Rockpi4/hardware/rockpi4

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    ROCK Pi 4 >  Hardware >  Main Board

This hardware user manual provides information about the features and signals available on ROCK Pi 4 board.

Processor

The Rockchip RK3399 Soc used in ROCK Pi 4 includes 64bits hexa core processor with dual 1.8GHz Cortex-72 and qual 1.4GHz Cortex-A53, Mali T860MP4 graphics processing unit (GPU) and Internal SRAM. It has a level 1 (L1) cache and a level 2 (L2). For level 1 cache, 48KB Icache and 32KB Dcache is for each A72. 32KB Icache and 32KB Dcache is for each A53. For level 2 cache, 1024KB cache is for big cluster and 512KB cache is for little cluster.

Networking

On the ROCK Pi 4 Model A, B board, the Giga Bit Ethernet port is provided. From the test result, we know that the bandwidth is at least 939Mbits/sec. If you are interested in POE (Power Over Ethernet), you should try it on the Pi 4 board.

The ROCK Pi 4 Model B is equipped with 2.4GHz 802.11 b/g/n and 5G ac/a WIFI. The Pi 4B also features Bluetooth 5.0.

Two LEDs are built into the RJ-45 LAN connector. This table describes the LED states when the board is powered up and the LAN subsystem is operating.

LED	LED Color	Led State	Condition
Link	Green	Off On	LAN link is not established. LAN link is established.
Data Rate	Yellow	Blinking Off	There is activity on this port. No link is established.

Peripherals

The ROCK Pi 4 Model A and B have four USB-A connectors. One is for USB 3.0 OTG. One is for 3.0 HOST. And the others are for USB 2.0 HOST. The hardware switch for host/device switch may be useful when you use the USB 3.0 OTG connector. The ROCK Pi 4 may be operated with any generic USB computer keyboard and mouse. It may also be used with USB storage, USB to MIDI converters, and virtually any other device/component with USB capabilities.

The ROCK Pi 4 Model A and B are equipped with a standard 3.5mm jack. An audio lead is necessary to produce sound when there is not an HDMI cable. Audio can be played through speakers or headphones using jack. This requires you to use the Desktop volume control for configuration.

MIPI Camera Interface

There is a wide range of camera applications in our lives. MIPI CSI 2 lane on board support 800 MP camera via FPC connector.

The MIPI CSI interface pin specification shows below.

Pin#	Name
1	VCC_CAM
2	I2C4_SDA
3	I2C4_SCL
4	CAM_MCLK
5	CAM_GPIO1
6	GND
7	MIPI_RX0_CLKP
8	MIPI_RX0_CLKN
9	GND
10	MIPI_RX0_D1P
11	MIPI_RX0_D1N
12	GND
13	MIPI_RX0_D0P
14	MIPI_RX0_D0P

MIPI Display Interface

The ROCK Pi 4 Model A and B are equipped with one HDMI connector and one MIPI DSI. As for HDMI, the maximum resolution is 4k@60Hz. Any HDMI monitor should work as a display for the Pi 4. As for MIPI DSI, it is designed for raw LCD pannel. HDMI and MIPI DSI can work at the same time.

The MIPI DSI interface pin specification shows below.

Pin#	Name
1	VCC_MIPI
2	VCC_MIPI
3	GND
4	I2C_SDA_AUDIO
5	I2C_SCL_AUDIO
6	GND
7	MIPI_TX/RX_D0P
8	MIPI_TX_RX_D0N
9	GND
10	MIPI_TX/RX_CLKP
11	MIPI_TX_RX_CLKN
12	GND
13	MIPI_TX/RX_D1P
14	MIPI_TX/RX_D1N
15	GND

TF Card Interface

The TF card can be used as a system storage or an external storage. When it's used as a system storage, you had better choose the ones with storage space larger than 8GB. When it's used as an external storage, you can choose the ones with storage space up to 128GB. When the TF card is inserted into the TF card slot , the device will be automatically recognized by the system.

The TF card interface pin specification shows below.

Pin#	Name
1	SDMMC0_D2
2	SDMMC0_D3
3	SDMMC0_CMD
4	VCC3V3_SYS
5	SDMMC0_CLK
6	GND
7	SDMMC0_D0
8	SDMMC0_D1
9	SDMMC0_DET_L
10	GND
11	GND
12	GND
13	GND

eMMC Socket on Board Interface Feature(Not available on 4A+/4B+)

The high performance eMMC module is the best choice as the system storage for ROCK Pi 4. The eMMC module with 8GB/16GB/32GB/64GB/128GB is available.

The eMMC Socket pin specification shows below.

Name	Pin#	Pin#	Name
GND	1	34	GND
EMMC_D5	2	33	EMMC_D6
GND	3	32	GND
EMMC_D4	4	31	EMMC_D7
GND	5	30	GND
EMMC_D0	6	29	EMMC_D1
GND	7	28	GND
EMMC_CLK	8	27	EMMC_D2
GND	9	26	GND
EMMC_D3	10	25	EMMC_CMD
GND	11	24	GND
EMMC_RSTN	12	23	VCC3V3_SYS
GND	13	22	VCC3V3_SYS
GND	14	21	VCC_1V8
EMMC_RCLK	15	20	VCC_1V8
GND	16	19	GND
GND	17	18	GND

PCIE M.2 NGFF M-KEY SOCKET Interface

There is one PCIe port in Soc RK3399 and it is compatible with PCI Express Base Specification Revision 2.1.

On ROCK Pi 4 board, M.2 connector supports up to 2T M2 NVME SSD.

The PCIE M.2 interface pin specification shows below.

Name	Pin#	Pin#	Name
GND	1	2	+3.3V
GND	3	4	+3.3V
PERn3	5	6	NC
PERp3	7	8	NC
GND	9	10	DAS/DSS#
PETn3	11	12	+3.3V
PETp3	13	14	+3.3V
GND	15	16	+3.3V
PERn2	17	18	+3.3V
PERp2	19	20	EMMC_CMD
GND	21	22	NC
PETn2	23	24	NC
PETp2	25	26	NC
GND	27	28	NC
PERn1	29	30	NC
PERp1	31	32	NC
GND	33	34	NC
PETn1	35	36	NC
PETp1	37	38	DEVSLP
GND	39	40	NC
PERn0/SATA-B+	41	42	NC
PERp0/SATA-B-	43	44	NC
GND	45	46	NC
PETn0/SATA-A-	47	48	NC
PETp0/SATA-A+	49	50	PERST#
GND	51	52	CLKREQ#
REFCLKN	53	54	PEWake#
REFCLKP	55	56	NC
GND	57	58	NC

NC	67	68	SUSCLK
PEDET	69	70	+3.3V
GND	71	72	+3.3V
GND	73	74	+3.3V
GND	75

HDMI Interface