Pin Definition

The X3128BV3 uses the X3128CV4 144-pin castellated core board. The tables below list pins 1 to 144.

Core Board Pin Definition 1

Pin No.	Signal	Description
1	VCC_SYS	Core-board main power output, 4.2V
2	CIF_PDN0	GPIO3_D7, general-purpose GPIO
3	PWM0	GPIO0_D2，muxed as PWM0
4	PWM1	GPIO0_D3，muxed as PWM1
5	PWM2	GPIO0_D4，muxed as PWM2
6	UART0_RTS	GPIO0_C1，muxed as UART0
7	UART0_RXD	GPIO2_D3，muxed as UART0
8	UART0_CTS	GPIO2_D5，muxed as UART0
9	UART0_TXD	GPIO2_D2，muxed as UART0
10	IR_RX	GPIO3_D2, muxed as infrared receiving port
11	SPDIF_TX	GPIO3_D3, muxed as fiber output
12	TX_C-	HDMI differential pair
13	TX_C+	HDMI differential pair
14	TX_0-	HDMI differential pair
15	TX_0+	HDMI differential pair
16	TX_1-	HDMI differential pair
17	TX_1+	HDMI differential pair
18	TX_2-	HDMI differential pair
19	TX_2+	HDMI differential pair
20	VDAC_OUTP	DAC output
21	OTG_ID	OTG ID pin
22	OTG_DET	OTG detect pin
23	HOST_DP	HOST differential pair
24	HOST_DM	HOST differential pair
25	OTG_DP	OTG differential pair
26	OTG_DM	OTG differential pair
27	SDMMC_DET	SDMMC0 pin group
28	SDMMC_CMD	SDMMC0 pin group
29	SDMMC_D0	SDMMC0 pin group
30	SDMMC_D1	SDMMC0 pin group
31	SDMMC_D2	SDMMC0 pin group
32	SDMMC_D3	SDMMC0 pin group
33	SDMMC_CLK	SDMMC0 pin group
34	I2C3_SDA	GPIO0_A7，muxed as I2C3_SDA
35	I2C3_SCL	GPIO0_A6，muxed as I2C3_SCL
36	VCC_IO	3.3V DC-DC output

Core Board Pin Definition 2

Pin No.	Signal	Description
37	VCC_IO	3.3V DC-DC output
38	HDMI_HPD	GPIO0_B7，muxed as HDMI
39	HDMI_CEC	GPIO0_C4，muxed as HDMI1
40	UART1_TX	GPIO1_B1，muxed as UART1
41	UART1_RX	GPIO1_B2，muxed as UART1
42	UART1_RTS	GPIO1_B3，muxed as UART1
43	SPI_CLK	GPIO0_B1，muxed as SPI
44	SPI_CSn0	GPIO0_B6，muxed as SPI
45	SPI_TXD	GPIO0_B3，muxed as SPI
46	SPI_RXD	GPIO0_B5，muxed as SPI
47	SPI_CSn1	GPIO1_B4，muxed as SPI
48	SDMMC1_CLK	SDMMC1 data group
49	SDMMC1_D3	SDMMC1 data group
50	SDMMC1_D2	SDMMC1 data group
51	SDMMC1_D1	SDMMC1 data group
52	SDMMC1_D0	SDMMC1 data group
53	SDMMC_PWR	SDMMC1 data group
54	I2C1_SDA/SDMMC1_CMD	SDMMC1 data group，muxed as I2C1
55	I2C1_SCL	GPIO0_A2，muxed as I2C1
56	I2C0_SCL	GPIO0_A0，muxed as I2C0
57	I2C0_SDA	GPIO0_A1，muxed as I2C0
58	GSENSOR_INT	GPIO0_B4, muxed as I2S interface
59	TP_INT	GPIO1_B0，muxed as UART1
60	SPK_CTL	GPIO0_D6, general-purpose GPIO
61	TP_RST	GPIO0_D1, utilizing UART2
62	HP_CTL	GPIO3_C4, general-purpose GPIO
63	LCD_RST	GPIO0_D0，muxed as UART2
64	GPIO3_C7	GPIO3_C7, general-purpose GPIO
65	GPIO1_C7	GPIO1_C7, general-purpose GPIO
66	GPIO2_A2	GPIO2_A2, general-purpose GPIO
67	GPIO1_A7	GPIO1_A7, general-purpose GPIO
68	GPIO2_A0	GPIO2_A0，muxed as SPI
69	GPIO2_A1	GPIO2_A1, general-purpose GPIO
70	GPIO0_C7	GPIO0_C7, general-purpose GPIO
71	GPIO2_A6	GPIO2_A6, general-purpose GPIO
72	GND	GND

Core Board Pin Definition 3

Pin No.	Signal	Description
73	GND	Ground
74	GPIO2_A4	GPIO2_A4, general-purpose GPIO
75	GPIO3_C6	GPIO3_C6, general-purpose GPIO
76	GPIO2_A3	GPIO2_A3, general-purpose GPIO
77	GPIO1_A3	GPIO1_A3，muxed as I2S
78	GPIO3_C5	GPIO3_C5, general-purpose GPIO
79	CODEC_AOL	Audio output
80	CODEC_AOR	Audio output
81	MICBIAS	MIC bias
82	MICIN-P	Audio input
83	MICIN-N	Audio input
84	HP_DET	Headphone detect pin
85	LCD_D23	GPIO2_D1，muxed as LCD，MAC
86	LCD_D22	GPIO2_D0，muxed as LCD，MAC
87	LCD_D21	GPIO2_C7，muxed as LCD，MAC
88	LCD_D20	GPIO2_C6，muxed as LCD，MAC
89	I2C2_SCL_LCD_19	GPIO2_C5，muxed as LCD，MAC，I2C2
90	I2C2_SDA_LCD_18	GPIO2_C4，muxed as LCD，MAC，I2C2
91	LCD_D17	GPIO2_C3，muxed as LCD，MAC
92	LCD_D16	GPIO2_C2，muxed as LCD，MAC
93	LCD_D15	GPIO2_C1，muxed as LCD，MAC
94	LCD_D14	GPIO2_C0，muxed as LCD，MAC
95	LCD_D13	GPIO2_B7，muxed as LCD，MAC
96	LCD_D12	GPIO2_B6，muxed as LCD，MAC
97	LCD_D11	GPIO2_B5，muxed as LCD，MAC
98	LCD_D10	GPIO2_B4，muxed as LCD，MAC
99	LCD_D9	muxed as RGB, LVDS, MIPI port, cannot be used as independent GPIO
100	LCD_D8	muxed as RGB, LVDS, MIPI port, cannot be used as independent GPIO
101	LCD_D7	muxed as RGB, LVDS, MIPI port, cannot be used as independent GPIO
102	LCD_D6	muxed as RGB, LVDS, MIPI port, cannot be used as independent GPIO
103	LCD_D5	muxed as RGB, LVDS, MIPI port, cannot be used as independent GPIO
104	LCD_D4	muxed as RGB, LVDS, MIPI port, cannot be used as independent GPIO
105	LCD_D3	muxed as RGB, LVDS, MIPI port, cannot be used as independent GPIO
106	LCD_D2	muxed as RGB, LVDS, MIPI port, cannot be used as independent GPIO
107	LCD_D1	muxed as RGB, LVDS, MIPI port, cannot be used as independent GPIO
108	LCD_D0	muxed as RGB, LVDS, MIPI port, cannot be used as independent GPIO

Core Board Pin Definition 4

Pin No.	Signal	Description
109	GND	Ground
110	GND	Ground
111	LCD_HSYNC	GPIO2_B1，muxed as LCD
112	LCD_VSYNC	GPIO2_B2，muxed as LCD
113	LCD_CLK	GPIO2_B0，muxed as LCD
114	LCD_DEN	GPIO2_B3，muxed as LCD
115	VCC_RK816IN	Core board power input, 4.8 to 5.5V
116	VCC_RK816IN	Core board power input, 4.8 to 5.5V
117	VCC_RK816IN	Core board power input, 4.8 to 5.5V
118	PWRON	PMU power-on pin, active low
119	VCC_RTC	RTC power input pin, 3V
120	BAT_P	Battery input pin
121	BAT_N	Battery input pin
122	RTC_CLKOUT	32768Hz clock output
123	VCC28_CIF	PMU LDO1 output, adjustable voltage
124	VCC18_CIF	PMU LDO2 output, adjustable voltage
125	VCC_TP	PMU LDO6 output, adjustable voltage
126	VCCA_CODEC	PMU LDO5 output, adjustable voltage
127	RESET	CPU reset pin, active low
128	ADCIN2	ADC input pin, 3.3V reference
129	ADCIN1	ADC input pin, 3.3V reference
130	ADCIN0	ADC input pin, 3.3V reference
131	CIF_CLKOUT	BT656 / BT601 camera data signal, cannot be used as normal GPIO
132	CIF_CLKIN	BT656 / BT601 camera data signal, cannot be used as normal GPIO
133	CIF_HREF	BT656 / BT601 camera data signal, cannot be used as normal GPIO
134	CIF_VSYNC	BT656 / BT601 camera data signal, cannot be used as normal GPIO
135	CIF_D7	BT656 / BT601 camera data signal, cannot be used as normal GPIO
136	CIF_D6	BT656 / BT601 camera data signal, cannot be used as normal GPIO
137	CIF_D5 /	BT656 / BT601 camera data signal, cannot be used as normal GPIO
138	CIF_D4	BT656 / BT601 camera data signal, cannot be used as normal GPIO
139	CIF_D3	BT656 / BT601 camera data signal, cannot be used as normal GPIO
140	CIF_D2	BT656 / BT601 camera data signal, cannot be used as normal GPIO
141	CIF_D1	BT656 / BT601 camera data signal, cannot be used as normal GPIO
142	CIF_D0	BT656 / BT601 camera data signal, cannot be used as normal GPIO
143	CIF_PDN1	GPIO3_D7, general-purpose GPIO
144	VCC_SYS	Core-board main power output