MITO 8M Nano SOM/MITO 8M Nano Hardware/pdf

General Information

MITO 8M Nano Block Diagram

MITO 8M Nano Block diagram

MITO 8M Nano TOP View

MITO 8M Nano TOP View

MITO 8M Nano BOTTOM View

MITO 8M Nano BOTTOM View

Processor and memory subsystem

The heart of MITO 8M Nano module is composed by the following components:

• i.MX8M Nano SoC application processor
• Power supply unit
• LPDDR4 memory bank
• eMMC or NAND flash banks
• Connectors:
  • 1 x 204 pins SO-DIMM edge connector with interfaces signals
    • partially compatible with AXEL Lite SOM

This chapter shortly describes the main MITO 8M Nano components.

Processor Info

Table: i.MX8M Nano models comparison

Processor	i.MX8M Nano Solo	i.MX8M Nano Dual	i.MX8M Nano Quad
# Cores	1x Arm® Cortex®-A53 1x Arm® Cortex®-M7	2x Arm® Cortex®-A53 1x Arm® Cortex®-M7	4x Arm® Cortex®-A53 1x Arm® Cortex®-M7
Clock	1.4 GHz (Industrial) 1.5 GHz (Commercial)
L2 Cache	1 MB
LPDDR4	16 bit @ 1600 MHz (LPDDR4-3200)
GPU	Vivante GC 7000UL (2 Shader) OpenGL ES 3.1 Vulkan Open VG 1.1 Open CL 1.2
Display Controller	Dual Independent LVDS channel Display Support up to 1080p60
Video Output	1x MIPI-DSI (with MIPI to LVDS bridge)
Camera Input	1x MIPI CSI (4-lanes)
USB	2x USB 2.0 OTG

RAM memory bank

LPDD4 SDRAM memory bank is composed by 1x 16-bit width chip. The following table reports the SDRAM specifications:

CPU connection	Multi-mode DDR controller (MMDC)
Size max	4 GB
Width	16 bit
Speed	1600 MHz

eMMC flash bank

On board main storage memory eMMC is connected to the SDIO1 interface and it can act as boot peripheral. The following table reports the eMMC flash specifications:

CPU connection	SDIO1
Size min	4 GB
Size max	64 GB
Bootable	Yes

NAND flash bank

Not available yet

Alternative option for main storage memory can be a 8-bit wide NAND flash connected to the CPU's Raw NAND flash controller. It can act as boot peripheral. The following table reports the NAND flash specifications:

CPU connection	Raw NAND flash controller
Page size	512 byte, 2 kbyte or 4 kbyte
Size min	512MB
Size max	2GB
Width	8 bit
Chip select	NANC_CE0
Bootable	Yes

Memory map

For detailed information, please refer to chapter 2 “Memory Maps” of the i.MX8M Nano Applications Processor Reference Manual

Power supply unit

MITO 8M Nano embeds all the elements required for powering the unit, therefore power sequencing is self-contained and simplified. Nevertheless, power must be provided from carrier board, and therefore users should be aware of the ranges power supply can assume as well as all other parameters.

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Part number composition

MITO 8M Nano SOM module part number is identified by the following digit-code table:

Part number structure	Options	Description
Family	DMN	Family prefix code
SOC	A: NXP i.MX8M Nano Quad Industrial grade (Tj: -40/105°C) @ 1.4GHz B: NXP i.MX8M Nano Quad Commercial grade (Tj: 0/95°C) @ 1.5GHz C: NXP i.MX8M Nano Dual Lite Industrial grade (Tj: -40/105°C) @ 1.4GHz D: NXP i.MX8M Nano Dual Industrial grade (Tj: -40/105°C) @ 1.4GHz E: NXP i.MX8M Nano Quad Lite Industrial grade (Tj: -40/105°C) @ 1.4GHz F: NXP i.MX8M Nano Quad Lite Commercial grade (Tj: 0/95°C) @ 1.5GHz G: NXP i.MX8M Nano Solo Industrial grade (Tj: -40/105°C) @ 1.4GHz	Other versions can be available, please contact technical support
RAM Flash	4: 2GB DDR4 2: 2GB DDR4 1: 1GB DDR4
Storage	0: No storage 1: 2GB NAND SLC 2: 4GB eMMC 3: 8GB eMMC 4: 16GB eMMC, No QSPI, No NAND	NAND SLC and eMMC are possible alternatives not available together. Other sizes can be available, please contact technical support
Boot options	0: Boot from on board eMMC 1: Boot from on board NAND	These options depend on storage version selected. Other versions can be available, please contact technical support
VIN Range	0: 3.3V fixed 1: 3.8V - 5.5V
RFU	0:RFU	Reserved for Future Use
Temperature range	C - Commercial grade: 0-70°C I - Industrial: -40 - 85°C	For the DAVE Embedded Systems' product Temperature Range classification, please find more information at the page Products Classification
PCB revision	0: first version	PCB release may change for manufacturing purposes (i.e. text fixture adaptation)
Manufacturing option	R: RoHS
Software Configuration	-00: standard factory u-boot pre-programmed	If customers require custom SW deployed this section should be defined and agreed. please contact technical support

Example

MITO 8M Nano SOM code DMNA22000C0R-00

• DMN - MITO 8M Nano
• A - NXP i.MX8M Nano Quad Industrial grade (Tj: -40/105°C) @ 1.4GHz
• 2 - 2GB DDR4
• 2 - 4GB eMMC
• 0 - Boot from on board eMMC
• 0 - 3.3V fixed
• 0 - RFU
• C - Commercial grade: for 0-70°C
• 0 - first version
• R - RoHS
• -00 - standard factory u-boot pre-programmed

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Pinout Table

Connectors and Pinout Table description

Connectors description

In the following table are described all available connectors integrated on MITO 8M Nano SOM:

Connector name	Connector Type	Notes	Carrier board counterpart
J1	SODIMM edge connector 204 pin	partially compatible with AXEL Lite SOM	TE Connectivity 2-2013289-1

The dedicated carrier board must mount the mating connector and connect the desired peripheral interfaces according to MITO 8M Nano pinout specifications. See the images below for reference:

MITO 8M Mini/Nano TOP view

MITO 8M Mini/Nano BOTTOM view

Below a detailed description of the pinout, grouped in the following tables:

• two tables (ODD and EVEN pins) that report the pin mapping of the 204-pin SO-DIMM edge

Pinout Table description

Each row in the pinout tables contains the following information:

Pin	Reference to the connector pin
Pin Name	Pin (signal) name on the MITO 8M Nano connectors
Internal connections	Connections to the components CPU.<x> : pin connected to CPU pad (NXP iMX8MM) PMIC.<x> : pin connected to the Power Manager IC (NXP PF8121) LAN.<x> : pin connected to the LAN PHY (MICROCHIP KSZ9031RNX) BRIDGE.<x>  : pin connected to the MIPI-to-LVDS bridge (TI SN65DSI84)
Ball/pin #	Component ball/pin number connected to signal
Voltage	I/O voltage levels
Type	Pin type: I = Input O = Output D = Differential Z = High impedance S = Power supply voltage G = Ground A = Analog signal
Notes	Remarks on special pin characteristics
Pin MUX alternative functions	Muxes: Pin ALT-0 Pin ALT-1 Pin ALT-2 Pin ALT-3 Pin ALT-4 Pin ALT-5 Pin ALT-6 Pin ALT-7 Pin ALT-8

SODIMM J1 ODD pins declaration

Pin	Pin Name	Internal Connections	Ball/pin #	Voltage domain	Type	Notes	Alternative Functions
J1.1	DGND	DGND	-	-	G
J1.3	3.3VIN	INPUT VOLTAGE	-	3.3VIN	S
J1.5	3.3VIN	INPUT VOLTAGE	-	3.3VIN	S
J1.7	3.3VIN	INPUT VOLTAGE	-	3.3VIN	S
J1.9	3.3VIN	INPUT VOLTAGE	-	3.3VIN	S
J1.11	DGND	DGND	-	-	G
J1.13	ETH0_LED1	LAN.LED1/PME_N1	17	NVCC_1V8	I/O	Must be level translated if used @ 3V3 Internally pulled-up to 1.8V during bootstrap
J1.15	ETH0_LED2	LAN.LED2	15	NVCC_1V8	I/O	Must be level translated if used @ 3V3 Internally pulled-up to 1.8V during bootstrap
J1.17	DGND	DGND	-	-	G
J1.19	ETH0_TXRX0_P	LAN.TXRXP_A	2	-	D
J1.21	ETH0_TXRX0_M	LAN.TXRXM_A	3	-	D
J1.23	ETH0_TXRX1_P	LAN.TXRXP_B	5	-	D
J1.25	ETH0_TXRX1_M	LAN.TXRXM_B	6	-	D
J1.27	ETH0_TXRX2_P	LAN.TXRXP_C	7	-	D
J1.29	ETH0_TXRX2_M	LAN.TXRXM_C	8	-	D
J1.31	ETH0_TXRX3_P	LAN.TXRXP_D	10	-	D
J1.33	ETH0_TXRX3_M	LAN.TXRXM_D	11	-	D
J1.35	DGND	DGND	-	-	G
J1.37	GPIO1_IO00	CPU.GPIO1_IO00	AG14	NVCC_3V3	I/O		ALT0	GPIO1_IO00
							ALT1	CCM_ENET_PHY_REF_CLK_ROOT
							ALT5	CCM_REF_CLK_32K
							ALT6	CCM_EXT_CLK1
J1.39	GPIO1_IO01	CPU.GPIO1_IO01	AF14	NVCC_3V3	I/O	Internally used for ETH PHY reset, do not connect	ALT0	GPIO1_IO01
							ALT1	PWM1_OUT
							ALT5	CCM_REF_CLK_24M
							ALT6	CCM_EXT_CLK2
J1.41	SPDIF_EXT_CLK	CPU.SPDIF_EXT_CLK	AF8	NVCC_3V3	I/O		ALT0	SPDIF1_EXT_CLK
							ALT1	PWM1_OUT
							ALT5	GPIO5_IO05
J1.43	GPIO1_IO13	CPU.GPIO1_IO13	AD9	NVCC_3V3	I/O		ALT0	GPIO1_IO13
							ALT1	USB1_OTG_OC
							ALT5	PWM2_OUT
J1.45	GPIO1_IO11	CPU.GPIO1_IO11	AC10	NVCC_3V3	I/O	Internally used for ETH CLK enable, do not connect	ALT0	GPIO1_IO11
							ALT1	USB1_OTG_ID
J1.47	ECSPI2_SCLK	CPU.ECSPI2_SCLK	E6	NVCC_3V3	I/O		ALT0	ECSPI2_SCLK
							ALT1	UART4_RX
							ALT5	GPIO5_IO10
J1.49	ECSPI2_MOSI	CPU.ECSPI2_MOSI	B8	NVCC_3V3	I/O		ALT0	ECSPI2_MOSI
							ALT1	UART4_TX
							ALT5	GPIO5_IO11
J1.51	GPIO1_IO08	CPU.GPIO1_IO08	AG10	NVCC_3V3	I/O		ALT0	GPIO1_IO08
							ALT1	ENET1_1588_EVENT0_IN
							ALT5	USDHC2_RESET_B
J1.53	GPIO1_IO09	CPU.GPIO1_IO09	AF10	NVCC_3V3	I/O		ALT0	GPIO1_IO09
							ALT1	ENET1_1588_EVENT0_OUT
							ALT4	USDHC3_RESET_B
							ALT5	SDMA2_EXT_EVENT0
J1.55	ECSPI2_MISO	CPU.ECSPI2_MISO	A8	NVCC_3V3	I/O		ALT0	ECSPI2_MISO
							ALT1	UART4_CTS_B
							ALT5	GPIO5_IO12
J1.57	DGND	DGND	-	-	G
J1.59	ECSPI2_SS0	CPU.ECSPI2_SS0	A6	NVCC_3V3	I/O		ALT0	ECSPI2_SS0
							ALT1	UART4_RTS_B (Configure register IOMUXC_UART4_RTS_B_SELECT_INPUT for mode ALT1)
							ALT5	GPIO5_IO13
J1.61	GPIO1_IO05	CPU.GPIO1_IO05	AF12	NVCC_3V3	I/O	Internally used for MIPI-to-LVDS interrupt, do not connect Pulled-up to NVCC_3V3	ALT0	GPIO1_IO05
							ALT1	M4_NMI
							ALT5	CCM_PMIC_READY
J1.63	SAI5_RXD0	CPU.SAI5_RXD0	AD18	NVCC_3V3	I/O		ALT0	SAI5_RX_DATA0 ( Configure register IOMUXC_SAI5_RX_DATA_SELECT_INPUT_0 for mode ALT0)
							ALT1	SAI1_TX_DATA2
							ALT4	PDM_BIT_STREAM0 (Configure register IOMUXC_PDM_BIT_STREAM_SELECT_INPUT_0 for mode ALT4)
							ALT5	GPIO3_IO21
J1.65	SAI5_RXD1	CPU.SAI5_RXD1	AC14	NVCC_3V3	I/O		ALT0	SAI5_RX_DATA1 (Configure register IOMUXC_SAI5_RX_DATA_SELECT_INPUT_1 for mode ALT0)
							ALT1	SAI1_TX_DATA3
							ALT2	SAI1_TX_SYNC (Configure register IOMUXC_SAI1_TX_SYNC_SELECT_INPUT for mode ALT2)
							ALT3	SAI5_TX_SYNC (Configure register IOMUXC_SAI5_TX_SYNC_SELECT_INPUT for mode ALT3)
							ALT4	PDM_BIT_STREAM1 (Configure register IOMUXC_PDM_BIT_STREAM_SELECT_INPUT_1 for mode ALT4)
							ALT5	GPIO3_IO22
J1.67	GPIO1_IO06	CPU.GPIO1_IO06	AG11	NVCC_3V3	I/O	Internally used for MIPI-to-LVDS enable, do not connect	ALT0	GPIO1_IO06
							ALT1	ENET1_MDC
							ALT5	USDHC1_CD_B
							ALT6	CCM_EXT_CLK3
J1.69	SAI2_RXC	CPU.SAI2_RXC	AB22	NVCC_3V3	I/O		ALT0	SAI2_RX_BCLK
							ALT1	SAI5_TX_BCLK (Configure register IOMUXC_SAI5_TX_BCLK_SELECT_INPUT for mode ALT1)
							ALT4	UART1_RX
							ALT5	GPIO4_IO22
J1.71	SAI2_RXFS	CPU.SAI2_RXFS	AC19	NVCC_3V3	I/O		ALT0	SAI2_RX_SYNC
							ALT1	SAI5_TX_SYNC (Configure register IOMUXC_SAI5_TX_SYNC_SELECT_INPUT for mode ALT1)
							ALT2	SAI5_TX_DATA1
							ALT3	SAI2_RX_DATA1
							ALT4	UART1_TX
							ALT5	GPIO4_IO21
J1.73	DGND	DGND	-	-	G
J1.75	SD2_DATA0	CPU.SD2_DATA0	AB23	NVCC_3V3	I/O		ALT0	USDHC2_DATA0
							ALT5	GPIO2_IO15
J1.77	SD2_DATA1	CPU.SD2_DATA1	AB24	NVCC_3V3	I/O		ALT0	USDHC2_DATA1
							ALT5	GPIO2_IO16
J1.79	SD2_DATA2	CPU.SD2_DATA2	V24	NVCC_3V3	I/O		ALT0	USDHC2_DATA2
							ALT5	GPIO2_IO17
J1.81	SD2_DATA3	CPU.SD2_DATA03	V23	NVCC_3V3	I/O		ALT0	USDHC2_DATA3
							ALT5	GPIO2_IO18
J1.83	SD2_CMD	CPU.SD2_CMD	W24	NVCC_3V3	I/O		ALT0	USDHC2_CMD
							ALT5	GPIO2_IO14
J1.85	SD2_CLK	CPU.SD2_CLK	W23	NVCC_3V3	I/O		ALT0	USDHC2_CLK
							ALT5	GPIO2_IO13
J1.87	DGND	DGND	-	-	G
J1.89	UART3_TXD	CPU.UART3_TXD	D18	NVCC_3V3	I/O	Internally pulled-up to NVCC_3V3	ALT0	UART3_TX
							ALT1	UART1_RTS_B (Configure register IOMUXC_UART1_RTS_B_SELECT_INPUT for mode ALT1)
							ALT2	USDHC3_VSELECT
							ALT5	GPIO5_IO27
J1.91	UART3_RXD	CPU.UART3_RXD	E18	NVCC_3V3	I/O		ALT0	UART3_RX
							ALT1	UART1_CTS_B
							ALT2	USDHC3_RESET_B
							ALT5	GPIO5_IO26
J1.93	UART1_TXD	CPU.UART1_TXD	F13	NVCC_3V3	I/O		ALT0	UART1_TX
							ALT1	ECSPI3_MOSI
							ALT5	GPIO5_IO23
J1.95	UART1_RXD	CPU.UART1_RXD	E14	NVCC_3V3	I/O		ALT0	UART1_RX
							ALT1	ECSPI3_SCLK
							ALT5	GPIO5_IO22
J1.97	SD2_WP	CPU.SD2_WP	AA27	NVCC_3V3	I/O		ALT0	USDHC2_WP
							ALT5	GPIO2_IO20
J1.99	SD2_RST_B	CPU.SD2_RESET_B	AB26	NVCC_3V3	I/O		ALT0	USDHC2_RESET_B
							ALT5	GPIO2_IO19
J1.101	I2C2_SCL	CPU.I2C2_SCL	D10	NVCC_3V3	I/O		ALT0	I2C2_SCL
							ALT1	ENET1_1588_EVENT1_IN
							ALT2	USDHC3_CD_B (Configure register IOMUXC_USDHC3_CD_B_SELECT_INPUT for mode ALT2)
							ALT5	GPIO5_IO16
J1.103	I2C2_SDA	CPU.I2C2_SDA	D9	NVCC_3V3	I/O		ALT0	I2C2_SDA
							ALT1	ENET1_1588_EVENT1_OUT
							ALT2	USDHC3_WP (Configure register IOMUXC_USDHC3_WP_SELECT_INPUT for mode ALT2)
							ALT5	GPIO5_IO17
J1.105	SAI1_RXD3	CPU.SAI1_RXD3	AF17	NVCC_3V3	I/O	Internally used for BOOT mode configuration: can be pulled-up or down depending on MITO 8M Nano SOM P/N composition	ALT0	SAI1_RX_DATA3
							ALT1	SAI5_RX_DATA3 (Configure register IOMUXC_SAI5_RX_DATA_SELECT_INPUT_3 for mode ALT1)
							ALT3	PDM_BIT_STREAM3 (Configure register IOMUXC_PDM_BIT_STREAM_SELECT_INPUT_3 for mode ALT3)
							ALT4	CORESIGHT_TRACE3
							ALT5	GPIO4_IO05
							ALT6	SRC_BOOT_CFG3
J1.107	SAI1_TXD3	CPU.SAI1_TXD3	AF21	NVCC_3V3	I/O	Internally used for BOOT mode configuration: can be pulled-up or down depending on MITO 8M Nano SOM P/N composition	ALT0	SAI1_TX_DATA3
							ALT1	SAI5_TX_DATA3
							ALT4	CORESIGHT_TRACE11
							ALT5	GPIO4_IO15
							ALT6	SRC_BOOT_CFG11
J1.109	DGND	DGND	-	-	G
J1.111	SAI1_TXFS	CPU.SAI1_TXFS	AB19	NVCC_3V3	I/O		ALT0	SAI1_TX_SYNC (Configure register IOMUXC_SAI1_TX_SYNC_SELECT_INPUT for mode ALT0)
							ALT1	SAI5_TX_SYNC (Configure register IOMUXC_SAI5_TX_SYNC_SELECT_INPUT for mode ALT1)
							ALT4	CORESIGHT_EVENTO
							ALT5	GPIO4_IO10
J1.113	SAI1_TXC	CPU.SAI1_TXC	AC18	NVCC_3V3	I/O		ALT0	SAI1_TX_BCLK (Configure register IOMUXC_SAI1_TX_BCLK_SELECT_INPUT for mode ALT0)
							ALT1	SAI5_TX_BCLK (Configure register IOMUXC_SAI5_TX_BCLK_SELECT_INPUT for mode ALT1)
							ALT4	CORESIGHT_EVENTI
							ALT5	GPIO4_IO11
J1.115	SAI1_TXD0	CPU.SAI1_TXD0	AG20	NVCC_3V3	I/O	Internally used for BOOT mode configuration: can be pulled-up or down depending on MITO 8M Nano SOM P/N composition	ALT0	SAI1_TX_DATA0
							ALT1	SAI5_TX_DATA0
							ALT4	CORESIGHT_TRACE8
							ALT5	GPIO4_IO12
							ALT6	SRC_BOOT_CFG8
J1.117	SAI1_TXD1	CPU.SAI1_TXD1	AF20	NVCC_3V3	I/O	Internally used for BOOT mode configuration: can be pulled-up or down depending on MITO 8M Nano SOM P/N composition	ALT0	SAI1_TX_DATA1
							ALT1	SAI5_TX_DATA1
							ALT4	CORESIGHT_TRACE9
							ALT5	GPIO4_IO13
							ALT6	SRC_BOOT_CFG9
J1.119	SAI1_TXD2	CPU.SAI1_TXD2	AG21	NVCC_3V3	I/O	Internally used for BOOT mode configuration: can be pulled-up or down depending on MITO 8M Nano SOM P/N composition	ALT0	SAI1_TX_DATA2
							ALT1	SAI5_TX_DATA2
							ALT4	CORESIGHT_TRACE10
							ALT5	GPIO4_IO14
							ALT6	SRC_BOOT_CFG10
J1.121	SAI1_RXFS	CPU.SAI1_RXFS	AG16	NVCC_3V3	I/O		ALT0	SAI1_RX_SYNC (Configure register IOMUXC_SAI1_RX_SYNC_SELECT_INPUT for mode ALT0)
							ALT1	SAI5_RX_SYNC (Configure register IOMUXC_SAI5_RX_SYNC_SELECT_INPUT for mode ALT1)
							ALT4	CORESIGHT_TRACE_CLK
							ALT5	GPIO4_IO00
J1.123	SAI1_RXC	CPU.SAI1_RXC	AF16	NVCC_3V3	I/O		ALT0	SAI1_RX_BCLK
							ALT1	SAI5_RX_BCLK (Configure register IOMUXC_SAI5_RX_BCLK_SELECT_INPUT for mode ALT1)
							ALT4	CORESIGHT_TRACE_CTL
							ALT5	GPIO4_IO01
J1.125	SAI1_RXD0	CPU.SAI1_RXD0	AG15	NVCC_3V3	I/O	Internally used for BOOT mode configuration: can be pulled-up or down depending on MITO 8M Nano SOM P/N composition	ALT0	SAI1_RX_DATA0
							ALT1	SAI5_RX_DATA0 (Configure register IOMUXC_SAI5_RX_DATA_SELECT_INPUT_0 for mode ALT1)
							ALT2	SAI1_TX_DATA1
							ALT3	PDM_BIT_STREAM0 (Configure register IOMUXC_PDM_BIT_STREAM_SELECT_INPUT_0 for mode ALT3)
							ALT4	CORESIGHT_TRACE0
							ALT5	GPIO4_IO02
							ALT6	SRC_BOOT_CFG0
J1.127	SAI1_RXD1	CPU.SAI1_RXD1	AF15	NVCC_3V3	I/O	Internally used for BOOT mode configuration: can be pulled-up or down depending on MITO 8M Nano SOM P/N composition	ALT0	SAI1_RX_DATA1
							ALT1	SAI5_RX_DATA1 (Configure register IOMUXC_SAI5_RX_DATA_SELECT_INPUT_1 for mode ALT1)
							ALT3	PDM_BIT_STREAM1 (Configure register IOMUXC_PDM_BIT_STREAM_SELECT_INPUT_1 for mode ALT3)
							ALT4	CORESIGHT_TRACE1
							ALT5	GPIO4_IO03
							ALT6	SRC_BOOT_CFG1
J1.129	SAI1_RXD2	CPU.SAI1_RXD2	AG17	NVCC_3V3	I/O	Internally used for BOOT mode configuration: can be pulled-up or down depending on MITO 8M Nano SOM P/N composition	ALT0	SAI1_RX_DATA2
							ALT1	SAI5_RX_DATA2 (Configure register IOMUXC_SAI5_RX_DATA_SELECT_INPUT_2 for mode ALT1)
							ALT3	PDM_BIT_STREAM2 (Configure register IOMUXC_PDM_BIT_STREAM_SELECT_INPUT_2 for mode ALT3)
							ALT4	CORESIGHT_TRACE2
							ALT5	GPIO4_IO04
							ALT6	SRC_BOOT_CFG2
J1.131	DGND	DGND	-	-	G
J1.133	LVDS0_CLK_N	BRIDGE.A_CLKN	F9	-	D [Depending on MITO 8M Nano SOM P/N composition
J1.133	DSI_CLK_N	CPU.MIPI_DSI_CLK_N	A11	-	D	Depending on MITO 8M Nano SOM P/N composition
J1.135	LVDS0_CLK_P	BRIDGE.A_CLKP	F8	-	D	Depending on MITO 8M Nano SOM P/N composition
J1.135	DSI_CLK_P	CPU.MIPI_	B11	-	D	Depending on MITO 8M Nano SOM P/N composition
J1.137	LVDS0_TX0_N	BRIDGE.A_Y0N	C9	-	D	Depending on MITO 8M Nano SOM P/N composition
J1.137	DSI_D0_N	CPU.MIPI_DSI_D0_N	A9	-	D	Depending on MITO 8M Nano SOM P/N composition
J1.139	LVDS0_TX0_P	BRIDGE.A_Y0P	C8	-	D	Depending on MITO 8M Nano SOM P/N composition
J1.139	DSI_D0_P	CPU.MIPI_DSI_D0_P	B9	-	D	Depending on MITO 8M Nano SOM P/N composition
J1.141	LVDS0_TX1_N	BRIDGE.A_Y1N	D9	-	D	Depending on MITO 8M Nano SOM P/N composition
J1.141	DSI_D1_N	CPU.MIPI_DSI_D1_N	A10	-	D	Depending on MITO 8M Nano SOM P/N composition
J1.143	LVDS0_TX1_P	BRIDGE.A_Y1P	D8	-	D	Depending on MITO 8M Nano SOM P/N composition
J1.143	DSI_D1_P	CPU.MIPI_DSI_D1_P	B10	-	D	Depending on MITO 8M Nano SOM P/N composition
J1.145	LVDS0_TX2_N	BRIDGE.A_Y2N	E9	-	D	Depending on MITO 8M Nano SOM P/N composition
J1.145	DSI_D2_N	CPU.MIPI_DSI_D2_N	A12	-	D	Depending on MITO 8M Nano SOM P/N composition
J1.147	LVDS0_TX2_P	BRIDGE.A_Y2P	E8	-	D	Depending on MITO 8M Nano SOM P/N composition
J1.147	DSI_D2_P	CPU.MIPI_DSI_D2_P	B12	-	D	Depending on MITO 8M Nano SOM P/N composition
J1.149	LVDS0_TX3_N	BRIDGE.A_Y3N	G9	-	D	Depending on MITO 8M Nano SOM P/N composition
J1.149	DSI_D3_N	CPU.MIPI_DSI_D3_N	A13	-	D	Depending on MITO 8M Nano SOM P/N composition
J1.151	LVDS0_TX3_P	BRIDGE.A_Y3P	G8	-	D	Depending on MITO 8M Nano SOM P/N composition
J1.151	DSI_D3_P	CPU.MIPI_DSI_D3_P	B13	-	D	Depending on MITO 8M Nano SOM P/N composition
J1.153	DGND	DGND	-	-	G
J1.155	LVDS1_CLK_N	BRIDGE.B_CLKN	A6	-	D
J1.157	LVDS1_CLK_P	BRIDGE.B_CLKP	B6	-	D
J1.159	LVDS1_TX0_N	BRIDGE.B_Y0N	A3	-	D
J1.161	LVDS1_TX0_P	BRIDGE.B_Y0P	B3	-	D
J1.163	LVDS1_TX1_N	BRIDGE.B_Y1N	A4	-	D
J1.165	LVDS1_TX1_P	BRIDGE.B_Y1P	B4	-	D
J1.167	LVDS1_TX2_N	BRIDGE.B_Y2N	A5	-	D
J1.169	LVDS1_TX2_P	BRIDGE.B_Y2P	B5	-	D
J1.171	LVDS1_TX3_N	BRIDGE.B_Y3N	A7	-	D
J1.173	LVDS1_TX3_P	BRIDGE.B_Y3P	B7	-	D
J1.175	DGND	DGND	-	-	G
J1.177	SD2_CD_B	CPU.SD2_CD_B	AA26	NVCC_3V3	I/O		ALT0	USDHC2_CD_B
							ALT5	GPIO2_IO12
J1.179	ECSPI1_SS0	CPU.ECSPI1_SS0	B6	NVCC_3V3	I/O		ALT0	ECSPI1_SS0
							ALT1	UART3_RTS_B (Configure register IOMUXC_UART3_RTS_B_SELECT_INPUT for mode ALT1)
							ALT5	GPIO5_IO09
J1.181	ECSPI1_SCLK	CPU.ECSPI1_SCLK	D6	NVCC_3V3	I/O		ALT0	ECSPI1_SCLK
							ALT1	UART3_RX
							ALT5	GPIO5_IO06
J1.183	ECSPI1_MISO	CPU.ECSPI1_MISO	A7	NVCC_3V3	I/O		ALT0	ECSPI1_MISO
							ALT1	UART3_CTS_B
							ALT5	GPIO5_IO08
J1.185	GPIO1_IO03	CPU.GPIO1_IO03	AF13	NVCC_3V3	I/O		ALT0	GPIO1_IO03
							ALT1	USDHC1_VSELECT
							ALT5	SDMA1_EXT_EVENT0
J1.187	UART2_TXD	CPU.UART2_TXD	E15	NVCC_3V3	I/O	used as default Linux console	ALT0	UART2_TX
							ALT1	ECSPI3_SS0
							ALT5	GPIO5_IO25
J1.189	UART2_RXD	CPU.UART2_RXD	F15	NVCC_3V3	I/O	used as default Linux console	ALT0	UART2_RXD
							ALT1	ECSPI3_MISO
							ALT5	GPIO5_IO24
J1.191	UART4_TXD	CPU.UART4_TXD	F18	NVCC_3V3	I/O		ALT0	UART4_TX
							ALT1	UART2_RTS_B (Configure register IOMUXC_UART2_RTS_B_SELECT_INPUT for mode ALT1)
							ALT5	GPIO5_IO29
J1.193	UART4_RXD	CPU.UART4_RXD	F19	NVCC_3V3	I/O		ALT0	UART4_RX
							ALT1	UART2_CTS_B
							ALT5	GPIO5_IO28
J1.195	ECSPI1_MOSI	CPU.ECSPI1_MOSI	B7	NVCC_3V3	I/O		ALT0	ECSPI1_MOSI
							ALT1	UART3_TX
							ALT5	GPIO5_IO07
J1.197	GPIO1_IO14	CPU.GPIO1_IO14	AC9	NVCC_3V3	I/O		ALT0	GPIO1_IO14
							ALT1	USB2_OTG_PWR
							ALT4	USDHC3_CD_B (Configure register IOMUXC_USDHC3_CD_B_SELECT_INPUT for mode ALT4)
							ALT5	PWM3_OUT
							ALT6	CCM_CLKO1
J1.199	GPIO1_IO04	CPU.GPIO1_IO04	AG12	NVCC_3V3	I/O		ALT0	GPIO1_IO04
							ALT1	USDHC2_VSELECT
							ALT5	SDMA1_EXT_EVENT1
J1.201	GPIO1_IO12	CPU.GPIO1_IO12	AB10	NVCC_3V3	I/O		ALT0	GPIO1_IO12
							ALT1	USB1_OTG_PWR
							ALT5	SDMA2_EXT_EVENT1
J1.203	DGND	DGND	-	-	G

SODIMM J1 EVEN pins declaration

Pin	Pin Name	Internal Connections	Ball/pin #	Voltage domain	Type	Notes	Alternative Functions
J1.2	DGND	DGND	-	-	G
J1.4	3.3VIN	INPUT VOLTAGE	-	3.3VIN	S
J1.6	3.3VIN	INPUT VOLTAGE	-	3.3VIN	S
J1.8	3.3VIN	INPUT VOLTAGE	-	3.3VIN	S
J1.10	3.3VIN	INPUT VOLTAGE	-	3.3VIN	S
J1.12	DGND	DGND	-	-	G
J1.14	PMIC_LICELL	PMIC.LICELL	46	-	S
J1.16	CPU_ONOFF	CPU.ONOFF	A25	NVCC_SNVS_1V8	I	internal pull-up 100k to NVCC_SNVS_1V8
J1.18	BOARD_PGOOD	-	-	NVCC_3V3	O
J1.20	BOOT_MODE_SEL	BOOT MODE SELECTION	-	NVCC_3V3	I	internal pull-up to NVCC_3V3
J1.22	CPU_PORn	CPU.POR_B PMIC.RESET_MCU	B24 21	NVCC_SNVS_1V8	I/O	internal pull-up 100k to NVCC_SNVS_1V8
J1.24	PMIC_PWRON	PMIC.PWRON	22	-	I	internal pull-up 100k to VIN
J1.26	SAI3_RXC	CPU.SAI3_RXC	AG7	NVCC_3V3	I/O		ALT0	SAI3_RX_BCLK
							ALT1	GPT1_CLK
							ALT2	SAI5_RX_BCLK (Configure register IOMUXC_SAI5_RX_BCLK_SELECT_INPUT for mode ALT2)
							ALT4	UART2_CTS_B
							ALT5	GPIO4_IO29
J1.28	GPIO1_IO02	CPU.GPIO1_IO02	AG13	NVCC_3V3	I/O	Internally used for PMIC WDI, do not connect	ALT0	GPIO1_IO02
							ALT1	WDOG1_WDOG_B
							ALT5	WDOG1_WDOG_ANY
							ALT7	SJC_DE_B
J1.30	DGND	DGND	-	-	G
J1.32	SAI3_RXD	CPU.SAI3_RXD	AF7	NVCC_3V3	I/O		ALT0	SAI3_RX_DATA0
							ALT1	GPT1_COMPARE1
							ALT2	SAI5_RX_DATA0 (Configure register IOMUXC_SAI5_RX_DATA_SELECT_INPUT_0 for mode ALT2)
							ALT4	UART2_RTS_B (Configure register IOMUXC_UART2_RTS_B_SELECT_INPUT for mode ALT4)
							ALT5	GPIO4_IO30
J1.34	SAI2_MCLK	CPU.SAI2_MCLK	AD19	NVCC_3V3	I/O		ALT0	SAI2_MCLK
							ALT1	SAI5_MCLK (Configure register IOMUXC_SAI5_MCLK_SELECT_INPUT for mode ALT1)
							ALT5	GPIO4_IO27
J1.36	SAI3_RXFS	CPU.SAI3_RXFS	AG8	NVCC_3V3	I/O		ALT0	SAI3_RX_SYNC
							ALT1	GPT1_CAPTURE1
							ALT2	SAI5_RX_SYNC (Configure register IOMUXC_SAI5_RX_SYNC_SELECT_INPUT for mode ALT2)
							ALT3	SAI3_RX_DATA1
							ALT5	GPIO4_IO28
J1.38	I2C3_SCL	CPU.I2C3_SCL	E10	NVCC_3V3	I/O		ALT0	I2C3_SCL
							ALT1	PWM4_OUT
							ALT2	GPT2_CLK
							ALT5	GPIO5_IO18
J1.40	SAI3_TXFS	CPU.SAI3_TXFS	AC6	NVCC_3V3	I/O		ALT0	SAI3_TX_SYNC
							ALT1	GPT1_CAPTURE2
							ALT2	SAI5_RX_DATA1 (Configure register IOMUXC_SAI5_RX_DATA_SELECT_INPUT_1 for mode ALT2)
							ALT3	SAI3_TX_DATA1
							ALT4	UART2_RX
							ALT5	GPIO4_IO31
J1.42	SPDIF_RX	CPU.SPDIF_RX	AG9	NVCC_3V3	I/O		ALT0	SPDIF1_IN
							ALT1	PWM2_OUT
							ALT5	GPIO5_IO04
J1.44	SPDIF_TX	CPU.SPDIF_TX	AF9	NVCC_3V3	I/O		ALT0	SPDIF1_OUT
							ALT1	PWM3_OUT
							ALT5	GPIO5_IO03
J1.46	SAI3_MCLK	CPU.SAI3_MCLK	AD6	NVCC_3V3	I/O		ALT0	SAI3_MCLK
							ALT1	PWM4_OUT
							ALT2	SAI5_MCLK (Configure register IOMUXC_SAI5_MCLK_SELECT_INPUT for mode ALT2)
							ALT5	GPIO5_IO02
J1.48	I2C3_SDA	CPU.I2C3_SDA	F10	NVCC_3V3	I/O		ALT0	I2C3_SDA
							ALT1	PWM3_OUT
							ALT2	GPT3_CLK
							ALT5	GPIO5_IO19
J1.50	SAI3_TXC	CPU.SAI3_TXC	AG6	NVCC_3V3	I/O		ALT0	SAI3_TX_BCLK
							ALT1	GPT1_COMPARE2
							ALT2	SAI5_RX_DATA2 (Configure register IOMUXC_SAI5_RX_DATA_SELECT_INPUT_2 for mode ALT2)
							ALT4	UART2_TX
							ALT5	GPIO5_IO00
J1.52	SAI3_TXD	CPU.SAI3_TXD	AF6	NVCC_3V3	I/O		ALT0	SAI3_TX_DATA0
							ALT1	GPT1_COMPARE3
							ALT2	SAI5_RX_DATA3 (Configure register IOMUXC_SAI5_RX_DATA_SELECT_INPUT_3 for mode ALT2)
							ALT5	GPIO5_IO01
J1.54	SAI1_MCLK	CPU.SAI1_MCLK	AB18	NVCC_3V3	I/O		ALT0	SAI1_MCLK
							ALT1	SAI5_MCLK (Configure register IOMUXC_SAI5_MCLK_SELECT_INPUT for mode ALT1)
							ALT2	SAI1_TX_BCLK (Configure register IOMUXC_SAI1_TX_BCLK_SELECT_INPUT for mode ALT2)
							ALT3	PDM_CLK
							ALT5	GPIO4_IO20
J1.56	DGND	DGND	-	-	G
J1.58	SAI5_MCLK	CPU.SAI5_MCLK	AD15	NVCC_3V3	I/O		ALT0	SAI5_MCLK (Configure register IOMUXC_SAI5_MCLK_SELECT_INPUT for mode ALT0)
							ALT1	SAI1_TX_BCLK (Configure register IOMUXC_SAI1_TX_BCLK_SELECT_INPUT for mode ALT1)
							ALT5	GPIO3_IO25
J1.60	GPIO1_IO10	CPU.GPIO1_IO10	AD10	NVCC_3V3	I/O	Internally used for ETH PHY interrupt, do not connect	ALT0	GPIO1_IO10
							ALT1	USB1_OTG_ID
J1.62	SAI5_RXFS	CPU.SAI5_RXFS	AB15	NVCC_3V3	I/O		ALT0	SAI5_RX_SYNC (Configure register IOMUXC_SAI5_RX_SYNC_SELECT_INPUT for mode ALT0)
							ALT1	SAI1_TX_DATA0
							ALT5	GPIO3_IO19
J1.64	SAI5_RXC	CPU.SAI5_RXC	AC15	NVCC_3V3	I/O		ALT0	SAI5_RX_BCLK (Configure register IOMUXC_SAI5_RX_BCLK_SELECT_INPUT for mode ALT0)
							ALT1	SAI1_TX_DATA1
							ALT4	PDM_CLK
							ALT5	GPIO3_IO20
J1.66	SAI2_TXC	CPU.SAI2_TXC	AD22	NVCC_3V3	I/O		ALT0	SAI2_TX_BCLK
							ALT1	SAI5_TX_DATA2
							ALT5	GPIO4_IO25
J1.68	SAI2_TXD0	CPU.SAI2_TXD0	AC22	NVCC_3V3	I/O		ALT0	SAI2_TX_DATA0
							ALT1	SAI5_TX_DATA3
							ALT5	GPIO4_IO26
J1.70	SAI2_TXFS	CPU.SAI2_TXFS	AD23	NVCC_3V3	I/O		ALT0	SAI2_TX_SYNC
							ALT1	SAI5_TX_DATA1
							ALT3	SAI2_TX_DATA1
							ALT4	UART1_CTS_B
							ALT5	GPIO4_IO24
J1.72	SAI2_RXD0	CPU.SAI2_RXD0	AC24	NVCC_3V3	I/O		ALT0	SAI2_RX_DATA0
							ALT1	SAI5_TX_DATA0
							ALT4	UART1_RTS_B (Configure register IOMUXC_UART1_RTS_B_SELECT_INPUT for mode ALT4)
							ALT5	GPIO4_IO23
J1.74	I2C4_SDA	CPU.I2C4_SDA	E13	NVCC_3V3	I/O		ALT0	I2C4_SDA
							ALT1	PWM1_OUT
							ALT5	GPIO5_IO21
J1.76	I2C4_SCL	CPU.I2C4_SCL	D13	NVCC_3V3	I/O		ALT0	I2C4_SCL
							ALT1	PWM2_OUT
							ALT5	GPIO5_IO20
J1.78	SAI5_RXD2	CPU.SAI5_RXD2	AD13	NVCC_3V3	I/O		ALT0	SAI5_RX_DATA2 (Configure register IOMUXC_SAI5_RX_DATA_SELECT_INPUT_2 for mode ALT0)
							ALT1	SAI1_TX_DATA4
							ALT2	SAI1_TX_SYNC (Configure register IOMUXC_SAI1_TX_SYNC_SELECT_INPUT for mode ALT2)
							ALT3	SAI5_TX_BCLK (Configure register IOMUXC_SAI5_TX_BCLK_SELECT_INPUT for mode ALT3)
							ALT4	PDM_BIT_STREAM2 (Configure register IOMUXC_PDM_BIT_STREAM_SELECT_INPUT_2 for mode ALT4)
							ALT5	GPIO3_IO23
J1.80	SAI5_RXD3	CPU.SAI5_RXD3	AC13	NVCC_3V3	I/O		ALT0	SAI5_RX_DATA3 (Configure register IOMUXC_SAI5_RX_DATA_SELECT_INPUT_3 for mode ALT0)
							ALT1	SAI1_TX_DATA5
							ALT2	SAI1_TX_SYNC (Configure register IOMUXC_SAI1_TX_SYNC_SELECT_INPUT for mode ALT2)
							ALT3	SAI5_TX_DATA0
							ALT4	PDM_BIT_STREAM3 (Configure register IOMUXC_PDM_BIT_STREAM_SELECT_INPUT_3 for mode ALT4)
							ALT5	GPIO3_IO24
J1.82	DGND	DGND	-	-	G
J1.84
J1.86
J1.88	CLKIN1	CPU.CLKIN1	H27	NVCC_3V3	I
J1.90	CLKIN2	CPU.CLKIN2	J27	NVCC_3V3	I
J1.92
J1.94
J1.96
J1.98
J1.100	DGND	DGND	-	-	G
J1.102	CSI_P1_CKN	CPU.MIPI_CSI_CLK_N	A16	-	D
J1.104	CSI_P1_CKP	CPU.MIPI_CSI_CLK_P	B16	-	D
J1.106	CSI_P1_DN0	CPU.MIPI_CSI_D0_N	A14	-	D
J1.108	CSI_P1_DP0	CPU.MIPI_CSI_D0_P	B14	-	D
J1.110	CSI_P1_DN1	CPU.MIPI_CSI_D1_N	A15	-	D
J1.112	CSI_P1_DP1	CPU.MIPI_CSI_D1_P	B15	-	D
J1.114	CSI_P1_DN2	CPU.MIPI_CSI_D2_N	A17	-	D
J1.116	CSI_P1_DP2	CPU.MIPI_CSI_D2_P	B17	-	D
J1.118	CSI_P1_DN3	CPU.MIPI_CSI_D3_N	A18	-	D
J1.120	CSI_P1_DP3	CPU.MIPI_CSI_D3_P	B18	-	D
J1.122	DGND	DGND	-	-	G
J1.124 (NAND on board)	NAND_DQS	CPU.NAND_DQS	R22	NVCC_3V3	I/O	Internally used for NAND, do not connect
J1.124 (eMMC on board)	NAND_DQS	CPU.NAND_DQS	R22	NVCC_3V3	I/O		ALT0	RAWNAND_DQS
							ALT1	QSPI_A_DQS
							ALT5	GPIO3_IO14
J1.126 (NAND on board)	NAND_ALE	CPU.NAND_ALE	N22	NVCC_3V3	I/O	Internally used for NAND, do not connect
J1.126 (eMMC on board)	NAND_ALE	CPU.NAND_ALE	N22	NVCC_3V3	I/O		ALT0	RAWNAND_ALE
							ALT1	QSPI_A_SCLK
							ALT5	GPIO3_IO00
J1.128 (NAND on board)	SD1_CLK	CPU.SD1_CLK	V26	NVCC_3V3 (NVCC_1V8 on request)	I/O		ALT0	USDHC1_CLK
							ALT5	GPIO2_IO00
J1.128 (eMMC on board)	NAND_CE0_B	CPU.NAND_CE0_B	N24	NVCC_3V3	I/O		ALT0	RAWNAND_CE0_B
							ALT1	QSPI_A_SS0_B
							ALT5	GPIO3_IO01
J1.130 (NAND on board)	SD1_CMD	CPU.SD1_CMD	V27	NVCC_3V3 (NVCC_1V8 on request)	I/O		ALT0	USDHC1_CMD
							ALT5	GPIO2_IO01
J1.130 (eMMC on board)	NAND_CE1_B	CPU.NAND_CE1_B	P27	NVCC_3V3	I/O		ALT0	RAWNAND_CE1_B
							ALT1	QSPI_A_SS1_B
							ALT2	USDHC3_STROBE
							ALT5	GPIO3_IO02
J1.132 (NAND on board)	SD1_RST_B	CPU.SD1_RST_B	R23	NVCC_3V3 (NVCC_1V8 on request)	I/O		ALT0	USDHC1_RESET_B
							ALT5	GPIO2_IO10
J1.132 (eMMC on board)	NAND_CE2_B	CPU.NAND_CE2_B	M27	NVCC_3V3	I/O		ALT0	RAWNAND_CE2_B
							ALT1	QSPI_B_SS0_B
							ALT2	USDHC3_DATA5
							ALT5	GPIO3_IO03
J1.134 (NAND on board)	SD1_STROBE	CPU.SD1_STROBE	R24	NVCC_3V3 (NVCC_1V8 on request)	I/O		ALT0	USDHC1_STROBE
							ALT5	GPIO2_IO11
J1.134 (eMMC on board)	NAND_CE3_B	CPU.NAND_CE3_B	L27	NVCC_3V3	I/O		ALT0	RAWNAND_CE3_B
							ALT1	QSPI_B_SS1_B
							ALT2	USDHC3_DATA6
							ALT5	GPIO3_IO034
J1.136 (NAND on board)	NAND_CLE	CPU.NAND_CLE	K27	NVCC_3V3	I/O	Internally used for NAND, do not connect
J1.136 (eMMC on board)	NAND_CLE	CPU.NAND_CLE	K27	NVCC_3V3	I/O		ALT0	RAWNAND_CLE
							ALT1	QSPI_B_SCLK
							ALT2	USDHC3_DATA7
							ALT5	GPIO3_IO05
J1.138 (NAND on board)	SD1_DATA0	CPU.SD1_DATA0	Y27	NVCC_3V3 (NVCC_1V8 on request)	I/O		ALT0	USDHC1_DATA0
							ALT5	GPIO2_IO02
J1.138 (eMMC on board)	NAND_DATA00	CPU.NAND_DATA00	P23	NVCC_3V3	I/O		ALT0	RAWNAND_DATA00
							ALT1	QSPI_A_DATA0
							ALT5	GPIO3_IO06
J1.140 (NAND on board)	SD1_DATA1	CPU.SD1_DATA1	Y26	NVCC_3V3 (NVCC_1V8 on request)	I/O		ALT0	USDHC1_DATA1
							ALT5	GPIO2_IO0
J1.140 (eMMC on board)	NAND_DATA01	CPU.NAND_DATA01	K24	NVCC_3V3	I/O		ALT0	RAWNAND_DATA01
							ALT1	QSPI_A_DATA1
							ALT5	GPIO3_IO07
J1.142 (NAND on board)	SD1_DATA2	CPU.SD1_DATA2	T27	NVCC_3V3 (NVCC_1V8 on request)	I/O		ALT0	USDHC1_DATA2
							ALT5	GPIO2_IO04
J1.142 (eMMC on board)	NAND_DATA02	CPU.NAND_DATA02	K23	NVCC_3V3	I/O		ALT0	RAWNAND_DATA02
							ALT1	QSPI_A_DATA2
							ALT2	USDHC3_CD_B (Configure register IOMUXC_USDHC3_CD_B_SELECT_INPUT for mode ALT2)
							ALT5	GPIO3_IO08
J1.144 (NAND on board)	SD1_DATA3	CPU.SD1_DATA3	T26	NVCC_3V3 (NVCC_1V8 on request)	I/O		ALT0	USDHC1_DATA3
							ALT5	GPIO2_IO05
J1.144 (eMMC on board)	NAND_DATA03	CPU.NAND_DATA03	N23	NVCC_3V3	I/O		ALT0	RAWNAND_DATA03
							ALT1	QSPI_A_DATA3
							ALT2	USDHC3_WP (Configure register IOMUXC_USDHC3_WP_SELECT_INPUT for mode ALT2)
							ALT5	GPIO3_IO09
J1.146	DGND	DGND	-	-	G
J1.148 (NAND on board)	SD1_DATA4	CPU.SD1_DATA4	U27	NVCC_3V3 (NVCC_1V8 on request)	I/O		ALT0	USDHC1_DATA4
							ALT5	GPIO2_IO06
J1.148 (eMMC on board)	NAND_DATA04	CPU.NAND_DATA04	M26	NVCC_3V3	I/O		ALT0	RAWNAND_DATA04
							ALT1	QSPI_B_DATA0
							ALT2	USDHC3_DATA0
							ALT5	GPIO3_IO10
J1.150 (NAND on board)	SD1_DATA5	CPU.SD1_DATA5	U26	NVCC_3V3 (NVCC_1V8 on request)	I/O		ALT0	USDHC1_DATA5
							ALT5	GPIO2_IO07
J1.150 (eMMC on board)	NAND_DATA05	CPU.NAND_DATA05	L26	NVCC_3V3	I/O		ALT0	RAWNAND_DATA05
							ALT1	QSPI_B_DATA1
							ALT2	USDHC3_DATA1
							ALT5	GPIO3_IO11
J1.152 (NAND on board)	SD1_DATA6	CPU.SD1_DATA6	W27	NVCC_3V3 (NVCC_1V8 on request)	I/O		ALT0	USDHC1_DATA6
							ALT5	GPIO2_IO08
J1.152 (eMMC on board)	NAND_DATA06	CPU.NAND_DATA06	K26	NVCC_3V3	I/O		ALT0	RAWNAND_DATA06
							ALT1	QSPI_B_DATA2
							ALT2	USDHC3_DATA2
							ALT5	GPIO3_IO12
J1.154 (NAND on board)	SD1_DATA7	CPU.SD1_DATA7	W26	NVCC_3V3 (NVCC_1V8 on request)	I/O		ALT0	USDHC1_DATA7
							ALT5	GPIO2_IO09
J1.154 (eMMC on board)	NAND_DATA07	CPU.NAND_DATA07	N26	NVCC_3V3	I/O		ALT0	RAWNAND_DATA07
							ALT1	QSPI_B_DATA3
							ALT2	USDHC3_DATA3
							ALT5	GPIO3_IO13
J1.156 (NAND on board)	NAND_RE_B	CPU.NAND_RE_B	N27	NVCC_3V3	I/O	Internally used for NAND, do not connect
J1.156 (eMMC on board)	NAND_RE_B	CPU.NAND_RE_B	N27	NVCC_3V3	I/O		ALT0	RAWNAND_RE_B
							ALT1	QSPI_B_DQS
							ALT2	USDHC3_DATA4
							ALT5	GPIO3_IO15
J1.158 (NAND on board)	NAND_READY_B	CPU.NAND_READY_B	P26	NVCC_3V3	I/O	Internally used for NAND, do not connect
J1.158 (eMMC on board)	NAND_READY_B	CPU.NAND_READY_B	P26	NVCC_3V3	I/O		ALT0	RAWNAND_READY_B
							ALT2	USDHC3_RESET_B
							ALT5	GPIO3_IO16
J1.160 (NAND on board)	NAND_WE_B	CPU.NAND_WE_B	R26	NVCC_3V3	I/O	Internally used for NAND, do not connect
J1.160 (eMMC on board)	NAND_WE_B	CPU.NAND_WE_B	R26	NVCC_3V3	I/O		ALT0	RAWNAND_WE_B
							ALT2	USDHC3_CLK
							ALT5	GPIO3_IO17
J1.162 (NAND on board)	NAND_WP_B	CPU.NAND_WP_B	R27	NVCC_3V3	I/O	Internally used for NAND, do not connect
J1.162 (eMMC on board)	NAND_WP_B	CPU.NAND_WP_B	R27	NVCC_3V3	I/O		ALT0	RAWNAND_WP_B
							ALT2	USDHC3_CMD
							ALT5	GPIO3_IO18
J1.164	DGND	DGND	-	-	G
J1.166	GPIO1_IO15	CPU.GPIO1_IO15	AB9	NVCC_3V3	I/O		ALT0	GPIO1_IO15
							ALT1	USB2_OTG_OC
							ALT4	USDHC3_WP (Configure register IOMUXC_USDHC3_WP_SELECT_INPUT for mode ALT4)
							ALT5	PWM4_OUT
							ALT6	CCM_CLKO2
J1.168	GPIO1_IO07	CPU.GPIO1_IO07	AF11	NVCC_3V3	I/O		ALT0	GPIO1_IO07
							ALT1	ENET1_MDIO (Configure register IOMUXC_ENET1_MDIO_SELECT_INPUT for mode ALT1)
							ALT5	USDHC1_WP
							ALT6	CCM_EXT_CLK4
J1.170	SAI1_TXD4	CPU.SAI1_TXD4	AG22	NVCC_3V3	I/O	Internally used for BOOT mode configuration: can be pulled-up or down depending on MITO 8M Nano SOM P/N composition	ALT0	SAI1_TX_DATA4
							ALT1	SAI6_RX_BCLK (Configure register IOMUXC_SAI6_RX_BCLK_SELECT_INPUT for mode ALT1)
							ALT2	SAI6_TX_BCLK (Configure register IOMUXC_SAI6_TX_BCLK_SELECT_INPUT for mode ALT2)
							ALT4	CORESIGHT_TRACE12
							ALT5	GPIO4_IO16
							ALT6	SRC_BOOT_CFG12
J1.172	SAI1_TXD5	CPU.SAI1_TXD5	AF22	NVCC_3V3	I/O	Internally used for BOOT mode configuration: can be pulled-up or down depending on MITO 8M Nano SOM P/N composition	ALT0	SAI1_TX_DATA5
							ALT1	SAI6_RX_DATA0 (Configure register IOMUXC_SAI6_RX_DATA_SELECT_INPUT_0 for mode ALT1)
							ALT2	SAI6_TX_DATA0
							ALT4	CORESIGHT_TRACE13
							ALT5	GPIO4_IO17
							ALT6	SRC_BOOT_CFG13
J1.174	SAI1_TXD6	CPU.SAI1_TXD6	AG23	NVCC_3V3	I/O	Internally used for BOOT mode configuration: can be pulled-up or down depending on MITO 8M Nano SOM P/N composition	ALT0	SAI1_TX_DATA6
							ALT1	SAI6_RX_SYNC (Configure register IOMUXC_SAI6_RX_SYNC_SELECT_INPUT for mode ALT1)
							ALT2	SAI6_TX_SYNC (Configure register IOMUXC_SAI6_TX_SYNC_SELECT_INPUT for mode ALT2)
							ALT4	CORESIGHT_TRACE14
							ALT5	GPIO4_IO18
							ALT6	SRC_BOOT_CFG14
J1.176	SAI1_TXD7	CPU.SAI1_TXD7	AF23	NVCC_3V3	I/O	Internally used for BOOT mode configuration: can be pulled-up or down depending on MITO 8M Nano SOM P/N composition	ALT0	SAI1_TX_DATA7
							ALT1	SAI6_MCLK (Configure register IOMUXC_SAI6_MCLK_SELECT_INPUT for mode ALT1)
							ALT3	PDM_CLK
							ALT4	CORESIGHT_TRACE15
							ALT5	GPIO4_IO19
							ALT6	SRC_BOOT_CFG15
J1.178	SAI1_RXD7	CPU.SAI1_RXD7	AF19	NVCC_3V3	I/O	Internally used for BOOT mode configuration: can be pulled-up or down depending on MITO 8M Nano SOM P/N composition	ALT0	SAI1_RX_DATA7
							ALT1	SAI6_MCLK (Configure register IOMUXC_SAI6_MCLK_SELECT_INPUT for mode ALT1)
							ALT2	SAI1_TX_SYNC (Configure register IOMUXC_SAI1_TX_SYNC_SELECT_INPUT for mode ALT2)
							ALT3	SAI1_TX_DATA4
							ALT4	CORESIGHT_TRACE7
							ALT5	GPIO4_IO09
							ALT6	SRC_BOOT_CFG7
J1.180	SAI1_RXD6	CPU.SAI1_RXD6	AG19	NVCC_3V3	I/O	Internally used for BOOT mode configuration: can be pulled-up or down depending on MITO 8M Nano SOM P/N composition	ALT0	SAI1_RX_DATA6
							ALT1	SAI6_TX_SYNC (Configure register IOMUXC_SAI6_TX_SYNC_SELECT_INPUT for mode ALT1)
							ALT2	SAI6_RX_SYNC (Configure register IOMUXC_SAI6_RX_SYNC_SELECT_INPUT for mode ALT2)
							ALT4	CORESIGHT_TRACE6
							ALT5	GPIO4_IO08
							ALT6	SRC_BOOT_CFG6
J1.182	SAI1_RXD5	CPU.SAI1_RXD5	AF18	NVCC_3V3	I/O	Internally used for BOOT mode configuration: can be pulled-up or down depending on MITO 8M Nano SOM P/N composition	ALT0	SAI1_RX_DATA5
							ALT1	SAI6_TX_DATA0
							ALT2	SAI6_RX_DATA0 (Configure register IOMUXC_SAI6_RX_DATA_SELECT_INPUT_0 for mode ALT2)
							ALT3	SAI1_RX_SYNC (Configure register IOMUXC_SAI1_RX_SYNC_SELECT_INPUT for mode ALT3)
							ALT4	CORESIGHT_TRACE5
							ALT5	GPIO4_IO07
							ALT6	SRC_BOOT_CFG
J1.184	SAI1_RXD4	CPU.SAI1_RXD4	AG18	NVCC_3V3	I/O	Internally used for BOOT mode configuration: can be pulled-up or down depending on MITO 8M Nano SOM P/N composition	ALT0	SAI1_RX_DATA4
							ALT1	SAI1_RX_DATA4 (Configure register IOMUXC_SAI6_TX_BCLK_SELECT_INPUT for mode ALT1)
							ALT2	SAI6_RX_BCLK (Configure register IOMUXC_SAI6_RX_BCLK_SELECT_INPUT for mode ALT2)
							ALT4	CORESIGHT_TRACE4
							ALT5	GPIO4_IO06
							ALT6	SRC_BOOT_CFG4
J1.186	USB1_VBUS	CPU.USB1_VBUS	F22		S	Connected with 30K resistor on SOM. See IMX8MM datasheet for 5V tolerance info.
J1.188	USB2_VBUS	CPU.USB2_VBUS	F23		S	Connected with 30K resistor on SOM. See IMX8MM datasheet for 5V tolerance info.
J1.190	DGND	DGND	-	-	G
J1.192	USB1_ID	CPU.USB1_ID	D22	VDDA_1V8	I
J1.194	USB2_ID	CPU.USB2_ID	D23	VDDA_1V8	I
J1.196	USB1_DN	CPU.USB1_DN	A22	-	D
J1.198	USB1_DP	CPU.USB1_DP	B22	-	D
J1.200	USB2_DP	CPU.USB2_DP	B23	-	D
J1.202	USB2_DN	CPU.USB2_DN	A23	-	D
J1.204	DGND	DGND	-	-	G

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Power and reset

Power Supply Unit (PSU) and recommended power-up sequence

Implementing correct power-up sequence for iMX8M Mini/Nano processors is not a trivial task because several power rails are involved.

MITO 8M Mini SOM simplifies this task by embedding all the needed circuitry. The following picture shows a simplified block diagram of PSU/voltage monitoring circuitry:

The PSU is composed of two main blocks:

• power management integrated circuit
• additional generic power management circuitry that completes PMIC functionalities

The PSU:

• generates the proper power-up sequence required by the SOC processor and surrounding memories and peripherals
• synchronizes the powering up of carrier board in order to prevent back power

Power-up sequence

The typical power-up sequence is the following:

1. 3.3VIN main power supply rail is powered
2. SNVS domain signals are pulled-up (unless carrier board circuitry keeps this signal low for any reason)
3. CPU_PORn (active-low) is driven low by PMIC
4. RTC_RESET_B are internally released after 10ms
5. PMIC initiates power-up sequence needed by iMX8M Mini/Nano processor
6. BOARD_PGOOD goes up when all CPU I/O power rail is ready
7. CPU_PORn is deasserted after the last regulator to bring the processor out of reset

Note on BOARD_PGOOD usage

BOARD_PGOOD is generally used on carrier board to drive loads such as DC/DC enable inputs or switch on/off control signals.

Depending on the kind of such loads, BOARD_PGOOD might not be able to drive them properly because it has a 20mA output current absolute maximum rating.

In these cases a simple 2-input AND port can be used to address this issue. The following picture depicts a principle schematic showing this solution.

Additionally, we suggest using an IC with Schmitt trigger input ports.

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Reset scheme and control signals

The following picture shows the simplified block diagram of reset scheme and voltage monitoring.

NVCC_VSNVS_1V8

Some signals that are related to reset circuitry are pulled-up to NVCC_VSNVS_1V8.

Hence it is recommended that system designer takes into account these factors in order to properly manage these signals at carrier board level.

CPU_PORn

PMIC can assert this active-low signal and it is internally pulled-up with a 100kΩ to NVCC_VSNVS_1V8.

Other internal IC, such as ethernet PHY or boot memory devices, could be connected to this signal. This guarantees it is in a known state when reset signal is released.

PMIC_PWRON

PMIC_PWRON is internally pulled-up with a 100kΩ to VIN and has a capacitor of 10nF to GND. This input signal is connected directly to the PWRON input of the PMIC.

CPU_ONOFF

CPU_ONOFF is internally pulled-up with a 100kΩ to NVCC_VSNVS_1V8. This input signal is connected directly to the ONOFF input of the CPU.

BOARD_PGOOD

BOARD_PGOOD is directly related to the internal NVCC_3V3 rail (I/O pins supply) presence and must be used as power enable for all the electronics on MITO 8M carrier board.

When the I/O pins power rail on MITO 8M Mini/Nano is not ready (BOARD_PGOOD low) all the integrated circuits connected to the CPU must be powered off in order to avoid back-powering or other issue related to a wrong power-up sequence.

BOOT_MODE_SEL

BOOT_MODE_SEL is internally pulled-up with a 100kΩ to NVCC_3V3.

When connected to GND, select the external microSD as the boot device.

Handling CPU-initiated software reset

By default, MX8 processor does not assert any external signal when it initiates a software reset sequence. Also default software reset implementation does not guarantee that all processor registers are reset properly.

For these reasons it is strongly recommended to use a different approach that, in combination with the use of a processor's watchdog timer (WDT), provides a full hardware reset in case a software reset is issued.

This technique is implemented in DESK-MX8M-L. At the software level, U-Boot and Linux kernel software reset routines make use of the processor's WDT to assert the WDOG_B signal. This signal in turn is routed to the GPIO1_IO02 pad. At the hardware level, this signal is AC-coupled to the master reset pin of the internal supervisor IC. It acts as a complete hardware reset by the assertion of its RESETn output (on the same way of EXT_RESET pin).

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System boot

The boot process begins at Power On Reset (POR) where the hardware reset logic forces the ARM core to begin execution starting from the on-chip boot ROM. The boot ROM:

• determines whether the boot is secure or non-secure
• performs some initialization of the system and clean-ups
• reads the mode pins to determine the primary boot device
• once it is satisfied, it executes the boot code

Boot options

Two options are available related to system boot. They are identified by the Boot field of the ordering code as follows:

• 0: eMMC / SD option (SOM code: DMMxxx0xxxxR)
• 1: NAND / SD option (SOM code: DMMxxx1xxxxR)

For both options the selection of primary boot device is determined by the BOOT_MODE_SEL signal as described in the following sections. BOOT_MODE_SEL is latched when processor reset is released.

In any case, boot process is managed by on-chip boot ROM code that is described in detail in processor's Reference Manual.

eMMC / SD option

Selection of primary boot device is determined by the BOOT_MODE_SEL signal as follows:

• BOOT_MODE_SEL = 0
  • primary boot device is SD2 (USDHC2)
• boot ROM will try to boot a valid image from the SD card. In case no valid image is found, boot ROM shall enable USB serial download mode automatically
• BOOT_MODE_SEL = 1 or floating
  • primary boot device is eMMC connected to USDHC1
  • in case no valid image is found on eMMC, boot ROM shall enable USB serial download mode automatically

NAND / SD option

Selection of primary boot device is determined by the BOOT_MODE_SEL signal as follows:

• BOOT_MODE_SEL = 0
  • primary boot device is SD2 (USDHC2)
  • in case no valid image is found in SD card, boot ROM shall enable USB serial download mode automatically
• BOOT_MODE_SEL = 1 or floating
  • primary boot device is NAND flash
  • in case no valid image is found in NAND flash, boot ROM shall enable USB serial download mode automatically

Important note for manufacture mode management

When the internal boot and recover boot (if enabled) failed, the boot goes to the SD/MMC manufacture mode before the serial download mode.

By default, the SD/MMC manufacture mode is enabled. DAVE Embedded Systems do not blow the fuse of the DISABLE_SDMMC_MFG in order to disable it.

Boot ROM detect SD/MMC card on USDHC2 port. If a card is inserted, ROM will try to boot from it. SD2_CD_B is used as card detect signal during bootrom's manufacture mode. This signal need to be kept high during bootstrap stage in order to prevent the intervention of bootrom's manufacture mode, if it's not desidered.

Bootstrap stage has to be intended as the time elapsing between the release of hardware reset (CPU_PORn) and the execution of the first instruction of user code (typically this is the reset vector of U-Boot boot loader).

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On board JTAG connector

JTAG signals are routed to a dedicated connector on the MITO 8M Mini/Nano PCB.

The connector is placed on the top side of the PCB, on the right side (please see the picture below).

J7 - Connector's pinout

J7 footprint mates with Samtec FSI-110-03-G-S connector. The following table reports the connector's pinout:

Pin#	Pin name	Function	Notes
1	DGND	-
2	EEPROM_WP	-
3	NC	-
4	JTAG_TCK	-	internal pull-down 10k to DGND
5	JTAG_TMS	-
6	JTAG_TDO	-
7	JTAG_TDI	-
8	JTAG_nTRST	-
9	CPU_PORn	-	internal pull-up 100k to NVCC_SNVS_1V8
10	NVCC_3V3	-	reference voltage for JTAG signals 3.3V

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Peripherals

Peripheral Audio

The Audio interface available on MITO 8M Mini/Nano is based on iMX8M Mini/Nano SoC which provides the following audio subsystems:

• Synchronous Audio Interface (SAI)
  • 5x I2S/SAI (20+ channels, each 32-bits @384 kHz)
  • Highest levels of pro audio fidelity with more than 20 audio channels each @384KHz
• Sony/Philips Digital Interface (SPDIF)
  • S/PDIF Tx/Rx

Description

The I2S (or I2S) module provides a synchronous audio interface (SAI) that supports full- duplex serial interfaces with frame synchronization such as I2S, AC97, TDM, and codec/DSP interfaces. It supports the following standards and features:

• Transmitter and receiver with independent bit clock and frame sync supporting 8 data lines
• Each data line can support a maximum Frame size of 32 words
• Asynchronous 128 x 32-bit FIFO for each transmit and receive data line
• Supports packing of 8-bit and 16-bit data into each 32-bit FIFO word
• Supports combining multiple data line FIFOs into single data line FIFO

The Sony/Philips Digital Interface (SPDIF) audio block is a stereo transceiver that allows the processor to receive and transmit digital audio.

Pin mapping

The Pin mapping is described in the Pinout table section

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Peripheral Ethernet

Description

The 10/100/1000-Mbit/s Ethernet interface available on MITO 8M Mini/Nano is based on iMX8M Mini/Nano SoC.

The SOC is directly interfaced with an ETH PHY chip (MICROCHIP KSZ9031RNX) that has the following features:

• Auto-Negotiation to Automatically Select the Highest Link-Up Speed (10/100/1000 Mbps) and Duplex (Half/Full)
• On-Chip Termination Resistors for the Differential Pairs
• Energy Detect Power-Down Mode for Reduced Power Consumption When the Cable is Not Attached

Important note for the external magnetic connection

The Ethernet peripheral requires an external insulator magnetic on the carrier board.

The four transformer center tap pins on the PHY side should not be connected to any power supply source on the board; rather, the center tap pins should be separated from one another and connected through separate 0.1 µF common-mode capacitors to ground. Separation is required because the common-mode voltage could be different between the four differential pairs, depending on the connected speed mode.

See KSZ9031RNX datasheet for more details.

Pin mapping

The Pin mapping is described in the Pinout table section

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Peripheral LVDS

The LVDS interface available on MITO 8M Mini/Nano is based on a MIPI® DSI To FLATLINK™ LVDS bridge IC.

It is directly connected to the MIPI® DSI output port of iMX8M Mini/Nano SOC.

This support covers all aspects of these activities:

• Connectivity to relevant devices - Displays with LVDS receivers
• Arranging the data as required by the external display receiver and by LVDS display standards
• Synchronization and control capabilities

This interface is available when the MIPI-to-LVDS bridge is present. See on MITO 8M Mini SOM P/N composition

Description

The LVDS port supports the following standards and features:

• Suitable for 60-fps WUXGA 1920 × 1200 Resolution at 18-bpp and 24-bpp Color, 60 fps 1366 × 768 at 18 bpp and 24 bpp
• Output Configurable for Single-Link or Dual-Link LVDS
• LVDS Output Clock Range of 25 MHz to 154 MHz in Dual-Link or Single-Link Modes

Pin mapping

The Pin mapping is described in the Pinout table section

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Peripheral MIPI

The MIPI interfaces available on iMX8M Mini/Nano SoC are following described:

• The Camera Serial Interface (CSI) is a specification of the Mobile Industry Processor Interface (MIPI) Alliance. It defines an interface between a camera and a host processor.
• The Display Serial Interface (DSI) is a specification by the Mobile Industry Processor Interface (MIPI) Alliance aimed at reducing the cost of display controllers in a mobile device. It is commonly targeted at LCD and similar display technologies.

CSI

The CSI interface on MITO 8M Mini/Nano SOM is avaiable on SODIMM connector pinout.

Description

The MIPI CSI port supports the following standards and features:

• Compliant to MIPI CSI2 Specification V1.3 except for C-PHY feature (Board Approved)
• Scalable data lane support, 1 to 4 Data Lanes
• YUV420, YUV420 (Legacy), YUV420 (CSPS), YUV422 of 8-bits and 10-bits RGB565, RGB666, RGB888
• RAW6, RAW7, RAW8, RAW10, RAW12, RAW14

DSI

The DSI interface is internally used on MITO 8M Mini/Nano SOM to generate an LVDS output interface. More details on LVDS section. This interface could be directly routed on the SO-DIMM connector, by removing the MIPI-to-LVDS bridge. Depending on MITO 8M Mini SOM P/N composition

Description

The MIPI CSI port supports the following standards and features:

• Complies to MIPI DSI Standard Specification V1.01r11
• Maximum resolution ranges up to WQHD (1920x1080p60, 24bpp)
• Scalable data lane support, 1 to 4 Data Lanes
• Supports pixel format: 16bpp, 18bpp packed, 18bpp loosely packed (3 byte format), and 24bpp

Pin mapping

The Pin mapping is described in the Pinout table section

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Peripheral SDIOs

The Ultra Secured Digital Host Controller (uSDHC) provides the interface between the host system and the SD/SDIO/MMC cards or devices.

MITO 8M Mini/Nano SOM provides up to three SDIO interface available for an external memory device connection.

The availability of this interface is related to the SOM mounting option:

• on NAND on board version, the NAND interface is internally connected, and the USDHC1, USDHC2 and USDHC3 interface is routed externally the SOM
• on eMMC on board version, the USDHC1 interface is internally connected, and the NAND interface is routed externally the SOM with USDHC2 and USDHC3

See Pin mapping tables for connection details.

Description

The SDIOs interface available on MITO 8M Mini/Nano is based on iMX8M Mini/Nano SoC.

The SDIOs port supports the following standards and features:

• Conforms to the SD Host Controller Standard Specification version 2.0/3.0
• Compatible with the MMC System Specification version 4.2/4.3/4.4/4.41/5.0/5.1
• Compatible with the SD Memory Card Specification version 3.0 and supports the Extended Capacity SD Memory Card
• Compatible with the SDIO Card Specification version 2.0/3.0
• Supports 1-bit/4-bit SD and SDIO modes, and 1-bit/4-bit/8-bit MMC modes
• Card bus clock frequency up to 208 MHz

Pin mapping

The Pin mapping is described in the Pinout table section

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Peripheral SPI

The Enhanced Configurable Serial Peripheral Interface (ECSPI) is a full-duplex, synchronous, four-wire serial communication block.

Description

Three SPI interface are available on MITO 8M Mini/Nano based on iMX8M Mini/Nano SoC.

The SPI port supports the following standards and features:

• Full-duplex synchronous serial interface
• Master/Slave configurable
• Four Chip Select (SS) signals to support multiple peripherals
• Transfer continuation function allows unlimited length data transfers
• 32-bit wide by 64-entry FIFO for both transmit and receive data
• Polarity and phase of the Chip Select (SS) and SPI Clock (SCLK) are configurable
• Direct Memory Access (DMA) support

Pin mapping

The Pin mapping is described in the Pinout table section

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Peripheral I2C

I2C is a two-wire, bidirectional serial bus that provides a simple, efficient method of data exchange, minimizing the interconnection between devices.

This bus is suitable for applications requiring occasional communications over a short distance between many devices.

Description

The three I2C interface available on MITO 8M Mini/Nano is based on iMX8M Mini/Nano SoC and it is designed to be compatible with the PhilipsTM I2C bus protocol.

The iMX8M Mini/Nano SOC has four I2C bus interfaces, but there is some limitation about:

• The I2C1 bus is internally used for PMIC and MIPI to LVDS bridge and it is not externally available

See Pin mapping tables for connection details.

Features

The I2C port supports the following standards and features:

• Compatibility with I2C bus standard
• Standard mode (100 kbits/s) and Fast mode (400 kbits/s) can be achieved
• Multimaster operation
• Software programmability for one of 64 different serial clock frequencies
• Software-selectable acknowledge bit
• Interrupt-driven, byte-by-byte data transfer
• Arbitration-lost interrupt with automatic mode switching from master to slave
• Calling address identification interrupt
• Start and stop signal generation/detection
• Repeated Start signal generation
• Acknowledge bit generation/detection
• Bus-busy detection

Pin mapping

The Pin mapping is described in the Pinout table section

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Peripheral UARTs

Description

The Universal Asynchronous Receiver/Transmitter (UART) interface available on MITO 8M Mini/Nano is based on iMX8M Mini/Nano SoC.

UARTs provides serial communication capability with external devices and support NRZ encoding format, RS485 compatible 9 bit data format and IrDA-compatible infrared slow data rate (SIR) format.

The UART port supports the following standards and features:

• High-speed TIA/EIA-232-F compatible, up to Mbit/s
• Serial IR interface low-speed, IrDA-compatible (up to 115.2 Kbit/s)
• 9-bit or Multidrop mode (RS-485) support (automatic slave address detection)
• 7 or 8 data bits for RS-232 characters, or 9 bit RS-485 format
• 1 or 2 stop bits
• Programmable parity (even, odd, and no parity)
• Hardware flow control support for request to send (RTS_B) and clear to send (CTS_B) signals
• Two independent, 32-entry FIFOs for transmit and receive

Pin mapping

The Pin mapping is described in the Pinout table section

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Peripheral USB

Universal Serial Bus (USB) is an industry standard that establishes specifications for cables and connectors and protocols for connection, communication and power supply (interfacing) between computers, peripherals and other computers.

Description

The USB interface available on MITO 8M Mini/Nano are based on iMX8M Mini/Nano SoC.

The USB controller consists of two independent USB On-The-Go (OTG) controller cores. Each controller core supports UTMI interfaces according to its feature:

• High-Speed/Full-Speed/Low-Speed OTG core
• HS/FS/LS UTMI compliant interface

Each USB OTG controller core can operate in High Speed operation (480 Mbps), Full Speed operation (12 Mbps) and Low Speed operation (1.5 Mbps).

Pin mapping

The Pin mapping is described in the Pinout table section

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Peripheral GPIOs

The GPIO general-purpose input/output peripheral provides dedicated general-purpose pins that can be configured as either inputs or outputs.

Description

When configured as an output, it is possible to write to an internal register to control the state driven on the output pin. When configured as an input, it is possible to detect the state of the input by reading the state of an internal register. In addition, the GPIO peripheral can produce CORE interrupts.

Pin mapping

The Pin mapping is described in the Pinout table section

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Real Time Clock

This chapter describes the technical specifications and features for the RTC component on the MITO 8M Mini/Nano module.

The Real Time Clock available on MITO 8M Mini/Nano is based on iMX8M Mini/Nano SoC.

Features

The MITO 8M Mini/Nano module uses a 32.768kHz dedicated crystal in order to obtain an accurate time base for the RTC.

Important note for RTC during power-off

The Real Time Clock is kept operative through the PMIC_LICELL pin (J.14): the LICELL pin provides for a connection of a coin cell backup battery or a “super” capacitor.

A small capacitor should be placed from LICELL to ground under all circumstances.

For more information about PMIC RTC functionality, please refer to the PF8121 datasheet.

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Peripheral Watchdog

The Watchdog Timer (WDOG) protects against system failures by providing a method by which to escape from unexpected events or programming errors.

Description

By default, the Watchdog Timer of iMX8M Mini/Nano SOC is internally used on MITO 8M Mini/Nano for the CPU-initiated software reset function.

For more details see the reset scheme and control signals section.

Pin mapping

The Pin mapping is described in the Pinout table section

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ADC Voltage Monitor

On MITO 8M Mini/Nano there is an Analog to Digital converter that could be used as a voltage monitor for the PMIC voltage rails.

It is connected to the AMUX output from PMIC. See PMIC PF8121 datasheet for more details.

The ADC component is a Texas Instruments ADS1114:

• 16 bits resolution
• Programmable Data Rate: 8 SPS to 860 SPS
• Low Current Consumption: 150 µA (Continuous-Conversion Mode)

It is connected to the internal I2C1.

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Electrical, Thermal and Mechanical Features

Operational characteristics

Maximum ratings

Parameter	Min	Typ	Max	Unit
Main power supply voltage	0	3.3	3.6	V

Recommended ratings

Parameter	Min	Typ	Max	Unit
Main power supply voltage	3.135	3.3	3.465	V

Power consumption

Providing theoretical maximum power consumption value would be useless for the majority of system designers building their application upon MITO 8M Mini/Nano module. Practically speaking, these figures would be of no help when it comes to size power supply unit or to perform thermal design of real systems.

Instead, several configurations have been tested in order to provide figures that are measured on real-world use cases.

Please note that MITO 8M Mini/Nano platform is so flexible that it is virtually impossible to test for all possible configurations and applications on the market. The use cases here presented should cover most of real-world scenarios. However actual customer's application might require more power than values reported here or customer's use case may be differ significantly with respect to the ones here considered.

Therefore, application-specific requirements have always to be taken into consideration in order to size power supply unit and to implement thermal management properly.

Use cases results

Measurements have been performed on the MITO 8M Mini/Nano SOM under test is equipped with:

• Test Bed: standard Evaluation Kit with DMMA23000I0R
• working temperature: +85°C

Checkpoint	Power (mW) (SOM)	Power (mW) (Full testbed)
IDLE	2260	6050
Stress App test (*) uSD continuously copied eMMC continuously copied iperf ETH0	3633 (average)	7170(average)

(*) Stressful Application Test: https://github.com/stressapptest/stressapptest

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Thermal management

The MITO 8M Mini/Nano SOM is designed to support the maximum available temperature range declared by the manufacturer.

The customer shall define and conduct a reasonable number of tests and verification in order to qualify the DUT capabilities to manage the heat dissipation.

Any heatsink, fan etc shall be defined case by case.

DAVE Embedded Systems' team is available for any additional information, please contact sales@dave.eu.

Temperature sensor on SOC

The internal temperature sensor of iMX8M Mini/Nano SOC has some limitations regarding the operative range (from 10 to 105°C) and the precision (±5 accuracy).

If the operative temperature is a crucial parameter on the system where MITO 8M Mini/Nano is integrated, we suggest adding one or more temperature sensors on the carrier board in order to overcome these limitations.

In the following Software thermal protection chapter, the implementation of reading and trip points management are referred at the internal SOC temperature sensor.

Heatsink suggestion

The MITO 8M Mini/Nano SOM is designed with four holes that allow to mount a heatsink directly on the CPU IC.

See Mito 8M Mini/Nano Board Layout section for more details.

SOM Thermography

The following image is taken in stress tests conditions (see this section) without any heatsinkin order to highlight the hot spots on this board. The hottests points here are:

• the CPU
• the PMIC
• the Ethernet PHY (iperf test was enable during this test)

Depending on your application it is may needed to dissipate heat not only from CPU but also other areas (the thermal analysis is important in conjunction with the temperature range of each component which may be 125°C or 150°C). Depending on the application running, this platform can be suitable for fanless approach.

Software thermal protection

In DESK-MX8M-L, two software thermal protection mechanisms are implemented. Both are based on the processor's temperature sensor. It is worth remembering that maximum junction temperature (also denoted as Tj in the rest of the document) is:

• 95°C for Consumer parts
• 105°C for Industrial parts

U-Boot

At U-Boot level, automatic boot procedure is halted until Tj is greater than (following temperatures might seem excessively low but they take into account the intrinsic poor precision of the temperature sensor to provide a reasonable safe margin):

• 85°C for Consumer parts
• 95°C for Industrial parts

Linux kernel

At Linux level, a more sophisticated protection mechanism is implemented. Please refer to the following sections for more details.

The default temperature thresholds depend on the silicon grade, as follows:

• for Consumer parts
  • passive threshold:85°C
  • critical threshold: 90°C

• for Industrial parts
  • passive threshold: 95°C
  • critical threshold: 100°C

Practically speaking, for DESK-MX8-L this mechanism makes use of two different thresholds, denoted as trip_point0 (also known as passive threshold) and trip_point1 (also known as critical threshold).

When Tj reaches trip_point0, Linux kernel scales down processor frequency.

If Tj reaches trip_point1, a complete shutdown is triggered:

thermal thermal_zone0: critical temperature reached(95 C),shutting down

To resume the CPU from the shutdown, the CPU_ONOFF signal must be externally managed. Please contact sales@dave.eu for any additional information.

By default, temperature thresholds are set up as follows:

• trip_point0: 85°C
• trip_point1: 95°C.

Trip point thresholds can be accessed via sysfs interface from user space. The following example shows how to read the values of the trip points:

root@mito:~# cat /sys/devices/virtual/thermal/thermal_zone0/trip_point_0_temp
85000
root@mito:~# cat /sys/devices/virtual/thermal/thermal_zone0/trip_point_1_temp
950000

This example shows how to set trip points 0 and 1 to 95°C and 100°C respectively:

echo 95000 > /sys/class/thermal/thermal_zone0/trip_point_0_temp
echo 100000 > /sys/class/thermal/thermal_zone0/trip_point_1_temp

Please note that:

• it is possible to set up trip points greater than the maximum junction temperature indicated by manufacturer datasheet;
• exceeding maximum junction temperature indicated by manufacturer datasheet may cause permanent damage.

To read current processor temperature please issue this command (reported temperature is 36.676°C in the example):

root@mito:~# cat /sys/class/thermal/thermal_zone0/temp
36676

For more details about this functionality, please refer to Documentation/thermal/sysfs-api.txt in the kernel sources.

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Mechanical specifications

This chapter describes the mechanical characteristics of the MITO 8M Mini/Nano module.

Board Layout

The following figure shows the physical dimensions of the MITO 8M Mini/Nano module:

MITO8M Mini/Nano TOP view

MITO8M Mini/Nano side view

MITO8M Mini/Nano heat sink holes detail view

Connectors

The following figure shows the MITO 8M Mini/Nano connector layout:

MITO8M Mini/Nano connectors TOP view

MITO8M Mini/Nano connectors BOTTOM view

CAD drawings

• DXF (2D): CS103119.dxf
• STEP (3D): CS103119.step

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