Pin Definition

The X6818CV3 core board is downward compatible with X4418CV3, and the core-board pin definition is the same. The tables below preserve the pin definitions and expansion connector definitions from the hardware manual for carrier-board design, wiring verification, interface debugging, and device-tree pin-mux checks.

note

X6818 has many interface resources. LCD, LVDS, MIPI, Camera, UART, SPI, ADC, and GPIO may have pin-mux or board-level connection dependencies. Check hardware connections and pin-mux conflicts before modifying the carrier board or device tree.

Core Board Pin Definition 1

Pin No.	Signal	Pin No.	Signal
1	LCD_PWM	28	LCD_CLK
2	LCD_EN	29	LCD_DE
3	LCD_RESET	30	LCD_HSYNC
4	LCD_R0	31	LCD_VSYNC
5	LCD_R1	32	ALIVEGPIO5
6	LCD_R2	33	MCU_SDA_0
7	LCD_R3	34	MCU_SCL_0
8	LCD_R4	35	MCU_HDMI_CEC
9	LCD_R5	36	MCU_HDMI_HPD
10	LCD_R6	37	MCU_HDMI_TXCN
11	LCD_R7	38	MCU_HDMI_TXCP
12	LCD_G0	39	MCU_HDMI_TX0N
13	LCD_G1	40	MCU_HDMI_TX0P
14	LCD_G2	41	MCU_HDMI_TX1N
15	LCD_G3	42	MCU_HDMI_TX1P
16	LCD_G4	43	MCU_HDMI_TX2N
17	LCD_G5	44	MCU_HDMI_TX2P
18	LCD_G6	45	GND
19	LCD_G7	46	MCU_LVDS_CLKM
20	LCD_B0	47	MCU_LVDS_CLKM
21	LCD_B1	48	MCU_LVDS_Y3M
22	LCD_B2	49	MCU_LVDS_Y3P
23	LCD_B3	50	MCU_LVDS_Y2M
24	LCD_B4	51	MCU_LVDS_Y2P
25	LCD_B5	52	MCU_LVDS_Y1M
26	LCD_B6	53	MCU_LVDS_Y1P
27	LCD_B7	54	MCU_LVDS_Y0M

Core Board Pin Definition 2

Pin No.	Signal	Pin No.	Signal
55	MCU_LVDS_Y0P	73	MIPICSI_DN0
56	MIPIDSI_DP3	74	MIPICSI_DP0
57	MIPIDSI_DN3	75	MIPICSI_DNCLK
58	MIPIDSI_DP2	76	MIPICSI_DPCLK
59	MIPIDSI_DN2	77	CAM_H
60	MIPIDSI_DP1	78	CAM_V
61	MIPIDSI_DN1	79	CAM_CLK
62	MIPIDSI_DP0	80	CAM_D0
63	MIPIDSI_DN0	81	CAM_D1
64	MIPIDSI_DPCLK	82	CAM_D2
65	MIPIDSI_DNCLK	83	CAM_D3
66	MIPIDSI_VREG	84	CAM_D4
67	MIPICSI_DN3	85	CAM_D5
68	MIPICSI_DP3	86	CAM_D6
69	MIPICSI_DN2	87	CAM_D7
70	MIPICSI_DP2	88	MCU_CAM1_MCLK
71	MIPICSI_DN1	89	CAM_PN
72	MIPICSI_DP1	90	CAM_RST

Core Board Pin Definition 3

Pin No.	Signal	Pin No.	Signal
91	CAM_PD	118	UARTTXD1
92	GPIOB8	119	UARTRXD0
93	MCU_CAM1_D7	120	UARTTXD0
94	MCU_CAM1_D4	121	GND
95	MCU_CAM1_D3	122	VBAT
96	MCU_CAM1_D2	123	VBAT
97	MCU_CAM1_D1	124	+5V_IN
98	MCU_CAM1_D0	125	+5V_IN
99	MCU_I2S_MCLK	126	VBAT_SYS
100	MCU_I2S_BCK	127	GND
101	MCU_I2S_SDIN	128	LINK_LED
102	MCU_I2S_SDOUT	129	SPEED_LED
103	MCU_I2S_LRCK	130	MDI0_P
104	MCU_HP_DET	131	MDI0_N
105	SPDIF_TX	132	MDI1_P
106	SPDIF_RX	133	MDI1_N
107	MCU_KEY_VOLDN	134	MDI2_P
108	MCU_KEY_VOLUP	135	MDI2_N
109	MCU_NRESETIN	136	MDI3_P
110	MCU_PWRKEY	137	MDI3_N
111	GPIOA28	138	USBHSIC_DATA
112	GPIOB9	139	USBHSIC_STROBE
113	UARTRXD3	140	USB_HOST_D-
114	UARTTXD3	141	USB_HOST_D+
115	UARTRXD2	142	OTG_USB-
116	UARTTXD2	143	OTG_USB+
117	UARTRXD1	144	USB_ID

Core Board Pin Definition 4

Pin No.	Signal	Pin No.	Signal
145	DC5V_OTG	163	MCU_SD1_D0
146	SEN0_INT	164	MCU_SD1_D1
147	MCU_OTG_PWRON	165	MCU_SD1_D2
148	GPIOC11	166	MCU_SD1_D3
149	GPIOC7	167	MCU_SD0_CD
150	GPIOC12	168	MCU_SD0_D3
151	ADC1	169	MCU_SD0_D2
152	ADC0	170	MCU_SD0_D1
153	PWM2	171	MCU_SD0_D0
154	SPI_WP	172	MCU_SD0_CMD
155	SPIFRM0	173	MCU_SD0_CLK
156	SPIRXD0	174	RTC
157	SPITXD0	175	VCC3P3_SYS
158	SPICLK0	176	MCU_SCL_2
159	IR	177	MCU_SDA_2
160	MCU_SD1_CD	178	MCU_SCL_1
161	MCU_SD1_CLK	179	MCU_SDA_1
162	MCU_SD1_CMD	180	TOUCH_INT

J12: MIPI DSI Expansion Connector

Pin	Signal	Pin	Signal
1	VCC3P3_SYS	11	MIPIDSI_DN2
2	LVDS_VDD	12	MIPIDSI_DP2
3	MCU_SCL_1	13	GND
4	MCU_BACKLIGHT_PWM	14	GND
5	MCU_SDA_1	15	MIPIDSI_DNCLK
6	CAP_INT	16	MIPIDSI_DPCLK
7	MIPIDSI_DN0	17	MCU_NRESETOUT
8	MIPIDSI_DP0	18	GND
9	MIPIDSI_DN1	19	MIPIDSI_DN3
10	MIPIDSI_DP1	20	MIPIDSI_DP3

J13: SPI / UART / ADC / GPIO Expansion Connector

Pin	Signal	Pin	Signal
1	DCIN	11	MCU_SPIRXD0
2	GND	12	GPIOB0
3	DCIN	13	MCU_SPITXD0
4	GND	14	GPIOB2
5	VCC3P3_SYS	15	SPDIF_RX
6	GND	16	GPIOB4
7	ADC1	17	SPDIF_TX
8	ADC0	18	GPIOB6
9	MCU_SPIFRM0	19	ALIVEGPIO5
10	GPIOA30	20	GPIOB10

J39: LVDS Expansion Connector

Pin	Signal	Pin	Signal
1	LVDS_VDD	16	MCU_LVDS_CLKP
2	LVDS_VDD	17	MCU_LVDS_CLKM
3	LVDS_VDD	18	GND
4	VCC3P3_SYS	19	MCU_LVDS_Y3P
5	VCC3P3_SYS	20	MCU_LVDS_Y3M
6	GND	21	GND
7	MCU_LVDS_Y0P	22	NC
8	MCU_LVDS_Y0M	23	NC
9	GND	24	GND
10	MCU_LVDS_Y1P	25	PWM0
11	MCU_LVDS_Y1M	26	NC
12	GND	27	CAP_INT
13	MCU_LVDS_Y2P	28	MCU_SCL_1
14	MCU_LVDS_Y2M	29	MCU_SDA_1
15	GND	30	GPIOC11

U451: Parallel Camera Connector

Pin	Signal	Pin	Signal
1	CAM_PN	13	CAM_CLKOUT
2	AGND	14	CAM_D6
3	SIOD(I2C_SDA)	15	GND
4	CAM_2.8V	16	CAM_D5
5	SIOC(I2C_SCL)	17	CAM_PCLK
6	RESET(CAM_RST)	18	CAM_D4
7	CAM_V	19	CAM_D0
8	CAM_PD	20	CAM_D3
9	CAM_H	21	CAM_D1
10	CAM_1.8V	22	CAM_D2
11	CAM_2.8V	23	NC
12	CAM_D7	24	AFVDD_2.8V

J15: MIPI CSI Connector

Pin	Signal	Pin	Signal
1	GND	14	NC
2	MIPICSI_DPCLK	15	NC
3	MIPICSI_DNCLK	16	GND
4	GND	17	MCU_SDA_0
5	MIPICSI_DP0	18	MCU_SCL_0
6	MIPICSI_DN0	19	RST
7	GND	20	CAM_PN
8	MIPICSI_DP1	21	MCU_CAM1_MCLK
9	MIPICSI_DN1	22	CAM_1.8V
10	GND	23	CAM_2.8V
11	NC	24	CAM_2.8V
12	NC	25	MIPI_1.2V
13	GND	26	GND

LCD1: LCD / VGA Connector

Pin	Signal	Pin	Signal
1	BACKLIGHT_PWM	21	L_B0
2	LVDS_VDD	22	L_B1
3	GND	23	L_B2
4	VCC3P3_SYS	24	L_B3
5	L_R0	25	L_B4
6	L_R1	26	L_B5
7	L_R2	27	L_B6
8	L_R3	28	L_B7
9	L_R4	29	GND
10	L_R5	30	L_DCLK
11	L_R6	31	LCD_EN
12	L_R7	32	L_HSYNC
13	L_G0	33	L_VSYNC
14	L_G1	34	DE
15	L_G2	35	NC
16	L_G3	36	GND
17	L_G4	37	TP_SCL
18	L_G5	38	TP_SDA
19	L_G6	39	CAP_WAKE
20	L_G7	40	CAP_INT

J42: Power Output Connector

Pin	Signal	Pin	Signal
1	DCIN（5V）	6	GND
2	GND	7	DCIN（5V）
3	DCIN（5V）	8	GND
4	GND	9	DCIN（5V）
5	DCIN（5V）	10	GND

Key Definition

Key	Function	Key	Function
K1	Return	K4	Menu
K2	Volume up	RESET	Reset
K3	Volume down	POWER	Power