2400 MHz ~ 2483.5 MHz(2.4GHz ISM Band)
	Modulation Mode	GFSK, BPSK, QPSK

2.8 Audio

The motherboard supports one microphone audio input and one speaker audio output.

2.9 MiniPCIE Expansion Interface

The motherboard supports one miniPCIE expansion interface, with reference designator J10. This interface supports USB2.0 signals but does not support PCIE functionality. It can be used to expand 4G communication modules with USB2.0 interfaces and other communication modules with USB interfaces.

2.10 Single-Row Pin Header Terminal

The motherboard reserves a single-row pin header, and the terminal includes ADC and UART. The interface description is shown in Table 7. The terminal pitch is 2.54mm. The reference designator is P2.

Table 7 Terminal Pin Description

Silkscreen Description	Function Name	Function Description
1	ADC0_IN2	ADC0 acquisition channel 2
2	UART2_RX_M0	Serial port 2 receive signal (3.3V)
3	UART2_TX_M0	Serial port 2 transmit signal (3.3V)
4	GND	GND

2.11 Expansion Pin Header Interface

The motherboard integrates an expansion pin header interface, providing resources such as ADC, I2C, and serial ports. The interface description is shown in Table 8. The terminal pitch is 2.54mm. The reference designator is P1.

Table 8 Terminal Pin Description

Silkscreen Description	Function Name	Function Description
1	VCC_3V3	3.3V voltage output
2	VCC_5V	5V voltage output
3	I2C5_SDA_M0	I2C5 data pin (3.3V)
4	VCC_5V	5V voltage output
5	I2C5_SCL_M0	I2C5 clock pin (3.3V)
6	GND	System ground
7	UART6_TX_M0	Serial port 6 transmit signal (3.3V)
8	UART7_TX_M0	Serial port 7 transmit signal (3.3V)
9	GND	System ground
10	UART7_RX_M0	Serial port 7 receive signal (3.3V)
11	UART6_RX_M0	Serial port 6 receive signal (3.3V)
12	SAI1_SCLK_M2	SAI1 serial clock signal (3.3V)
13	GPIO5_C0_D	GPIO5_C0_d (3.3V)
14	GND	System ground
15	GPIO5_C1_D	GPIO5_C1_d (3.3V)
16	CAN0_RXD_M1	CAN receive (3.3V)
17	VCC_3V3	3.3V voltage output
18	CAN0_TXD_M1	CAN transmit (3.3V)
19	SPI0_MOSI_M2	SPI0 master output slave input (3.3V)
20	GND	System ground
21	SPI0_MISO_M2	SPI0 master input slave output (3.3V)
22	SPI1_CSN1_M1	SPI1 chip select signal 1 (3.3V)
23	SPI0_CLK_M2	SPI0 clock signal (3.3V)
24	SPI0_CSN0_M2	SPI0 chip select signal 0 (3.3V)
25	GND	System ground
26	SPI0_CSN1_M0	SPI0 chip select signal 1 (3.3V)
27	SPI1_MOSI_M1	SPI1 master output slave input (3.3V)
28	SPI1_CSN0_M1	SPI1 chip select signal 0 (3.3V)
29	SPI1_MISO_M1	SPI1 master input slave output (3.3V)
30	GND	System ground
31	SPI1_CLK_M1	SPI1 clock signal (3.3V)
32	PWM1_CH0_M1	PWM1 channel 0 output (3.3V)
33	PWM1_CH1_M1	PWM1 channel 1 output (3.3V)
34	GND	System ground
35	SAI1_LRCK_M2	SAI1 frame clock signal (3.3V)
36	SAI1_MCLK_M2	SAI1 main clock (3.3V)
37	GPIO5_C2_D	GPIO5_C2_d (3.3V)
38	SAI1_SDI_M2	SAI0 data input
39	GND	System ground
40	SAI1_SDO_M2	SAI1 data output

2.12 Indicator LEDs

The motherboard integrates two indicator LEDs, both in SMD LED form. Reference designator D79 is the power indicator LED, indicating whether the system is powered on normally. Reference designator D36 is the 4G module communication indicator LED, indicating whether 4G module communication is normal.

2.13 Buttons

The motherboard integrates three tact switches. The button descriptions are shown in Table 10.

Table 10 Button Description

Reference Designator	Name	Description
S1	RESET	Reset button
S2	LOAD	Loader mode button. Hold down this button and press the reset button to enter Loader download mode
S4	PWRON	Power on/off button

2.14 Hardware Watchdog

The motherboard integrates one hardware watchdog, and the watchdog overflow time is 1.6 seconds. In other words, if the watchdog is not cleared (fed) within 1.6 seconds, the watchdog generates a reset signal to reset the system. Therefore, to prevent a system reset, the Lingmou system clears the watchdog every 0.8 seconds (≤ overflow time * 1/2). If the watchdog needs to be [disabled], open the enclosure and set “WDT” on DIP switch S3 (reference designator) to “ON”. If “WDT” on DIP switch S3 is set to “1”, the watchdog operates normally.

2.15 DC Socket

The power interface of the motherboard is a 5.5mm standard DC socket, with reference designator J11. The supply voltage is a standard 12V input, and a 12V 3A power adapter is recommended.

3. Electrical Parameters

3.1 Power Parameters

Table 11 Power Parameters

Parameter	Supply Voltage	Supply Current	Total Power Consumption	Unit
Normal system startup	12V	0.195A	2.34W	V/A/W
Enter freeze sleep mode	12V	0.069A	0.828W	V/A/W
Enter mem sleep mode	12V	0.083A	0.996W	V/A/W
CPU utilization 50% (2 cores fully loaded)	12V	0.225A	2.70W	V/A/W
CPU utilization 100% (4 cores fully loaded)	12V	0.255A	3.06W	V/A/W
CPU utilization 50% + NPU running at maximum compute load	12V	0.393A	4.71W	V/A/W

4. Mechanical Dimensions

Table 12 Mechanical Dimensions

Parameter	Specification	Description
Board Length	120mm	—
Board Width	90mm	—
Positioning Hole Size	3mm	Fixed using M3 screws

Figure 3 Mechanical Dimension Drawing