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Embedian SMARC T335x User Manual

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Embedian, Inc.
SMARC T335x Computer on Module User's Manual v.1.2
SMARC Computer on Module
TI Sitara AM335x Cortex A8
Parallel LCD 18/24 bits
3 x COM Ports
1 x SDHC
1 x USB Host 2.0, 1 x USB OTG
2 x 10/100Mbps Ethernet
CAN Bus, 2 x SPIs, 3 x I2C
SMARC T335x
1

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  • Page 1 Parallel LCD 18/24 bits 3 x COM Ports 1 x SDHC 1 x USB Host 2.0, 1 x USB OTG 2 x 10/100Mbps Ethernet CAN Bus, 2 x SPIs, 3 x I2C SMARC T335x SMARC T335x Computer on Module User’s Manual v.1.2...
  • Page 2 Embedian, Inc. SMARC T335x Computer on Module User’s Manual v.1.2...
  • Page 3 0x30 2014/4/17 Update for hardware revision 00B0 1. SPI_D0 and SPI_D1 interchanged 2. Remove USB Drvvbus pull-up resistors 3. Interchange GPIO1 and LCD_BKLT_PWM line 4. Change the eeprom serial number naming rule SMARC T335x Computer on Module User’s Manual v.1.2...
  • Page 4 This EMBEDIAN product is warranted against defects in material and workmanship for the warranty period from the date of shipment. During the warranty period, EMBEDIAN will at its discretion, decide to repair or replace defective products. Within the warranty period, the repair of products is free of charge as long as warranty conditions are observed.
  • Page 5 Embedian, Inc. EMBEDIAN will not be responsible for any defects or damages to other products not supplied by EMBEDIAN that are caused by a faulty EMBEDIAN product. Technical Support Technicians and engineers from EMBEDIAN and/or its subsidiaries and official distributors are available for technical support. We are committed to making our product easy to use and will help you use our products in your systems.

  • Page 6: Table Of Contents

      CHAPTER 3 CONNECTOR PINOUT ....................61   3.1 SMARC T335X CONNECTOR PIN MAPPING................61   CHAPTER 4 HANDSHAKING BETWEEN SMARC T335X MODULE AND CARRIER ....... 86   4.1 SMARC T335X MODULE POWER ....................86   4.2 TERMINATIONS ..........................90  ...
  • Page 7 Filenames, pathnames, and code examples. Embedian Information Document Updates Please always check the product specific section on the Embedian support website at www.embedian.com/ for the most current revision of this document. Contact Information For more information about your Embedian products, or for customer service and technical support, contact Embedian directly.
  • Page 8 Embedian, Inc. and related documentation for additional information. SMARC T335x Computer on Module User’s Manual v.1.2...

  • Page 9: Chapter 1 Introduction

    This Chapter gives background information on the SMARC T335X Section include：  Features and Functionality  Module Variant  Block diagram  Software Support / Hardware Abstraction  Module Variant  Document and Standard References SMARC T335x Computer on Module User’s Manual v.1.2...
  • Page 10 1.1 Features and Functionality The SMARC T335X module is based on the AM335x processor from Texas Instruments. This processor offers a high number of interfaces. Most of these interfaces are multiplexed and are not available simultaneously. The module has the following features: ...

  • Page 11: Module Variant

    3.3V module IO support 1.2 Module Variant The SMARC T335X module is available with various options based on processors in this family from Texas Instruments. For example, if people would like to use Sitara AM3354 from Texas Instruments, you can order SMARC T3354.

  • Page 12: Block Diagram

    The following diagram illustrates the system organization of the SMARC T335X. Arrows indicate direction of control and not necessarily signal flow. Figure 1: SMARC T335X Block Diagram Details for this diagram will be explained in the following chapters. SMARC T335x Computer on Module User’s Manual v.1.2...

  • Page 13: Software Support / Hardware Abstraction

    1.4 Software Support / Hardware Abstraction The Embedian SMARC T335X Module is supported by Embedian BSPs (Board Support Package). The first SMARC T335X BSP targets Linux (Ubuntu 12.04 LTS) and Android support. BSPs for other operating systems are planned. Check with your Embedian contact for the latest BSPs.
  • Page 14 1.5.3. Embedian Documents The following documents are listed for reference. The Module schematic is not usually available outside of Embedian, without special permission. The other schematics may be available, under NDA or otherwise. Contact your Embedian representative for more information. The SMARC T335x Evaluation Carrier Board Schematic is particularly useful as an example of the implementation of various interfaces on a Carrier board.
  • Page 15 Embedian Android BSP for SMARC T335X Module  Embedian Linux BSP User’s Guide  Embedian Android BSP User’s Guide 1.5.8. TI Design Network  Beaglebone  Adeneo Embedded (Windows Embedded Compact 7)  Nucleus  SMARC T335x Computer on Module User’s Manual v.1.2...

  • Page 16: Chapter 2 Specifications

    Embedian, Inc. Specifications This Chapter provides SMARC T335X specifications. Section include：  SMARC T335X General Functions  SMARC T335X Debug  Mechanical Specifications  Electrical Specification  Environment Specification SMARC T335x Computer on Module User’s Manual v.1.2...
  • Page 17 Embedian, Inc. Chapter 2 Specifications 2.1 SMARC T335X General Functions 2.1.1. SMARC T335X Feature Set This section lists the complete feature set supported by the SMARC T335X module. SMARC Feature SMARC SMARC T335X SMARC T335X Specification Specification Feature Support Feature Support...
  • Page 18 Support I/O Voltage (3.3V) Level Support 2.1.2. Form Factor The SMARC T335X module complies with the SMARC General Specification module size requirements in an 82mm x 50mm form factor. 2.1.3. CPU The SMARC T335X implements TI’s AM335x ARM processor. ...
  • Page 19 2.1.5. Onboard Storage The SMARC T335X module supports a 4GB eMMC flash memory device, 4MB SPI NOR flash and a 32Kb I2C serial EEPROM on the Module I2C_PM (I2C0) bus. The device used is an On Semiconductor 24C32 equivalent. The Module serial EEPROM is intended to retain Module parameter information, including a module serial number.
  • Page 20 LCD_D[23:16]; Blue is LCD_D[15:8] and Green is LCD_D[7:0]. For 24 bit implementations, all bits are used. For 18 bit implementations, in SMARC, the least significant bits (Red LCD_D[17:16], Green LCD_D[9:8], Blue LCD_D[1:0]) are dropped. SMARC T335x Computer on Module User’s Manual v.1.2...
  • Page 21 LCD_D6  B6  Mode0 LCD_DATA13  LCD_D5  LCD_D5  B5  Mode0 LCD_DATA12  LCD_D4  LCD_D4  B4  Mode0 LCD_DATA11  LCD_D3  LCD_D3  B3  Mode1 LCD_DATA17  LCD_D2  LCD_D2  B2  Mode1 LCD_DATA20  LCD_D1  LCD_D1  B1  Mode1 LCD_DATA23  LCD_D0 (LSB)  LCD_D0  B0  SMARC T335x Computer on Module User’s Manual v.1.2...
  • Page 22 For instance, to connect an 18 bit display, R0, R1, G0, G1, B0 and B1 will remain unused, and R2, G2 and B2 become the LSBs for this configuration. SMARC T335x Computer on Module User’s Manual v.1.2...
  • Page 23 Embedian, Inc. 2.1.8. USB Interface The Embedian SMARC T335X module supports two USB ports (USB 0:1). Per the SMARC specification, the module supports a USB “On-The-Go” (OTG) port capable of functioning either as a client or host device, on the SMARC USB0 port.
  • Page 24 10k pull up resistors on the Module, but AM335X Sitara AM335X does not require pull up on module. The SMARC T335X Module USB power enable and over current indication logic implementation is shown in the following block diagram. There are no pull-up resistors on the Module on the SMARC USBx_EN_OC# (drvvbus) lines.
  • Page 25 Over-Current pin (OC#) must be open drain, active low (these are commonly available). No pull-up is required on the USB power switch Enable or OC# line; they are tied together on the Carrier and fed to the Module USBx_EN_OC# pin. SMARC T335x Computer on Module User’s Manual v.1.2...
  • Page 26 This processor can be configured as one Gigabit LAN (MAC) or two 10/100Mpbs LAN (MAC). The SMARC T335X module supports two fast Ethernet (10/100Mbps) interfaces. Two fast Ethernet controller interfaces are...
  • Page 27 I/O voltage that is compliant with the IEEE 802.3-2005 standards. The LAN8720A supports communication with an Ethernet MAC via a standard RMII interface. This is diagrammed below. Figure 5: Fast Ethernet Connection from Sitara AM335x to SMSC LAN8720A SMARC T335x Computer on Module User’s Manual v.1.2...
  • Page 28 Mode1 present on TXD[1:0]. RMII1_TXD0  TXD0  RMII1_TXD0  Mode1 The MAC transmits data to the transceiver using this signal. RMII1_TXD1  TXD1  RMII1_TXD1  Mode1 The MAC transmits data to the transceiver using this signal. SMARC T335x Computer on Module User’s Manual v.1.2...
  • Page 29 This signal is asserted to indicate that an error was detected somewhere in the frame presently being transferred from the transceiver. Indicates that valid transmission data is Mode3 RMII2_TXEN  TXEN  RMII2_TXEN  present on TXD[1:0]. SMARC T335x Computer on Module User’s Manual v.1.2...
  • Page 30 GbE port definition in SMARC specification. The pin-outs of fast Ethernet (10/100Mbps) are a subset of GbE that defines in SMARC spec. The path from LAN8720A to the golden finger edge connector is show in the following figure. SMARC T335x Computer on Module User’s Manual v.1.2...
  • Page 31 Embedian, Inc. Figure 6: Fast Ethernet Connection from SMSC LAN8720A to golden finger edge connector SMARC T335x Computer on Module User’s Manual v.1.2...
  • Page 32 Blinks on Activity Could be able to sink 24mA or more Carrier LED current GbE_LINK100#  GBE_LINK100#  LED2/nINTSEL  Link Speed Indication LED for 100Mbps Could be able to sink 24mA or more Carrier LED current SMARC T335x Computer on Module User’s Manual v.1.2...
  • Page 33 Carrier LED current Caution: Due to SMARC T335x support Fast Ethernet instead of Gigabit LAN, GBE_MDI2 (+ and -) and GBE_MDI3 (+ and -) are not connected to the golden finger connector. SMARC T335x Computer on Module User’s Manual v.1.2...
  • Page 34 VDDA RXP (pin 23)  49.9ohm, 1.0% pull-up resistor to VDDA RXN (pin 22)  49.9ohm, 1.0% pull-up resistor to VDDA LED1/REGOFF  10kohm, 1.0% pull-down (pin 3)  resistor to ground. LED2/nINTSEL  10kohm,1.0% pull-down (pin 2)  resistor to ground SMARC T335x Computer on Module User’s Manual v.1.2...
  • Page 35 Sitara AM335x CPU is configured to support two MMC controllers. One is used for internal eMMC support, and the other is used for external SDHC/SDIO interface. The SMARC T335X module supports a 4bit SDIO interface, per the SMARC specification. The SDIO interface uses 3.3V signaling, per the SMARC spec and for compatibility with commonly available SDIO cards.
  • Page 36 Embedian, Inc. 2.1.11. SPI Interface The SMARC T335X module supports two AM335x SPI interfaces that are available off-Module for general purpose use. Each SPI channel has two chip-selects that can connect two SPI slave devices on each channel. Every device will share the "SPI_DIN", "SPI_DO" and "SPI_CK" pins, but each device will have its own chip select pin.
  • Page 37 SPI1 Master Clock output  SPI1_D0  SPI1_DIN  SPI1_MISO  Mode3 SPI1 Master Data input (input to CPU, output from SPI device) Mode3 SPI1_D1  SDIO_DO  SPI1_MOSI  SPI1 Master Data output (output from CPU, input to SPI device) SMARC T335x Computer on Module User’s Manual v.1.2...
  • Page 38 2.1.12. I2S Interface The SMARC T335X module supports one I2S interface. I2S is originated from Sitara AM335x McASP interface. I2S interface signals are exposed on the SMARC T335X golden finger edge connector as shown below: TI AM335x CPU SMARC T335X...
  • Page 39 Embedian, Inc. 2.1.13. Asynchronous Serial Port The SMARC T335X module supports three UARTs (SER0:1, 3). UART SER0 supports flow control signals (RTS, CTS). UART SER1 and SER3 do not support flow control. When working with software, SER 3 is used for AM335x CPU debugging console port.
  • Page 40 I2C_GP I2C1 General purpose 3.3V LCD display I2C_LCD I2C2 support General Purpose 3.3V (for parallel and LVDS LCD) Note: The 2.2k pull-up resistors for I2C_SCL and I2C_SDA signals are on module. SMARC T335x Computer on Module User’s Manual v.1.2...
  • Page 41 I2C bus clock Mode3 I2C1_SDA  I2C_GP_DAT  I2C_GP_DAT  General purpose I2C bus data  LCD_I2C I2C2_SCL  I2C_LCD_CK  I2C_LCD_CK  Mode3 S139 LCD display I2C bus clock I2C2_SDA  I2C_LCD_DAT  I2C_LCD_DAT  Mode3 S140 LCD display I2C bus data  SMARC T335x Computer on Module User’s Manual v.1.2...
  • Page 42 Note: The voltage level of I2C_PM on SMARC T335x is 1.8V. In Embedian Carrier design, the voltage level of I2C_PM will pull up to 3.3V (I2C_PM_3V3) on Carrier. Two more I2C devices are on I2C_PM_3V3 bus in SMART-BEE evaluation carrier board.
  • Page 43 The Controller Area Network (CAN) is a serial communications protocol which efficiently supports distributed real-time control with a high level of security. The SMARC T335X module supports a CAN bus interface. CAN interface signals are exposed on the SMARC golden finger edge...
  • Page 44 Embedian, Inc. 2.1.16. GPIOs The SMARC T335X module supports 12 GPIOs, per the SMARC specification. Specific alternate functions are assigned to some GPIOs such as PWM / Tachometer capability, Camera support, CAN Error Signaling and HD Audio reset. All pins are capable of bi-directional operation. A default direction of operation is assigned, with half of them (GPIO0 –...
  • Page 45 (stylus or finger). The change in the resistance ratio marks the location on the touchscreen. 4-wire TSC has been implemented on SMARC T335X module. TSC signals are exposed on the SMARC golden finger edge connector as shown below: TI AM335x CPU...
  • Page 46 Embedian, Inc. 2.1.18. Watchdog Timer Interface Sitara AM335x features an internal WDT. Embedian’s Linux kernel enables the internal AM335x WDT and makes this functionality available to users through the standard Linux Watchdog API. A description of the API is available following the link below: http://www.kernel.org/doc/Documentation/watchdog/watchdog-api.txt...
  • Page 47 Embedian, Inc. 2.1.19. JTAG Figure 8 shows the SMARC T335x JTAG connectors location and pin out. Figure 8: JTAG Connector Location and Pinout JTAG functions for CPU debug and test are implemented on separate small form factor connector (CN3: JST SM10B-SRSS-TB, 1mm pitch R/A SMD Header).
  • Page 48 Ground  Ground 2.1.20. Boot ID EEPROM The SMARC T335x module includes an I2C serial EEPROM available on the I2C_PM bus. An On Semiconductor 24C32 or equivalent EEPROM is used in the module. The device operates at 1.8V. The Module serial...
  • Page 49 T335X supported, the following codes are Option  used: ASCII = “SMARCT33” = default configuration Remaining 24 bytes are reserved 32720  Available  Available space for other non-volatile codes/data After 00A0 version, the EEPROM will be write-protected. SMARC T335x Computer on Module User’s Manual v.1.2...

  • Page 50: Smarc T335X Debug

    3 serial ports, SER3 is set as the serial debug port use for Sitara AM335x. SER3 is exposed (along with all other serial ports available on the module) in the SMARC T335X Evaluation Carrier. The default baud rate setting is 115,200 8N1.
  • Page 51 Embedian, Inc. 2.3.4. Mechanical Drawings The mechanical information is shown in Figure 9: SMARC T335X Mechanical Drawings (Top View) and Figure 10: SMARC T335X Mechanical Drawings (Bottom View)) Figure 9. SMARC T335X Mechanical Drawings (Top View) SMARC T335x Computer on Module User’s Manual v.1.2...
  • Page 52 Embedian, Inc. Figure 10. SMARC T335X Mechanical Drawings (Bottom View) SMARC T335x Computer on Module User’s Manual v.1.2...
  • Page 53 Figure 11: SMARC T335X Top side components. Figure 11. SMARC T335X Top Side Components Bottom side major component (IC and Connector) information is shown in Figure 12: SMARC T335X Bottom side components. SMARC T335x Computer on Module User’s Manual v.1.2...
  • Page 54 Embedian, Inc. Figure 12. SMARC T335X Bottom Side Components SMARC T335x height information from Carrier board Top side to tallest Module component is shown in Figure 13: SMARC T335x Minimum “Z” Height: Figure 13. SMARC T335x Minimum “Z” Height The SMARC connector board-to-board stack heights that are available may result in the use of non-standard spacer lengths.
  • Page 55 MTBF values. 2.3.6. Module Assembly Hardware The SMARC T335X module is attached to the carrier with four M2.5 screws. A 4mm length screw is usually used. The attachment holes are located on the corners of the module. Attachment holes have a 6mm diameter pad, 2.7...

  • Page 56: Electrical Specifications

    Embedian, Inc. 2.4 Electrical Specifications 2.4.1. Supply Voltage The SMARC T335X module operates over an input voltage range of 3.35V to 5.25V. Power is provided from the carrier through 10 power pins as defined by the SMARC specification. Caution! The SMARC specification states that the input voltage range should extend down to 3.0V.
  • Page 57 2.4.5. Power Consumption Power consumption is highly dependent on the individual user’s application; however, this section focuses on typical SMARC T335X application-usage case scenarios and the environment settings that were used to perform such power measurements. Power figures are given in the table below for the Module power consumption.
  • Page 58 VDDSHV4 1.8 / 3.3 V +/-5% 0.01 3.292 0.03 0.11 VDDSHV5 1.8 / 3.3 V +/-5% 0.93 3.323 3.89 12.92 VDDSHV6 1.8 / 3.3 V +/-5% 1.35 3.322 5.64 18.73 Total 486.51 SMARC T335x Computer on Module User’s Manual v.1.2...

  • Page 59: Environmental Specifications

    Embedian, Inc. 2.5 Environmental Specifications 2.5.1. Operating Temperature The SMARC T335x module operates from 0°C to 60°C air temperature, without a passive heat sink arrangement. Industrial temperature (-40 C is also available with different part number SMARC T335x-I). 2.5.2. Humidity Operating: 10% to 90% RH (non-condensing).

  • Page 60: Chapter 3 Connector Pinout

    Embedian, Inc. Connector PinOut This Chapter gives detail pinout of SMARC T335X golden finger edge connector. Section include：  SMARC T335X Connector Pin Mapping SMARC T335x Computer on Module User’s Manual v.1.2...
  • Page 61 The Secondary (Bottom) side faces the Carrier board when a normal or standard Carrier connector is used. The SMARC T335x module pins are deliberately numbered as P1 – P156 and S1 – S158 for clarity and to differentiate the SMARC Module from MXM3 graphics modules, which use the same connector but use the pins for very different functions.
  • Page 62 Embedian, Inc. Figure 15: SMARC T335X edge finger secondary pins The next tables describe each pin, its properties, and its use on the module and development board. The “SMARC Edge Finger” column shows the connection of the signals defined in the SMARC specification. The “Sitara AM335x CPU” column shows the connection of the CPU signals on the module.
  • Page 63 Not used PCAM_D4  CSI1_D1‐ /  Not used PCAM_D5  GND  Ground CSI1_D2+ /  Not used PCAM_D6  CSI1_D2‐ /  Not used PCAM_D7  GND  Ground CSI1_D3+ /  Not used PCAM_D8  CSI1_D3‐ /  Not used PCAM_D9  GND  Ground GbE_MDI3‐  Not used SMARC T335x Computer on Module User’s Manual v.1.2...
  • Page 64 Transmit/Receive Positive Channel 1 GbE1_CTREF  SMSC LAN8720A Center tap reference voltage for GBE Carrier board Ethernet magnetic GbE_MDI0‐  SMSC LAN8720A: Differential Transmit/Receive Negative Channel GbE_MDI0+  SMSC LAN8720A: Differential Transmit/Receive Positive Channel 0 SMARC T335x Computer on Module User’s Manual v.1.2...
  • Page 65 SPI0 Master Clock output SPI0_DIN  SPI0_D0  Mode0 SPI0 Master Data input (input to CPU, output from SPI device) SPI0_DO  Mode0 SPI0_D1  SPI0 Master Data output (output from CPU, input to SPI device) SMARC T335x Computer on Module User’s Manual v.1.2...
  • Page 66 CPU, output from SPI device) SPI1_DO  SPI1_D1  Mode3 SPI1 Master Data output (output from CPU, input to SPI device) GND  Ground USB0+  Mode0 USB0_DP  Differential USB0 data USB0‐  USB0_DM  Mode0 Differential USB0 data SMARC T335x Computer on Module User’s Manual v.1.2...
  • Page 67 Pulled low by Module OD driver to disable USB0 power Pulled low by Carrier OD driver to indicate over-current situation If this signal is used, a pull-up is required on the Carrier SMARC T335x Computer on Module User’s Manual v.1.2...
  • Page 68 Not used GND  Ground PCIE_C_REFCK+  Not used PCIE_C_REFCK‐  Not used GND  Ground PCIE_A_REFCK+  Not used PCIE_A_REFCK‐  Not used GND  PCIE_A_RX+  Not used PCIE_A_RX‐  Not used GND  Ground PCIE_A_TX+  Not used PCIE_A_TX‐  Not used SMARC T335x Computer on Module User’s Manual v.1.2...
  • Page 69 Mode7 Camera 0 Power Enable, CAM0_PWR#  active low output GPIO1 /  GPIO2[5]  P109 Mode7 Camera 1 Power Enable, CAM1_PWR#  active low output  P110 GPIO2 /  Mode7 GPIO1[25]  Camera 0 Reset, active CAM0_RST#  low output  SMARC T335x Computer on Module User’s Manual v.1.2...
  • Page 70 Mode0 Power management I2C bus clock I2C_PM_DAT  I2C0_SDA  P122 Mode0 Power management I2C bus data  P123 BOOT_SEL0#  SYSBOOT and Line De-multiplexer Logic Pulled up on Module. Driven by OD part on Carrier. SMARC T335x Computer on Module User’s Manual v.1.2...
  • Page 71 PMIC TPS65217C through Level Translator, Reset input from Carrier board. Carrier drives low to force a Module reset, floats the line otherwise Pulled up on Module. Driven by OD part on Carrier. SMARC T335x Computer on Module User’s Manual v.1.2...
  • Page 72 P134 Mode1 Asynchronous serial port data out SER1_RX  UART2_RXD  P135 Mode1 Asynchronous serial port data in  SER2_TX  P136 Not used P137 SER2_RX  Not used P138 SER2_RTS#  Not used SER2_CTS#  P139 Not used SMARC T335x Computer on Module User’s Manual v.1.2...
  • Page 73 VDD_IN  P149 Power in P150 VDD_IN  Power in VDD_IN  P151 Power in VDD_IN  P152 Power in P153 VDD_IN  Power in P154 VDD_IN  Power in VDD_IN  P155 Power in VDD_IN  P156 Power in SMARC T335x Computer on Module User’s Manual v.1.2...
  • Page 74 Not used PCAM_D12  CSI0_D0‐ /  Not used PCAM_D13  GND  Ground CSI0_D1+ /  Not used PCAM_D14  CSI0_D1‐ /  Not used PCAM_D15  GND  Ground AFB0_OUT  SMSC LAN8720A Center tap reference voltage for GBE1 Carrier board Ethernet magnetic SMARC T335x Computer on Module User’s Manual v.1.2...
  • Page 75 GBE_1_LINK1000#: Not used GND  Ground SDMMC_D0  Not used SDMMC_D1  Not used SDMMC_D2  Not used SDMMC_D3  Not used SDMMC_D4  Not used SDMMC_D5  Not used SDMMC_D6  Not used SDMMC_D7  Not used GND  Not used SMARC T335x Computer on Module User’s Manual v.1.2...
  • Page 76 Ground I2C_GP_CK  Mode3 I2C1_SCL  General purpose I2C bus clock I2C_GP_DAT  I2C1_SDA  Mode3 General purpose I2C bus data  I2S2_LRCK  Not used I2S2_SDOUT  Not used I2S2_SDIN  Not used I2S2_CK  Not used SATA_ACT#  Not used SMARC T335x Computer on Module User’s Manual v.1.2...
  • Page 77 Not used SPDIF_OUT  Not used SPDIF_IN  Not used GND  Ground AFB_DIFF0+  GBE1_MDI0+: Bi-directional transmit/receive pair 0 to magnetics (Media Dependent Interface) for AFB 2nd GBE, SMSC LAN8720A: Differential Transmit/Receive Positive Channel 0 SMARC T335x Computer on Module User’s Manual v.1.2...
  • Page 78 Differential Transmit/Receive Positive Channel 1 AFB_DIFF1‐  GBE1_MDI1-: Bi-directional transmit/receive pair 1 to magnetics (Media Dependent Interface) for AFB 2nd GBE, SMSC LAN8720A: Differential Transmit/Receive Negative Channel GND  Ground AFB_DIFF2+  GBE1_MDI2+: Not used SMARC T335x Computer on Module User’s Manual v.1.2...
  • Page 79 PCIE_C_RX‐  Not used GND  Ground PCIE_C_TX+  Not used PCIE_C_TX‐  Not used GND  Ground PCIE_B_REFCK+  Not used PCIE_B_REFCK‐  Not used GND  Ground PCIE_B_RX+  Not used PCIE_B_RX‐  Not used GND  Ground PCIE_B_TX+  Not used SMARC T335x Computer on Module User’s Manual v.1.2...
  • Page 80 S105 Mode0 implementations leave the two LS S106 LCD_D12  Mode0 LCD_DATA7  bits (D8, D9) not connected LCD_D13  LCD_DATA8  S107 Mode0 LCD_D14  LCD_DATA9  S108 Mode0 S109 LCD_D15  Mode0 LCD_DATA10  GND    S110 Ground SMARC T335x Computer on Module User’s Manual v.1.2...
  • Page 81 LCD_PCK  LCD_PCLK  S123 Mode0 Pixel clock - display data transitions on the positive clock edge S124 GND  Ground S125 LVDS0+  Not used LVDS0‐  S126 Not used SMARC T335x Computer on Module User’s Manual v.1.2...
  • Page 82 LCD display I2C bus data  S141 LCD_BKLT_PWM  Mode0 ecap0_in_pwm0 Display backlight _out  PWM control LCD_DUAL_PCK  Not used S142 GND  S143 Ground S144 RSVD / EDP_HPD  Not used S145 WDT_TIME_OUT#  Mode2 TIMER4 Watchdog-Timer Output PCIE_WAKE#  Not used S146 SMARC T335x Computer on Module User’s Manual v.1.2...
  • Page 83 Carrier. Pulled up on Module. Driven by OD part on Carrier. CHARGING#  S151 Reserved CHARGER_PRSNT#  S152 Reserved CARRIER_STBY#  S153 Reserved SMARC T335x Computer on Module User’s Manual v.1.2...
  • Page 84 3.3V I/O on module Note: Due to the insufficient IO pin number of Sitara AM335x, the reserved pins are multiplexed with RMII2 related pins and default will be configured as RMII2. SMARC T335x Computer on Module User’s Manual v.1.2...
  • Page 85 Embedian, Inc. Handshaking between SMARC Module and Carrier This Chapter points out the handshaking rule between SMARC module and carrier. Section include：  SMARC T335X Module Power  Terminations  Boot Select SMARC T335x Computer on Module User’s Manual v.1.2...

  • Page 86: Chapter 4 Handshaking Between Smarc T335X Module And Carrier

    5.25V. This voltage is brought in on the VDD_IN pins and returned through the numerous GND pins on the connector. The SMARC specification defines the input voltage range should extend down to 3.0V. The SMARC T335X lower limit is determined by a non-volatile register setting in the TI PMIC used and is set 3.35V by default.
  • Page 87 VDD_IO_SEL# pin directly to GND. If the Carrier supports only 3.3V like the case here, Carriers will float the signal for 3.3V. SMARC T335x will not power up if T335x senses a 1.8V VDD_IO Carrier on the VDD_IO_SEL# (due to the Carrier pulling the line down) and the Module supports only 3.3V I/O.
  • Page 88 The Carrier Circuits domain includes “everything else” (and does not include items from the Battery Charger and Module domain, even though they may be mounted on the Carrier). This is illustrated in the figure below. SMARC T335x Computer on Module User’s Manual v.1.2...
  • Page 89 Embedian, Inc. Figure 16 System Power Domains SMARC T335x Computer on Module User’s Manual v.1.2...

  • Page 90: Terminations

    100k pull-up to VIN VIN_PWR_BAD#  100k pull-up to VIN TXP (pin 21  49.9ohm, 1.0% pull-up of LAN8720A)  resistor to VDDA (created from +3.3V through a ferrite bead) TXN (pin 22  49.9ohm, 1.0% pull-up of LAN8720A)  resistor to VDDA SMARC T335x Computer on Module User’s Manual v.1.2...
  • Page 91 49.9ohm, 1.0% pull-up of  LAN  8720A)  resistor to VDDA LED1/REGOFF  10kohm, 1.0% pull-down (pin 3)  resistor to ground. LED2/nINTSEL  10kohm,1.0% pull-down (pin 2)  resistor to ground All other  Weak (~47K) Module  termination to inactive state inputs  SMARC T335x Computer on Module User’s Manual v.1.2...
  • Page 92 LED with the anode tied to Carrier 3.3V, is typical. LVDS LCD  100 ohm resistive termination across the differential pairs at the endpoint of the signal path, usually on the display assembly SMARC T335x Computer on Module User’s Manual v.1.2...

  • Page 93: Boot Device Selection

    Module pin Not Connected (“Float” in the table below) or shall pull the pin to GND, per the table below. Carrier Connection Boot Source BOOT_SEL2# BOOT_SEL1# BOOT_SEL0# Float Carrier SD Card Float Float Module eMMC Flash Float Float Carrier SPI SMARC T335x Computer on Module User’s Manual v.1.2...

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