Hardware Interface Description

Chip block diagram

Physical photographs

Interface details

40-PIN GPIO Header

GPIO Voltage

Type	Voltage	Tolerance
GPIO	3.3V	3.63V
ADC	1.8V	1.98V

GPIO Pinout

ROCK 3B provides a 40 pin GPIO socket that is compatible with most sensor applications on the market.

tip

Actual compatibility is subject to actual use.

v1.1

GPIO number	Function4	Function3	Function2	Function1	Pin#	Pin#	Function1	Function2	Function3	Function4	GPIO number
				+3.3V	1	2	+5.0V
32	CAN1_RX_M0	UART3_RX_M0	I2C3_SDA_M0	GPIO1_A0	3	4	+5.0V
33	CAN1_TX_M0	UART3_TX_M0	I2C3_SCL_M0	GPIO1_A1	5	6	GND
13		PWM1_M1	I2C2_SCL_M0	GPIO0_B5	7	8	GPIO0_D1	UART2_TX_M0			25
				GND	9	10	GPIO0_D0	UART2_RX_M0			24
116		UART7_TX_M1	PWM14_M0	GPIO3_C4	11	12	GPIO3_A3				99
117		UART7_RX_M1	PWM15_IR_M0		13	14	GND
16		UART0_RX	PWM1_M0	GPIO0_C0	15	16	GPIO0_B6	I2C2_SDA_M0	PWM2_M1		14
				+3.3V	17	18	GPIO3_B2	UART4_TX_M1	PWM9_M0		106
146	CAN1_TX_M1	SPI3_MOSI_M1	PWM15_IR_M1	GPIO4_C3	19	20	GND
149	UART9_TX_M1	SPI3_MISO_M1	PWM12_M1	GPIO4_C5	21	22	GPIO0_C1	PWM2_M0	UART0_TX		17
147	CAN1_RX_M1	SPI3_CLK_M1	PWM14_M1	GPIO4_C2	23	24	GPIO4_C6	PWM13_M1	SPI3_CS0_M1	UART9_RX_M1	150
				GND	25	26	GPIO4_D1	SPI3_CS1_M1			153
12	USB_DP	CAN0_RX_M0	I2C1_SDA	GPIO0_B4	27	28	GPIO0_B3	I2C1_SCL	CAN0_TX_M0	USB_DM	11
95				GPIO2_D7	29	30	GND
96				GPIO3_A0	31	32	GPIO3_C2	UART5_TX_M1			114
115		UART5_RX_M1	SPI1_CLK_M1	GPIO3_C3	33	34	GND
100				GPIO3_A4	35	36	GPIO3_A2				98
				SARADC_VIN5	37	38	GPIO3_A6				102
				GND	39	40	GPIO3_A5				101

• Addition to the 40-pin Expansion Block for V1.1 Hardware Versions

  • The pins marked in orange are used for debug console.
  • PWM: x7, PWM1 / PWM2 / PWM9 / PWM12 / PWM13 / PWM14 / PWM15
  • SPI: x1, SPI3
  • I2C: x3, I2C1 / I2C2 / I2C3
  • UART: x6, UART0 / UART2 /UART3 / UART5 / UART7 / UART9
  • ADC: x1, SARADC_VIN5
  • CAN: x2, CAN0 / CAN1

USB Function Configuration on 40-Pin

On the ROCK 3B's 40-Pin interface, the following pins can be configured for USB 2.0:

• USB3_DM: Pin number 28, resistor location R90538.
• USB3_DP: Pin number 27, resistor location R90536.

By default, Pin-27 can be configured in software for functions such as GPIO0_B4 (see 40-Pin Pinout), while the USB3_DP signal is not activated on the hardware. Pin-28 can be configured in software for functions such as GPIO0_B3 (see 40-Pin Pinout), and the USB3_DM signal is also not activated on the hardware. To change these pins to USB functions, please follow the steps below to modify the reserved resistors:

• Remove the 0-ohm resistors at R90535 and R90537.
• Solder 0-ohm resistors at R90536 and R90538.

tip

The schematic and resistor locations can be viewed and downloaded from the hardware documentation.Hardware Documentation Download

[Operation Note]

This procedure requires soldering skills, and it is recommended that it be performed by an experienced technician.

eMMC && SPI Flash Connector

Pin	Name	Pin	Name
1	GND	2	eMMC_D5/FLASH_D5
3	GND	4	eMMC_D4/FLASH_D4
5	GND	6	eMMC_D0/FLASH_D0
7	GND	8	eMMC_CLKOUT
9	GND	10	eMMC_D3/FLASH_D3
11	GND	12	eMMC_RSTn
13	GND	14	GND
15		16	GND
17	GND	18	GND
19	GND	20	VCC18_EMMC
21	VCC18_EMMC	22	VCCIO_FLASH
23	VCCIO_FLASH	24	GND
25	eMMC_CMD	26	GND
27	eMMC_D2/FLASH_D2	28	GND
29	eMMC_D1/FLASH_D1	30	GND
31	eMMC_D7/FLASH_D7	32	GND
33	eMMC_D6/FLASH_D6	34	GND
35	GND	36	GND
37	GND	38	GND
39	GND	40	GND
41	GND	42	GND
43	GND	44	GND
45	GND	46	GND
47	GND	48	GND
49	GND	50	GND
51	GND	52	GND
53	GND	54	GND
55	GND	56	GND
57	GND	58	GND
59	GND	60	GND
61	GND	62	GND
63	GND	64	GND

FAN

Pin	Name	Pin	Name
1	GPIO3_B1/PWM8	2	VCC5V0_SYS
3	GND	4	GND

HDMI

Pin	Name	Pin	Name
1	HDMI_TX2P_PORT	2	GND
3	HDMI_TX2N_PORT	4	HDMI_TX1P_PORT
5	GND	6	HDMI_TX1N_PORT
7	HDMI_TX0P_PORT	8	GND
9	HDMI_TX0N_PORT	10	HDMI_TXCLKP_PORT
11	GND	12	HDMI_TXCLKN_PORT
13	HDMI_TX_CEC_PORT	14
15	HDMI_TXDDC_SCL_PORT	16	HDMI_TXDDC_SDA_PORT
17	GND	18	VCC5V_HDMI_TX
19	HDMI_TX_HPD_PORT	20	GND
21	GND	22
23	GND

MicroSD Card

Pin	Name	Pin	Name
1	SDMMC0_D2/ARMJTAG_TCK	2	SDMMC0_D3/ARMJTAG_TMS
3	SDMMC0_CMD		VCC3V3_SD
5	SDMMC0_CLK		GND
7	SDMMC0_D0		SDMMC0_D1
9	SDMMC0_DET_L

MIPI

• MIPI DSI

Pin	Name	Pin	Name
1	LCD_VCC	2	LCD_VCC
3	GPIO4_C0	4	GPIO2-D3
5		6	GND
7	MIPI_DSI_TX0_D0N/LVDS_TX0_D0N	8	MIPI_DSI_TX0_D0P/LVDS_TX0_D0P
9		10	MIPI_DSI_TX0_D1N/LVDS_TX0_D1N
11	MIPI_DSI_TX0_D1P/LVDS_TX0_D1P	12	GND
13	MIPI_DSI_TX0_CLKN/LVDS_TX0_CLKN	14	MIPI_DSI_TX0_CLKP/LVDS_TX0_CLKP
15	GND	16	MIPI_DSI_TX0_D2N/LVDS_TX0_D2N
17	MIPI_DSI_TX0_D2P/LVDS_TX0_D2P	18	GND
19	MIPI_DSI_TX0_D3N/LVDS_TX0_D3N	20	MIPI_DSI_TX0_D3P/LVDS_TX0_D3P
21	GND	22	GND
23	GPIO3_C5	24	VCC3V3_SYS
25	GPIO3_C4	26	I2C2_SDA
27	I2C2_SCL	28	GND
29	GND	30	LCD_VCC
31	LCD_VCC	32	GND
33	GND	34	VCC_LEDK
35	VCC_LEDK	36
37		38	VCC_LEDA
39	VCC_LEDA	40	GND
41	GND

• MIPI CSI

Pin	Name	Pin	Name
1	GND	2	MIPI_CSI_RX_D0N
3	MIPI_CSI_RX_D0P	4	GND
5	MIPI_CSI_RX_D1N	6	MIPI_CSI_RX_D1P
7	GND	8	MIPI_CSI_RX_CLK0N
9	MIPI_CSI_RX_CLK0P	10	GND
11	CAMERAB_PDN_L_GPIO4_D2	12	REFCLK_OUT
13	I2C5_SCL_M0	14	I2C5_SDA_M0
15	VCC_CAM	16
17

SIM Card Slot

Pin	Name	Pin	Name
C1	GND	1	GND
C2	SIM1_RESET	2	GND
C3	SIM1_CLK	3	GND
C5	GND	4	GND
C6	GND	5	GND
C7	SIM1_DATA	6	GND
CD	SIM1_DET	7	GND
CD-	GND	8	GND
		9	GND
		10	GND

USB

• USB 2.0

Pin	Name	Pin	Name
1	VCC5V0_USB_HOST2	2	USB2_HOST2DM
3	USB2_HOST2DP	4	GND
5	VCC5V0_USB_HOST2	6	USB2_HOST3DM
7	USB2_HOST3DP	8
9	GND	10	GND
11	GND	12	GND

• USB 3.0

Pin	Name	Pin	Name
1	VCC5V0_USB_OTG0	2	USB3_OTG0DM
3	USB3_OTG0DP	4	GND
5	USB3_OTG0SSRXN	6	USB3_OTG0SSRXP
7	GND	8	USB3_OTG0SSTXN
9	USB3_OTG0SSTXP	10	GND
11	GND	12	VCC5V0_USB_HOST1
13	USB3_HOST1DM	14	USB3_HOST1DP
15	GND	16	USB3_HOST1SSRXN
17	USB3_HOST1SSRXP	18	GND
19	USB3_HOST1SSTXN	20	USB3_HOST1SSTXP
21	GND	22	GND

PCIe

• B Key

Pin	Name	Pin	Name
1		2	VCC3V3_PCIE30X1
3	GND	4	VCC3V3_PCIE30X1
5	GND	6	4G_PWREN_H_GPIO0_C6
7	USB2_HOST3_DP	8	4G_DISABLE_GPIO1_B0
9	USB2_HOST3_DM	10
11	GND
		20
21	GND	22
23	4G_WAKE_ON_HOST	24
25		26	GPIO2-D2
27	GND	28
29		30	SIM1_RESET
31		32	SIM1_CLK
33	GND	34	SIM1_DATA
35		36	SIM1_PWR
37		38
39	GND	40
41		42
43		44
45	GND	46
47		48
49		50
51	GND	52
53		54
55		56
57	GND	58
59		60
61		62
63		64
65		66	SIM1_DET
67	4G_RESET	68
69	GND	70	VCC3V3_PCIE30X1
71	GND	72	VCC3V3_PCIE30X1
73	GND	74	VCC3V3_PCIE30X1
75	GND	76
77	GND	78

• E Key

Pin	Name	Pin	Name
1	GND	2	VCC3V3_WF
3	USB4_Dp	4	VCC3V3_WF
5	USB4_DM	6
7	GND	8
9	SDMMC2_CLK_M0	10
11	WIFI1T1R_CMD	12
13	WIFI1T1R_D0	14
15	WIFI1T1R_D1	16
17	WIFI1T1R_D2	18
19	WIFI1T1R_D3	20	HOST_WAKE_BT_H_GPIO4_B5
21	WIFI_WAKE_HOST_H_GPIO3_D5	22	UART8_RX_M0
23
		32	UART8_CTS_M0
33		34	UART8_RTS_M0
35	SATA2_TXP	36
37	SATA2_TXN	38
39		40
41	SATA2_RXP	42
43	SATA2_RXN	44
45	GND	46
47	PCIE20_CLKP	48
49	PCIE20_CLKN	50	WIFIBT_32KIN_1T1R
51	GND	52	PCIE30X1_PERSTn_3V3_L
53	PCIE20-CLKREQN	54	BT_WAKE_HOST_H_GPIO4_B4
55	PCIE20-WAKEN	56
57	GND	58	I2C8_SDA
59		60	I2C8_SCL
61		62
63	GND	64
65		66
67		68
69	GND	70	BT_WAKE_HOST_H_GPIO4_B4
71		72	VCC3V3_WF
73		74	VCC3V3_WF
75	GND	76	GND
77	GND	78
79

• M Key

Pin	Name	Pin	Name
1	GND	2	VCC3V3_SYS2
3	GND	4	VCC3V3_SYS2
5		6
7		8
9	GND	10
11		12	VCC3V3_SYS2
13		14	VCC3V3_SYS2
15	GND	16	VCC3V3_SYS2
17		18	VCC3V3_SYS2
19		20
21	GND	22
23		24
25		26
27	GND	28
29	PCIE30_RX1N	30
31	PCIE30_RX1P	32
33	GND	34
35	PCIE30_TX1N	36
37	PCIE30_TX1P	38
39	GND	40
41	PCIE30_RX0N	42
43	PCIE30_RX0P	44
45	GND	46
47	PCIE30_TX0N	48
49	PCIE30_TX0P	50	PCIE30X2_LANE0_PERSTn_3V3_L
51	GND	52	PCIE30X2_LANE0_CLKREQn_3V3_L
53	PCIE30_REFCLKN_CON	54	PCIE30X2_LANE0_WAKEn_3V3_L
55	PCIE30_REFCLKP_CON	56
57	GND	58
67		68
69		70	VCC3V3_SYS2
71	GND	72	VCC3V3_SYS2
73	GND	74	VCC3V3_SYS2
75	GND